1. A battery has an emf of 12.9 volts and supplies a current of 3.5 A. What is the resistance of the circuit?

(a) 3.5
(b) 16.4
(c) 3.69
(d) 45.15
2. Sign convention used for potential is:
(a) Rise in potential is negative
(b) rise in potential is zero
(c) rise in potential is equal to fall in potential
(d) rise in potential is positive
3. If the above circuit 3, the potential of E
2
is
Figure 3
(a) 0V
(b) 4V
(c) 2V
(d) 1V
4. Four cells, each of emf 1.5v and internal resistance 0.5 are connected in parallel across an external resistance of
2.5. What is the current supplied by each cell?
(a) 0.1427
(b) 2
(c) 0.515
(d) 0.634
5. The main factors which determine the inductive reactance are
(a) inductance and applied emf
(b) frequency and current
(c) inductance and frequency
(d) frequency and induced emf
6. One sine wave has a positive peak at 75
0
, another has a positive peak at 100
0
. How much in each sine wave shifted
in phase from 0
0
reference.
(a) 15
0
, 15
0
(b) 10
0
, 10
0
(c) 100
0
100
0
(d) 15
0
, 10
0
7. Find the maximum value of the alternating current I = 4.2 sin (5000t + 45
0
)A
(a) 4.02 A
(b) 4.2 A
(c) 2.97 A
(d) 0.42 A
8. For series RC circuit, the relation between voltage and current is
(a) voltage leads the current by
(b) voltage lags the current by
(c) voltage leads by
(d) voltage is equal to currents
9. In the circuit 9 shown, Power consumed by 2 resistor is
Figure 9
(a) 0.325 W
(b) 1.512W
(c) 3.750
(d) 0.0375
10. In a balanced Delta connection, I
Ph
=
(a) I
L
/

3
(b) I
L
(c)

2I
L
(d)

3I
L
11. The armature of a 8-pole d.c generator has 960 conductors and runs at 400rpm. The ux per pole is 40m Wb.
Calculate the induced emf if the armature is lap wound?
(a) 250V
(b) 256V
(c) 300V
(d) 200V
12. A 4 pole shunt generator with lap-connected armature supplies a load of 200 A at 100 V. Shunt eld resistance is
50 ohms, and armature resistance is 0.05 ohm. Calculate the total armature current
(a) 20 A
(b) 202 A
(c) 2020 A
(d) 200 A
13. If a DC motor is to be selected for conveyors, which motor would be preferred?
(a) Shunt motor
(b) Cumulative compound motor.
(c) Dierentially compound motor
(d) Series motor
14. A 230V dc shunt motor has an armature resistance of 0.3 . Calculate the resistance to be connected in series with
the armature to limit the armature current to 75 A at starting
(a) 0
(b) 3.0667
(c) 2.7667
(d) 2
15. A 1000/200V transformer takes 0.3 A at p.f of 0.2 on open circuit. Find the magnetizing, and iron loss component
of no-load primary current
(a) 0.3A, 0.6A
(b) 0.294A, 0.06A
(c) 0.4A, 0.8A
(d) 0.294A, 0.6A
16. The frequency of voltage generated by an alternator having 4 poles and rotating at 1800rpm is hertz.
(a) 40
(b) 20
(c) 60
(d) 80
17. A 3-phase, 4-pole, 50Hz. Induction motor runs at 1440rpm determine the percentage slip of the induction motor.
(a) 8%
(b) 5%
(c) 2%
(d) 4%
18. The moving coil of a meter has 50 turns and width of 2cm and depth of 3m. it is placed in a uniform radial eld of
5o, wb/m
2
. Find the turning moment of coil when it is carrying, 1mA current.
(a) 1.5 10
3
Nm
(b) 1.5 10
2
Nm
(c) 1.5 10

6 Nm
(d) 1.5Nm
19. An ammeter is used to measure the ow of in a circuit
(a) Voltage
(b) Current
(c) Power
(d) Energy
20. Slow, but continuous rotation of the disc of an energy meter is called
(a) creeping
(b) sweeping
(c) crawling
(d) friction error
Ans: C D C A C D B B B A B B D C B C D C B A
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1. A battery has an emf of 12.9 volts and supplies a current of 3.5 A. What is the resistance of the circuit?
(a) 3.69
(b) 16.4
(c) 3.5
(d) 45.15
2. What is the current in the circuit 2 shown below?
Figure 2
(a) 2mA
(b) 2A
(c) 0.2A
(d) 2A
3. If one of the resistors in parallel circuit is removed, what happens to the total resistance
(a) remain constant
(b) exactly doubles
(c) increases
(d) decreases
4. A battery has 3 cells in parallel. Each has an emf of 1.5V and internal resistance 0.6. Find the current delivered
by it into a load of 1.8
(a) 1A
(b) 75A
(c) 7.5A
(d) 0.75A
5. A pure inductive coil allows a current of 10 A to ow from a 230v, 50Hz supply. What is the Inductance of the
coil?
(a) 23.5/
(b) 0.23/
(c) 10/
(d) 26/
6. Average of 230V, 50Hz is applied to a 318 F pure capacitor, what is the equation for current ?
(a) 32.53 sin (314t - /2)
(b) 23 sin (314t + /2)
(c) 23 sin 314t
(d) 32.53 sin (314t + /2)
7. A coil having a resistance of 15 and an inductance of 0.1H is connected in series with a 230 V, 50Hz supply.
Calculate the phase dierence between voltage and current
(a) 64
0
(b) 90
0
(c) 64
0
30
1
(d) 65
0
8. A capacitor of capacitance 79.5 F is connected in series with a non inductive resistance of 30 across 100v, 50Hz
supply. Find the capacitive reactance of the circuit
(a) 42
(b) 38
(c) 40
(d) 47
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 1A
(b) 0.1A
(c) 0.01A
(d) 10A
10. In a 3-phase delta connected balanced system, the phase dierence of voltages is
(a) 24
0
(b) 0
0
(c) 60
0
(d) 120
0
11. A d.c series motor should always be started with load, because it at no-load
(a) cannot start
(b) will rotate at dangerously high speed
(c) will not develop high starting torque
(d) draws a small current
12. If a shunt generator fails to buildup any voltage at no-load, the reason may be that
(a) Load resistance is more than critical resistance
(b) There is excess of residual Magnetism.
(c) Field resistance is less than critical resistance
(d) There is no residual Magnetism
13. Which DC motor is generally preferred for cranes and hoists?
(a) Cumulative compound motor
(b) Dierentially compound motor
(c) Shunt motor
(d) Series motor
14. An ideal transformer does not change
(a) power factor
(b) voltage
(c) current
(d) power
15. Eddy current loss in a transformer depends on
(a) voltage alone
(b) current alone
(c) frequency alone
(d) both current and frequency
16. A salient pole synchronous motor is running at no-load if its eld current is switched o, then the motor will
(a) remain running at synchronous speed
(b) remain running at a speed slightly more than the synchronous
(c) remain running at a speed slightly less than the synchronous speed
(d) come to stop
17. Single phase induction motor are made self starting by
(a) using an external starting device
(b) increasing rotor resistance
(c) decreasing rotor resistance
(d) providing an additional winding on the stator called the auxiliary winding
18. The damping torque provided in moving coil instruments is
(a) Mechanical
(b) Fluid Friction Damping
(c) Eddy current
(d) Air friction
19. The force responsible for reduction of oscillations in an ammeter is
(a) controlling force
(b) damping force
(c) deecting and controlling force
(d) deecting force
20. Slow, but continuous rotation of the disc of an energy meter is called
(a) friction error
(b) crawling
(c) creeping
(d) sweeping
Ans: A D C D B D C C B D B D D D D A D C B C
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1. In the Figure 1 the current direction is
Figure 1
(a) from b to a
(b) only b
(c) from a to b
(d) only a
2. In any closed circuit, the algebraic sum of all the electromotive forces and the voltage drops is equal to
(a) two
(b) zero
(c) constant
(d) one
3. For a parallel circuit, which statement is correct
(a) I
1
+I
2
+I
3
= 0
(b) P
T
= P
1
+P
2
+P
m
(c) I
i
=
RT
R
i
+R
T
I
T
(d) P
T
=
V S
2
R
T
4. Ten cells, each of emf 1.5v and Internal resistance 0.2 are connected in series. What current will they send through
an external resistance of 4
(a) 6.0
(b) 60
(c) 2.5
(d) 3.75
5. In a pure resistive circuit, the instantaneous voltage and current are given by V=250sin 314t; i=10sin 314t. What
is the peak power consumed in the circuit ?
(a) 2500W
(b) 1000W
(c) 2000W
(d) 1200W
6. In the gure 6 shown, below the wave form belongs to
Figure 6
(a) pure resistor
(b) pure capacitor
(c) Inductor
(d) pure Inductor
7. The equation of 50 Hz ac sinusoidal current having an rms value of 10A is
(a) 10 sin (2 50t)
(b) 14.14 [2 50 (t )]
(c) 14.4 sin (2 50t)
(d) 10[2 50 (t +)]
8. A coil of 0.06H and 2.5 is connected in series with a 6.8 F capacitor is connected to a 230V, 50Hz a c supply.
Calculate the eective reactance of the circuit
(a) 470.2
(b) 510.3
(c) 620.9
(d) 449.16
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the Q factor of the circuit
(a) 10
(b) 1
(c) 0.1
(d) 100
10. If the instantaneous values of phases R and Y in a 3 - circuit are +60V and 40v respectively then phase B must
be
(a) -100V
(b) 80V
(c) -20V
(d) 100V
11. A d.c series motor should always be started with load, because it at no-load
(a) will not develop high starting torque
(b) will rotate at dangerously high speed
(c) cannot start
(d) draws a small current
12. A 100KW 240V shunt generator has a eld resistance of 55 and armature resistance of 0.067. Find the full load
generated voltage
(a) 268.2
(b) 240
(c) 256
(d) 211.8
13. DC shunt motors should never be started on heavy loads because
(a) loads need zero starting torque
(b) loads need no starting torque
(c) loads need minimum starting torque
(d) loads need heavy starting torque
14. A 230V dc shunt motor has an armature resistance of 0.3 . Calculate the resistance to be connected in series with
the armature to limit the armature current to 75 A at starting
(a) 0
(b) 2
(c) 2.7667
(d) 3.0667
15. No load test on a transformer is carried out to determine
(a) Copper loss
(b) Eciency of the transformer.
(c) Magnetising current and loss
(d) Magnetising current
16. The frequency of voltage generated by an alternator having 4 poles and rotating at 1800rpm is hertz.
(a) 60
(b) 40
(c) 80
(d) 20
17. For which Induction motor the speed can be controlled from rotor side?
(a) Shunt Motor
(b) Squirrel case and slip ring
(c) Squirrel case
(d) Slip ring
18. In a moving iron instrument, controlling torque is proportional to
(a) current
(b) deection
(c) torque
(d) voltage
19. An ammeter is connected with the load
(a) In parallel
(b) Across the load
(c) In shunt
(d) In Series
20. Watt hour meter is used to measure
(a) Energy
(b) Voltage
(c) Power
(d) Current
Ans: C B C C A D C D A A B A D C C A D B D A
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1. In the above circuit 1, the current coming to node A from 2 resistor is
Figure 1
(a) 2A
(b) 10A
(c) 1A
(d) 4A
2. In a series circuit, which of the statement is correct
(a) total power = sum of powers of each resistor in series
(b) total power = V I cos
(c) total power = innity
(d) total power = zero
3. For the circuit 3 shown below, nd the total resistance.
Figure 3
(a) 150
(b) 100
(c) 250
(d) 200
4. Dene frequency
(a) the number of cycles that occur in 2 seconds
(b) the number of cycles that occur in 4 seconds
(c) the number of cycles that occur in 1 second
(d) the number of cycles that occur in half seconds
5. A pure inductive coil allows a current of 10A to ow from a 230v, 50Hz supply. Write down the equation for current
(a) 14.14 sin (314t - /2)
(b) 10 sin (314t - /2 )
(c) 14.14 sin (314t + /2)
(d) 10 sin 314t
6. In a pure capacitance, the phasor eldation between V and I is
(a) I lags V by /2
(b) I and V are opposite
(c) I and V are in phase
(d) I leads V by /2
7. Average value of a sinusoidal alternating quantity should be computed over one half - cycle only because the
(a) average value over a complete cycle is less accurate
(b) average value over one half-cycle is more accurate
(c) average value is always less than the maximum value
(d) average value over a complete cycle is zero
8. In an RLC circuit, phase angle is given by
(a) tan
1

X
L
Xc
R

(b) sin
1

X
L
Xc
R

(c) cos
1

X
L
Xc
R

(d) zero
9. Series resonant frequency is given by
(a)
1
2

LC
(b) X
L
(c) X
L
- X
C
(d) X
C
10. In a balanced Delta connection, total 3 power in terms of phase quantities is
(a) V
Ph
I
PH
cos
(b) V
Ph
I
PH
(c) 3V
Ph
I
PH
cos
(d)

3V
Ph
I
PH
cos
11. The part which converts alternating voltage to a direct voltage in a DC machine is
(a) Commutator
(b) Armature
(c) Poles
(d) Brushes
12. A 4 pole shunt generator with lap-connected armature supplies a load of 200 A at 100 V. Shunt eld resistance is
50 ohms, and armature resistance is 0.05 ohm. Calculate the total armature current
(a) 200 A
(b) 202 A
(c) 2020 A
(d) 20 A
13. What type of motors are used to get large starting torque
(a) blower
(b) fans
(c) electric railways
(d) conveyors
14. A 230V dc shunt motor has an armature resistance of 0.3 . Calculate the resistance to be connected in series with
the armature to limit the armature current to 75 A at starting
(a) 2
(b) 3.0667
(c) 2.7667
(d) 0
15. Maximum eciency occurs when
(a) copper loss = iron loss
(b) copper loss = zero
(c) copper loss + iron loss = zero
(d) iron loss = zero
16. Emf equation of an alternator.
(a) zero
(b) 4.44fz
(c) 4.44K
c
.K
d
fT
(d) 4.44fz
17. When the torque is zero, slip is
(a) 5
(b) 100
(c) 1
(d) 10
18. The moving coil of a meter has 50 turns and width of 2cm and depth of 3m. it is placed in a uniform radial eld of
5o, wb/m
2
. Find the turning moment of coil when it is carrying, 1mA current.
(a) 1.5 10

6 Nm
(b) 1.5 10
2
Nm
(c) 1.5Nm
(d) 1.5 10
3
Nm
19. A 0-300V voltmeter has an error of +2% of full scale deection. What would be the range if readings of true voltage
is 30V
(a) 29.4-30.6V
(b) 10-20V
(c) 24-30V
(d) 20-40V
20. Dene meter constant
(a) No. of revolutions made per Newton
(b) No. of revolutions made per kilo-watt hour
(c) No. of revolutions made per hour.
(d) No. of revolutions made per watt
Ans: D A A C A D D A A C A B C C A C C A A B
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1. State Kirchos current Law.
(a) sum of all powers in a circuit
(b) sum of all positive currents is equal to sum of all negative currents.
(c) sum of all positive emfs is equal to the sum of all negative emfs taken in order
(d) sum of all emfs in a circuit
2. In any closed circuit, the algebraic sum of all the electromotive forces and the voltage drops is equal to
(a) zero
(b) two
(c) constant
(d) one
3. For a parallel circuit, which statement is correct
(a) P
T
=
V S
2
R
T
(b) I
1
+I
2
+I
3
= 0
(c) P
T
= P
1
+P
2
+P
m
(d) I
i
=
RT
R
i
+R
T
I
T
4. One cycle of 360
0
corresponds to
(a) 4 radians
(b) 2 radians
(c) 0 radians
(d) radians
5. The main factors which determine the inductive reactance are
(a) inductance and frequency
(b) frequency and induced emf
(c) frequency and current
(d) inductance and applied emf
6. The reactance of a capacitor at 50 Hz is 5 . If the frequency is increased to 100 Hz, the new reactance is
(a) 2.5
(b) 10
(c) 125
(d) 5
7. For series R L circuit, impedance is given by
(a) z =

R
2
+L
2
(b) z =

R
2
(c) z =

R
2
+X
2
1
(d) z =

XL
2
8. A coil of 0.06H and 2.5 is connected in series with a 6.8 F capacitor is connected to a 230v, 50Hz a c supply.
Calculate the eective impedance of the circuit
(a) 510.3
(b) 449.16
(c) 620.9
(d) 470.2
9. In an RC circuit, true power is 300W and reactive power is 1000W. What is the apparent power?
(a) 1000VAR
(b) 1000W
(c) 1000VA
(d) 1043.9 VA
10. Calculate the line currents in a balanced delta connected load taking 75 KW at a power factor 0.8 from a 3-phase,
440V supply.
(a) 150A
(b) 125A
(c) 123A
(d) 100A
11. A six pole lap connected generator has a useful ux/pole of 0.045wb. If the no load voltage at 400rpm is 300V, nd
the conductors on the Armature periphery.
(a) 400
(b) 1000
(c) 1800
(d) 700
12. A compound generator is to supply a load of 250 lamps, each rated at 100W, 250V. The armature, series and shunt
eld resistances are 0.06, 0.04 and 50 respectively. What is the value of armature current when connected in short
shunt.
(a) 100A
(b) 105A
(c) 105.08A
(d) 100.08A
13. Which DC motor will be preferred for constant speed line shafting?
(a) Cumulative compound motor
(b) Dierentially compound motor.
(c) Shunt motor
(d) Series motor
14. While controlling the speed of a dc shunt motor, what should be done to achieve a constant torque drive?
(a) applied power should be kept constant
(b) applied voltage should be maintained constant
(c) applied torque is zero
(d) applied current should be kept constant
15. A 1000/200V transformer takes 0.3 A at p.f of 0.2 on open circuit. Find the magnetizing, and iron loss component
of no-load primary current
(a) 0.4A, 0.8A
(b) 0.294A, 0.6A
(c) 0.294A, 0.06A
(d) 0.3A, 0.6A
16. A 50 Hz alternator will run at the greatest possible speed if it is wound for poles
(a) 6
(b) 2
(c) 4
(d) 8
17. A 3-phase, 4-pole, 50Hz. Induction motor runs at 1440rpm determine the percentage slip of the induction motor.
(a) 5%
(b) 4%
(c) 2%
(d) 8%
18. The shape of the coil used in permanent magnet moving coil instruments is
(a) Rectangular
(b) Parabola
(c) Circular
(d) Elliptical
19. An ammeter is a instrument
(a) recording
(b) absolute
(c) secondary
(d) integrating
20. In Dynamometer type wattmeter, xed coils are connected in with the load
(a) series
(b) shunt
(c) parallel
(d) zero
Ans; B A D B A A C B D C B C C B C B B A C A
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1. In the circuit 1 shown below, nd the total current
Figure 1
(a) I
1
+I
2
+ I
3
= I
4
+I
5
(b) I
1
+I
3
= I
2
+I
4
+I
5
(c) zero
(d) I
1
+I
2
+ I
3
+I
4
+I
5
= 0
2. Droop across y shown in gure 2 is
Figure 2
(a) 66.66V
(b) 6.66V
(c) 0.066V
(d) 0.66V
3. In the circuit 3 shown below. What is the resistance across ac
Figure 3
(a) 1
(b) 8
(c) 10
(d) 9
4. A battery of emf 1.8 volts and internal resistance 1.2 is connected to a pair of resistance 4 and 6in parallel.
Calculate the potential dierence of the battery
(a) 100V
(b) 1V
(c) 1.2V
(d) 10V
5. The A.C voltage across a 150 resistor is 39 sin (2times10
3
t)V At what value of t does the current through the
resistor equal to -0.26A?
(a) 1.0 m sec
(b) 0.75 m sec
(c) 10 m sec
(d) 7.5 m sec
6. Figure 6 shown below The peak to peak value of
Figure 6
(a) 12V
(b) 0V
(c) -6V
(d) +6V
7. For series R L circuit, impedance is given by
(a) z =

R
2
(b) z =

R
2
+L
2
(c) z =

XL
2
(d) z =

R
2
+X
2
1
8. A capacitor and resistor are connected in series across a 120V, 50Hz supply. A circuit draws a current of 1.144A. If
power loss in the circuit is 130.8 W, nd the value of capacitance
(a) 50 F
(b) 200 F
(c) 100 F
(d) 10 m F
9. Given V(t) = 100 sin (50t + 20
0
) true power is 200W, power factor is 0.707 lagging. What are the elements present?
(a) RL
(b) LC
(c) RC
(d) R
10. What is the power in a delta connected system?
(a) V
L
I
L
cos
(b) unity
(c)

3V
L
I
L
cos
(d) 0
11. Why does saturation curve starts from some value higher than zero?
(a) due to power loss
(b) due to eddy current loss
(c) due to residual magnetism
(d) due to hysterisis loss
12. In a shunt generator Ish =
(a) V+I
a
R
a
(b) V/R
sh
(c) V-I
a
R
sh
(d) V

R
sh
13. The condition for maximum power in case of DC motor is
(a) Supply voltage = back emf
(b) Supply voltage =
1
/
2
back emf
(c) back emf = 2 supply voltage
(d) back emf =
1
/
2
supply voltage
14. The principle of operation of transformer is
(a) law of electromagnetic induction
(b) Lenzs law
(c) law of conservation of mass
(d) law of conservation of energy
15. Which of the following is not a part of transformer installation?
(a) Conservator
(b) Iron core
(c) Breather
(d) Exciter
16. A 4-pole, 1200 rpm alternator generates emf at a frequency of
(a) 25Hz
(b) 50Hz
(c) 40Hz
(d) 60Hz
17. When the torque is zero, slip is
(a) 1
(b) 100
(c) 10
(d) 5
18. The shape of the coil used in permanent magnet moving coil instruments is
(a) Rectangular
(b) Elliptical
(c) Parabola
(d) Circular
19. Ammeter is an instrument which measures
(a) power
(b) distance
(c) voltage
(d) current
20. Dene meter constant
(a) No. of revolutions made per kilo-watt hour
(b) No. of revolutions made per watt
(c) No. of revolutions made per hour.
(d) No. of revolutions made per Newton
Ans; B B D C B A D C A C C B D A D C A A D A
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1. State Kirchos current Law.
(a) sum of all powers in a circuit
(b) sum of all emfs in a circuit
(c) sum of all positive currents is equal to sum of all negative currents.
(d) sum of all positive emfs is equal to the sum of all negative emfs taken in order
2. In a series circuit, which of the statement is correct
(a) total power = sum of powers of each resistor in series
(b) total power = V I cos
(c) total power = zero
(d) total power = innity
3. In a parallel circuit, the relation between dierent currents is
(a) Zero = I
1
+ I
2
+ I
3
+ I
4
+
(b) I
1
+ I
2
+ I
3
+ = infinity
(c) I
T
= I
1
I
2
I
3

(d) I
T
= I
1
+ I
2
+ I
3
+
4. An alternating current I is given by I = 141.4 sin 314t. What is the time period of the wave form of i?
(a) 0.02
(b) 10.025
(c) 0.035
(d) 0.03
5. A pure inductive coil allows a current of 10A to ow from a 230v, 50Hz supply. Write down the equation for current
(a) 14.14 sin (314t - /2)
(b) 10 sin (314t - /2 )
(c) 10 sin 314t
(d) 14.14 sin (314t + /2)
6. In the gure 6 shown below the wave form belongs to
Figure 6
(a) pure capacitor
(b) pure resistor
(c) pure inductor
(d) Inductor
7. Form Factor of an alternating Quantity is dene as
(a) RMS value/average value
(b) average value/RMS value
(c) RMS value/peak value
(d) average value/peek value
8. A coil of 0.06H and 2.5 is connected in series with a 6.8 F capacitor. What is the power factor of the circuit
(a) 0.6
(b) 0.8
(c) -0.99
(d) 0.99
9. Average power for a reactive circuit is
(a) 0
(b) -1
(c) innity
(d) 1
10. Voltage V
RY
= 48

30
0
, what does V
Y R
equal?
(a) 48

30
0
(b) 48

60
0
(c) 48

120
0
(d) 48

150
0
11. A lap wound dc machine has 400 conductors and 8 poles the voltage induced per conductor is 2v. The machine
generates a voltage of
(a) 400 V
(b) 100 V
(c) 200 V
(d) 800 V
12. A 4 pole shunt generator with lap-connected armature supplies a load of 200 A at 100 V. Shunt eld resistance is
50 ohms, and armature resistance is 0.05 ohm. Calculate the total armature current
(a) 200 A
(b) 20 A
(c) 202 A
(d) 2020 A
13. If T
a
be the torque and I
a
the armature current for a DC motor, then which of the following relation is valid before
saturation.
(a) Ta I/I
a
(b) Ta I/(Ia)
2
(c) Ta Ia
2
(d) Ta Ia
14. A 50 KVA, single phase transformer has 600 turns on primary and 40 turns on secondary. The primary winding is
connected to 2.2 KV, 50Hz supply. Determine secondary voltage at no load
(a) 146.67V
(b) 100V
(c) 150V
(d) 200V
15. A 1000/200V transformer takes 0.3 A at p.f of 0.2 on open circuit. Find the magnetizing, and iron loss component
of no-load primary current
(a) 0.3A, 0.6A
(b) 0.294A, 0.6A
(c) 0.294A, 0.06A
(d) 0.4A, 0.8A
16. The speed of a 4 pole, 60Hz synchronous machine will be
(a) 3000rpm
(b) 2400rpm
(c) 1800rpm
(d) 3600rpm
17. A 3-phase, 4-pole, 50Hz. Induction motor runs at 1440rpm determine the percentage slip of the induction motor.
(a) 8%
(b) 5%
(c) 2%
(d) 4%
18. In a moving iron instrument, controlling torque is proportional to
(a) torque
(b) current
(c) voltage
(d) deection
19. A moving coil instrument has a resistance of 0.6 and a full scale deection of 0.1A. to convert it into an ammeter
of 0-15A range, the resistance of the shunt should be
(a) 0.1
(b) 0.004
(c) 00.6
(d) 0.6
20. In Dynamometer type wattmeter xed coil is called
(a) Potential coil
(b) Power coil
(c) Energy coil
(d) Current coil
Ans; C A D A A B A D A D B C C A C C D D B D
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1. The ratio of potential dierence (v) between the ends of a conductor to the ohms law current ( I ) owing between
them is
(a)

2
(b)
(c) constant
(d) one
2. Find the voltage between A and B, for the gure 2 shown below
Figure 2
(a) 10V
(b) 90V
(c) 100V
(d) 900V
3. In a parallel circuit, the relation between dierent currents is
(a) I
T
= I
1
I
2
I
3

(b) I
1
+ I
2
+ I
3
+ = infinity
(c) I
T
= I
1
+ I
2
+ I
3
+
(d) Zero = I
1
+ I
2
+ I
3
+ I
4
+
4. A battery of emf 1.8 volts and internal resistance 1.2 is connected to a pair of resistance 4 and 6in parallel.
Calculate the potential dierence of the battery
(a) 1V
(b) 1.2V
(c) 100V
(d) 10V
5. The current in a 2.2 k resistor is I = 5 sin (2 100t +45
0
) mA. What is the eective value of resistor voltage?
(a) 0.778V
(b) 7.78V
(c) 778.0V
(d) 77.8V
6. A 230V, 50Hz supply is connected to a 50 F capacitor, what is the power consumed by the capacitor ?
(a) 2.8J
(b) 2.645J
(c) 3.2J
(d) 0 J
7. Find the peak to peak value of an ac voltage whose eective value is 50V rms?
(a) 7.07 V
(b) 707.0 V
(c) zero
(d) 70.7 V
8. A 10 resistor and 400 F capacitor are connected in series to a 60 V sinusoidal supply. The circuit current is 5 A.
What is the supply frequency
(a) 55Hz
(b) 60Hz
(c) 65Hz
(d) 50Hz
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 1A
(b) 0.01A
(c) 10A
(d) 0.1A
10. A balanced delta connected load of (2+j3) ohms per phase is connected to a balanced 3-phase 440V supply. The
phase current is 10A. Find active power.
(a) 10KW
(b) 50KW
(c) 7.26KW
(d) 100KW
11. A d.c series motor should always be started with load, because it at no-load
(a) cannot start
(b) will rotate at dangerously high speed
(c) draws a small current
(d) will not develop high starting torque
12. The factor that is not responsible for drop in terminal voltage of a dc shunt generator on load is
(a) eld weakening due to armature reaction and armature resistance drop
(b) commutation
(c) armature resistance drop
(d) armature reaction
13. Which DC motor will be preferred for constant speed line shafting?
(a) Series motor
(b) Dierentially compound motor.
(c) Cumulative compound motor
(d) Shunt motor
14. Torque and armature current characteristic is
(a) parabolic
(b) straight line
(c) circle
(d) hyper bolic
15. Material used for construction of transformer core is usually
(a) Copper
(b) Aluminum
(c) Silicon steel
(d) Wood
16. Under no load condition. Power drawn by the prime mover of an alternator of is to
(a) Produce Power in the armature
(b) produce induced emf in armature winding
(c) Meet can losses both in armature and rotor windings
(d) Meet no load losses
17. When the induction motor is stand still, the slip is
(a) zero
(b) 1
(c) innity
(d) 100
18. In moving iron instrument, torque is proportional to
(a) rst derivative of inductance with respect to deection angle.
(b) current
(c) rst derivative of inductance with respect to time
(d) inductance of instrument
19. The multiplier and the meter coil in a voltmeter are in
(a) series-parallel
(b) series
(c) parallel
(d) shunt
20. Units of Energy are
(a) Newton
(b) meters/sec
(c) Joule
(d) Watts
Ans: C B C B B D D B D C B B D B C D B A B C
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1. In the Figure 1 the current direction is
Figure 1
(a) only b
(b) only a
(c) from b to a
(d) from a to b
2. Kirchos voltage law is written as
(a) zero
(b) E=V
1
+ V
2
(c) E+V
1
+ V
2
=0
(d) V
1
+ V
2
=0
3. In the gure 3 shown below nd the current in the resistor R
1
Figure 3
(a) 16.6A
(b) 15V
(c) 15A
(d) 16.6V
4. What is the instantaneous value of V = 5sin (2 10
4
t) volts at time (t) = 25 sec
(a) 0V
(b) 0.137V
(c) 10V
(d) -10V
5. A pure inductive coil allows a current of 10 A to ow from a 230v, 50Hz supply. What is the Inductance of the
coil?
(a) 23.5/
(b) 10/
(c) 26/
(d) 0.23/
6. The power wave form corresponding to a pure inductance contains no. of half cycles
(a) 4
(b) 8
(c) 2
(d) 6
7. Find the peak to peak value of an ac voltage whose eective value is 50V rms?
(a) zero
(b) 70.7 V
(c) 7.07 V
(d) 707.0 V
8. A coil of 0.06H and 2.5 is connected in series with a 6.8 F capacitor is connected to a 230V, 50Hz a c supply.
Calculate the eective reactance of the circuit
(a) 470.2
(b) 449.16
(c) 620.9
(d) 510.3
9. Determine the average power delivered to the circuit consisting of an impedance Z=5+j8 when the current owing
through the circuit is I=5

30
0
(a) 625W
(b) 235.8W
(c) 100W
(d) 10W
10. A balanced 3-phase load consists of three coils, each of resistance 5 and capacitive reactance of 4. Calculate
magnitude of line current if a balanced 3- source of 100v is applied across it
(a) 6.928A
(b) 69.28A
(c) 9.02A
(d) zero
11. A d.c series motor should always be started with load, because it at no-load
(a) will rotate at dangerously high speed
(b) cannot start
(c) will not develop high starting torque
(d) draws a small current
12. A compound generator is to supply a load of 250 lamps, each rated at 100V, 250V. The armature, series, shunt
eld winding resistances are 0.06. 0.04 and 50 respectively. What is the value of generated emf when connected
in long shunt?
(a) 239.5
(b) 262.5
(c) 250V
(d) 260.5
13. If T
a
be the torque and I
a
the armature current for a DC motor, then which of the following relation is valid before
saturation.
(a) Ta Ia
(b) Ta I/I
a
(c) Ta I/(Ia)
2
(d) Ta Ia
2
14. While controlling the speed of a dc shunt motor, what should be done to achieve a constant torque drive?
(a) applied power should be kept constant
(b) applied torque is zero
(c) applied current should be kept constant
(d) applied voltage should be maintained constant
15. A transformer can have regulation closer to zero
(a) On leading power factor
(b) On over load
(c) On full load
(d) On zero Power factor
16. The speed of a P-pole synchronous machine in rpm is given by
(a) 120f/P
(b) 120 P/F
(c) 120P/f
(d) Root of 120f/P
17. After starting winding of a single phase induction motor is disconnected from supply, it continuous to run only on
winding.
(a) Running
(b) Field
(c) Rotor
(d) Compensating
18. The shape of the iron piece used in Attraction type moving iron instruments is
(a) Circular
(b) Elliptical
(c) Rectangular
(d) Oval
19. An ammeter is a instrument
(a) integrating
(b) recording
(c) absolute
(d) secondary
20. Units of Energy are
(a) Newton
(b) Joule
(c) Watts
(d) meters/sec
Ans; D B A B D C B B B C A D D D A A A D D B
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1. A resistor takes 0.3 A at 230v. If the voltage is reduced to 100v, What is the current taken by the resistor
(a) 0.13 A
(b) 0.69 A
(c) 0.18 A
(d) 0.3 A
2. The following voltage drops are measured across each of three resistors in series: 5.2V, 8.5V, 12.3V. What is the
value of the source voltage to which these resistors are connected?
(a) 26V
(b) 5.2V
(c) 8.2V
(d) 12.3V
3. Power in a parallel circuit is equal to
(a) product of all powers
(b) sum of all resistors in parallel
(c) sum of all powers in parallel
(d) product of all resistors in parallel
4. A cell of emf 2V and internal resistance 1 is connected with two wires of resistances 2 and 5 in parallel. Find
the current through the circuit
(a) 100/12A
(b) 17/14A
(c) 0 A
(d) 14/17A
5. The main factors which determine the inductive reactance are
(a) frequency and current
(b) inductance and frequency
(c) frequency and induced emf
(d) inductance and applied emf
6. One sine wave has a positive peak at 75
0
, another has a positive peak at 100
0
. How much in each sine wave shifted
in phase from 0
0
reference.
(a) 15
0
, 10
0
(b) 15
0
, 15
0
(c) 10
0
, 10
0
(d) 100
0
100
0
7. What is the eective value of sine wave with a maximum value of 95V?
(a) zero
(b) 95V
(c) 50V
(d) 67.2V
8. In an RLC series circuit, if the dierence between X
L
and X
C
increases, then the total
(a) impedance remains unchanged
(b) impedance increases
(c) impedance reduce
(d) resistance increases
9. For resonant series circuit, for f < fr, the behavior of circuit is
(a) circuit is resistive
(b) circuit is R - L - C
(c) circuit is capacitive
(d) circuit is inductive
10. In a balanced Delta connection, I
Ph
=
(a) I
L
/

3
(b) I
L
(c)

3I
L
(d)

2I
L
11. Why is armature core of dc generator laminated?
(a) to reduce friction and windage loss
(b) to reduce hysteresis loss
(c) to reduce eddy current loss
(d) to reduce copper losses
12. In a shunt generator Ish =
(a) V

R
sh
(b) V-I
a
R
sh
(c) V+I
a
R
a
(d) V/R
sh
13. DC shunt motors should never be started on heavy loads because
(a) loads need heavy starting torque
(b) loads need minimum starting torque
(c) loads need no starting torque
(d) loads need zero starting torque
14. The path of a magnetic ux in a transformer should have
(a) High reluctance
(b) Low reluctance
(c) High resistance
(d) Low resistance
15. The full load copper loss of a transformer is 1600W. At half load the copper loss will be
(a) 1600W
(b) 6400W
(c) 800W
(d) 400W
16. The frequency of voltage generated by an alternator having 4 poles and rotating at 1800rpm is hertz.
(a) 80
(b) 20
(c) 60
(d) 40
17. If N
S
is the synchronous speed and s is the slip, then the actual running speed of an induction motor will be
(a) (1-s) N
S
(b) N
S
(c) s N
S
(d) (N
S
1) s
18. In the attraction type moving Iron instruments the deection is proportional to
(a) Square of coil current
(b) Square root of coil current
(c) Cube of coil current
(d) 0.707 of coil current
19. A 0-300V voltmeter has an error of +2% of full scale deection. What would be the range if readings of true voltage
is 30V
(a) 20-40V
(b) 24-30V
(c) 10-20V
(d) 29.4-30.6V
20. Slow, but continuous rotation of the disc of an energy meter is called
(a) creeping
(b) sweeping
(c) crawling
(d) friction error
Ans; A A C D B A D B C A C D A B D C A A D A
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1. Graph between current and voltage if the resistance of the circuit is kept constant is
(a) semi-circle
(b) hyperbolic
(c) straight line
(d) parabolic
2. What is the rule followed for kirchos voltage law?
(a) loop rule
(b) mesh rule
(c) wheat stone rule
(d) current rule
3. Power in a parallel circuit is equal to
(a) sum of all resistors in parallel
(b) product of all powers
(c) sum of all powers in parallel
(d) product of all resistors in parallel
4. Ten cells, each of emf 1.5v and Internal resistance 0.2 are connected in series. What current will they send through
an external resistance of 4
(a) 2.5
(b) 6.0
(c) 60
(d) 3.75
5. The inductive reactance of an inductor in a ac circuit (in ohms) is
(a) zero
(b) 1/L
(c)
(d) L
6. The current through a 15 PF capacitor is 0.45 sin (10
8
t + 45
0
) mA. Write the mathematical expression for the
voltage across it.
(a) 0.45 sin (10
8
t 0
0
) V
(b) 0.45 sin (10
8
t 45
0
) V
(c) 0.3 sin (10
8
t 45
0
) V
(d) 0.3 sin (10
8
t + 45
0
) V
7. Find the peak to peak value of an ac voltage whose eective value is 50V rms?
(a) 7.07 V
(b) 707.0 V
(c) zero
(d) 70.7 V
8. In an RLC circuit, phase angle is given by
(a) tan
1

X
L
Xc
R

(b) sin
1

X
L
Xc
R

(c) cos
1

X
L
Xc
R

(d) zero
9. In an RC circuit, true power is 300W and reactive power is 1000W. What is the apparent power?
(a) 1000VA
(b) 1043.9 VA
(c) 1000VAR
(d) 1000W
10. Three 50 ohm resistors are connected in star across 400V, 3-phase supply. Find phase current
(a) 4.5 A
(b) 4.62 A
(c) 4 A
(d) 5 A
11. A DC series generator has a generated emf and terminal voltages of 220V and 210V respectively. If the resistance
of the series eld is 0.2|Omega what is the resistance of the Armature winding?
(a) 0.5
(b) 0.8
(c) 0.75
(d) 0.2
12. What type of generator is used for electric welding?
(a) dierential compound wound dc generator
(b) series wound dc generator
(c) shunt wound dc generator
(d) cumulative compound wound dc generator
13. When speed of a DC motor increases
(a) E
b
and I
L
decreases
(b) E
b
decreases and I
L
increases.
(c) E
b
and I
L
increases
(d) E
b
increases, I
L
decreases
14. A 230V dc shunt motor has an armature resistance of 0.3 . Calculate the resistance to be connected in series with
the armature to limit the armature current to 75 A at starting
(a) 2
(b) 3.0667
(c) 2.7667
(d) 0
15. A 1000/200V transformer takes 0.3 A at p.f of 0.2 on open circuit. Find the magnetizing, and iron loss component
of no-load primary current
(a) 0.3A, 0.6A
(b) 0.294A, 0.6A
(c) 0.4A, 0.8A
(d) 0.294A, 0.06A
16. The speed of a P-pole synchronous machine in rpm is given by
(a) Root of 120f/P
(b) 120 P/F
(c) 120f/P
(d) 120P/f
17. Two main parts of a 3-phase induction motor are
(a) rotor and stator
(b) slip ring and brushes
(c) stator and eld
(d) rotor and armature
18. A PMMC instrument has a coil of dimensions 15mm12mm The u density in the sair gap is 1.810
3
wb/m
2
and
the spring constant is 0.1410
6
Nm/rad. Determine the number of turns required to produce an angular deection
of 90degrees when a current of 5mA is owing through the coil
(a) 100
(b) 140
(c) 120
(d) 136
19. The multiplier and the meter coil in a voltmeter are in
(a) parallel
(b) series-parallel
(c) series
(d) shunt
20. Power in AC circuits is given by
(a) VI
(b) VI tan
(c) VI cos
(d) VI sin
Ans; C A C A D C D A B B B A D C D C A D C C
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1. What is the relationship between the resistance and voltage when the current is kept constant?
(a) directly proportional
(b) equal to
(c) constant
(d) inversely proportional
2. In a series circuit, which of the statement is correct
(a) total power = sum of powers of each resistor in series
(b) total power = zero
(c) total power = V I cos
(d) total power = innity
3. For a parallel circuit, which statement is correct
(a) P
T
=
V S
2
R
T
(b) P
T
= P
1
+P
2
+P
m
(c) I
1
+I
2
+I
3
= 0
(d) I
i
=
RT
R
i
+R
T
I
T
4. What is the instantaneous value of V = 5sin (2 10
4
t) volts at time (t) = 25 sec
(a) -10V
(b) 0V
(c) 10V
(d) 0.137V
5. A pure inductive coil allows a current of 10 A to ow from a 230v, 50Hz supply. What is the Inductance of the
coil?
(a) 10/
(b) 26/
(c) 0.23/
(d) 23.5/
6. Average value of sine wave over half a cycle of f(t) = sinwt.
(a) -0.637V
P
(b) zero
(c) 0.637V
P
(d) unity
7. Find the peak to peak value of an ac voltage whose eective value is 50V rms?
(a) 7.07 V
(b) 70.7 V
(c) zero
(d) 707.0 V
8. A coil of 0.06H and 2.5 is connected in series with a 6.8 F capacitor. What is the power factor of the circuit
(a) 0.99
(b) 0.8
(c) 0.6
(d) -0.99
9. What is the condition for resonance?
(a) phase angle is 90
0
lag
(b) phase angle is zero
(c) phase angle is 90
0
load
(d) phase angle is 180
0
10. In a star connected alternator, the emf generated in each phase is 3810 volts. Calculate line voltage
(a) 600 V
(b) 660 V
(c) 6600 V
(d) 6.6 V
11. A d.c series motor should always be started with load, because it at no-load
(a) draws a small current
(b) will rotate at dangerously high speed
(c) cannot start
(d) will not develop high starting torque
12. A compound generator is to supply a load of 250 lamps, each rated at 100W, 250V. The armature, series and shunt
eld resistances are 0.06, 0.04 and 50 respectively. What is the value of armature current when connected in short
shunt.
(a) 100.08A
(b) 100A
(c) 105.08A
(d) 105A
13. DC shunt motors should never be started on heavy loads because
(a) loads need zero starting torque
(b) loads need no starting torque
(c) loads need heavy starting torque
(d) loads need minimum starting torque
14. While controlling the speed of a dc shunt motor, what should be done to achieve a constant torque drive?
(a) applied current should be kept constant
(b) applied power should be kept constant
(c) applied torque is zero
(d) applied voltage should be maintained constant
15. The transformer ratings are usually expressed in terms of
(a) KW
(b) Volts
(c) KVA
(d) Amperes
16. A 4-pole, 50Hz synchronous motor runs at
(a) 1,500rpm
(b) 700rpm
(c) 3000rpm
(d) 1,490rpm
17. What is the dierence between a 3-phase Induction motor and 1- induction motor?
(a) stator is provided with a single phase between 2poles
(b) constriction for 1- and 3- is same.
(c) rotor is provided with a single phase between 2poles
(d) both stator and rotor are same
18. The damping torque provided in moving coil instruments is
(a) Air friction
(b) Eddy current
(c) Mechanical
(d) Fluid Friction Damping
19. An ammeter is connected with the load
(a) In parallel
(b) In shunt
(c) Across the load
(d) In Series
20. In Dynamometer type wattmeter movable coil is called
(a) Power coil
(b) Potential coil
(c) Energy coil
(d) Current coil
Ans: A A D D C C B A B C B C C D C A A B D B
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1. In the circuit 1 shown below, nd the total current
Figure 1
(a) zero
(b) I
1
+I
3
= I
2
+I
4
+I
5
(c) I
1
+I
2
+ I
3
+I
4
+I
5
= 0
(d) I
1
+I
2
+ I
3
= I
4
+I
5
2. In the circuit 2 given below, V
1
= 7.5V; V
2
= 12.5V then E=?
Figure 2
(a) 0V
(b) 7.5V
(c) 12.5V
(d) 20V
3. Determine the total current in the circuit 3 shown below.
Figure 3
(a) 0A
(b) 10A
(c) 5A
(d) 1A
4. A battery of emf 1.8 volts and internal resistance 1.2 is connected to a pair of resistance 4 and 6in parallel.
Calculate the potential dierence of the battery
(a) 100V
(b) 10V
(c) 1.2V
(d) 1V
5. The A.C voltage across a 150 resistor is 39 sin (2times10
3
t)V At what value of t does the current through the
resistor equal to -0.26A?
(a) 7.5 m sec
(b) 10 m sec
(c) 0.75 m sec
(d) 1.0 m sec
6. What is the capacitance needed to produce 1200 of reactance when the frequency is 2.3 MHz?
(a) zero
(b) 57.7 PF
(c) 57.7 F
(d) 5.77 PF
7. A coil having a resistance of 7 and an inductance of 31.8 mH is connected to 230 v, 50Hz supply. What is the
Inductive reactance of the coil?
(a) 25
(b) 15
(c) 10
(d) 20
8. In an RLC series circuit, if the dierence between X
L
and X
C
increases, then the total
(a) impedance reduce
(b) resistance increases
(c) impedance increases
(d) impedance remains unchanged
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 1A
(b) 10A
(c) 0.01A
(d) 0.1A
10. The algebraic sum of the instantaneous phase voltages of a 3-phase circuit is
(a) zero
(b) line voltage
(c) twice the phase voltage
(d) phase voltage
11. Why is armature core of dc generator laminated?
(a) to reduce copper losses
(b) to reduce hysteresis loss
(c) to reduce friction and windage loss
(d) to reduce eddy current loss
12. In a shunt generator Ish =
(a) V

R
sh
(b) V-I
a
R
sh
(c) V/R
sh
(d) V+I
a
R
a
13. Which DC motor is preferred for elevators?
(a) Shunt motor
(b) Dierentially compound motor
(c) Cumulatively compound motor
(d) Series motor
14. Torque and armature current characteristic is
(a) straight line
(b) circle
(c) hyper bolic
(d) parabolic
15. If the supply frequency in a transformer is doubled, then
(a) copper losses doubles
(b) iron losses doubles
(c) hysteresis loss also doubles
(d) eddy current loss also doubles
16. While running, a synchronous motor is compelled to run at synchronous speed because of
(a) Compulsion due to Lenzs law
(b) Magnetic locking between stator and rotor poles
(c) Induced emf in rotor eld winding by stator ux
(d) Damper winding in its pole faces
17. What is the dierence between a 3-phase Induction motor and 1- induction motor?
(a) both stator and rotor are same
(b) stator is provided with a single phase between 2poles
(c) constriction for 1- and 3- is same.
(d) rotor is provided with a single phase between 2poles
18. In the attraction type moving Iron instruments the deection is proportional to
(a) Cube of coil current
(b) Square of coil current
(c) 0.707 of coil current
(d) Square root of coil current
19. Voltmeter is connected to the load
(a) In Diagonal
(b) In series
(c) In Parallel
(d) In series and In Parallel
20. Dene meter constant
(a) No. of revolutions made per Newton
(b) No. of revolutions made per watt
(c) No. of revolutions made per hour.
(d) No. of revolutions made per kilo-watt hour
Ans: B D C C C B C C D A D C D A C B B B C D
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1. In the above circuit 1, the current coming to node A from 2 resistor is
Figure 1
(a) 4A
(b) 2A
(c) 10A
(d) 1A
2. Droop across y shown in gure 2 is
Figure 2
(a) 6.66V
(b) 0.66V
(c) 0.066V
(d) 66.66V
3. If a 10V battery is connected across the parallel resistor of 3, 5, 10 and 20, how much voltage is there across
5 resistor?
(a) 3V
(b) 5V
(c) 20V
(d) 10V
4. A battery of emf 12V is connected to an external resistance of 20 and it is found to have a potential dierence of
10V. Find its internal resistance
(a) 400
(b) 40
(c) 0.4
(d) 4
5. The A.C voltage across a 150 resistor is 39 sin (2times10
3
t)V At what value of t does the current through the
resistor equal to -0.26A?
(a) 10 m sec
(b) 0.75 m sec
(c) 7.5 m sec
(d) 1.0 m sec
6. To 318 F capacitance, voltage of 230v, 50Hz is connected, what is the value capacitive reactance.
(a) 12
(b) 8
(c) 6
(d) 10
7. A coil having a resistance of 7 and an inductance of 31.8mH is connected to 230v, 50Hz supply. What is the
impedance of the coil.
(a) 12.2
(b) 12.8
(c) 12.6
(d) 12.4
8. A 318 F capacitor is connected across a 230V, 50Hz system. Find RMS value of current
(a) 30A
(b) 33A
(c) 1A
(d) 23A
9. Q - factor of a series resonant circuit is
(a) voltage / current
(b) voltage across L or C / Applied voltage
(c) power factor
(d) L / C
10. A balanced delta connected load of (2+j3) ohms per phase is connected to a balanced 3-phase 440V supply. The
phase current is 10A. Find active power.
(a) 50KW
(b) 100KW
(c) 7.26KW
(d) 10KW
11.
For the gure 11 shown, the total resistance between terminals a and is given
by Figure 11
(a) R
a
/R
(b) Ra-R
(c) R
a
+R
(d) R
a
R/Ra+R
12. In a short shunt compound generator, the terminal voltage is equal to
(a) E
g
I
L
R
se
(b) E
g
I
a
R
a
I
L
R
se
(c) E
g
I
a
R
a
+I
L
R
se
(d) E
g
+I
a
R
a
13. For DC series motor, speed-torque characteristic
(a) hyperbolic
(b) parabolic
(c) straight line
(d) zero
14. Which relation is correct?
(a) N /Eb
(b) N 1/I
(c) N 1/Eb
(d) N Eb
15. Material used for construction of transformer core is usually
(a) Silicon steel
(b) Copper
(c) Aluminum
(d) Wood
16. The rotor preferred for alternators applied to hydraulic turbines are
(a) Solid rotor type
(b) Laminated rotor type
(c) Salient pole type
(d) Cylindrical rotor type
17. A 3-phase induction motor is wound for 4-poles and supplied from 50Hz.calculate the synchronous speed
(a) 1500rpm
(b) 1200rpm
(c) 200rpm
(d) 1000rpm
18. The shape of the coil used in permanent magnet moving coil instruments is
(a) Elliptical
(b) Circular
(c) Parabola
(d) Rectangular
19. Ammeter is connected in in the circuit whose current is to be measured
(a) shunt-series
(b) series
(c) series-shunt
(d) shunt
20. The units of power is
(a) Newton
(b) joules
(c) watt hour
(d) watts
Ans: A A D D B D A D D C C B B D A C A D B D
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1. Kirchos current law is based on
(a) law of conservation of energy
(b) law of conservation of electric charge
(c) law of conservation of current
(d) law of conservation of power
2. Find the voltage across 30 resistor shown in gure below 2
Figure 2
(a) 60V
(b) 40V
(c) 50V
(d) 45V
3. When a 1.2K resistors, 100 resistor, 1K resistor and 50 resistor are in parallel, the total resistance is less
than
(a) 1.2
(b) 100
(c) 1K
(d) 50
4. A battery of emf 1.8 volts and internal resistance 1.2 is connected to a pair of resistance 4 and 6in parallel.
Calculate the potential dierence of the battery
(a) 100V
(b) 1V
(c) 10V
(d) 1.2V
5. The current in a 2.2 k resistor is I = 5 sin (2 100t +45
0
) mA. What is the eective value of resistor voltage?
(a) 778.0V
(b) 7.78V
(c) 77.8V
(d) 0.778V
6. What is the capacitance needed to produce 1200 of reactance when the frequency is 2.3 MHz?
(a) 5.77 PF
(b) 57.7 F
(c) zero
(d) 57.7 PF
7. A choke coil takes a current of 2.5 A when connected across a 250v, 50Hz mains and consumes 400W. What is the
power factor of the circuit?
(a) 0.64 lag
(b) 0.68 lag
(c) 0.7 lag
(d) 0.67lag
8. A capacitor of capacitance 79.5 F is connected in series with a non inductive resistance of 30 across 100v, 50Hz
supply. Find the capacitive reactance of the circuit
(a) 47
(b) 40
(c) 42
(d) 38
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 0.1A
(b) 10A
(c) 1A
(d) 0.01A
10. In a balanced Wye connection, total 3 power in terms of phase quantities in
(a) V
Ph
I
Ph
(b)

3 V
Ph
I
Ph
cos
(c) 3 V
Ph
I
Ph
cos
(d) V
Ph
I
Ph
cos
11. A d.c series motor should always be started with load, because it at no-load
(a) cannot start
(b) draws a small current
(c) will rotate at dangerously high speed
(d) will not develop high starting torque
12. The factor that is not responsible for drop in terminal voltage of a dc shunt generator on load is
(a) armature reaction
(b) armature resistance drop
(c) commutation
(d) eld weakening due to armature reaction and armature resistance drop
13. Which DC motor is generally preferred for cranes and hoists?
(a) Shunt motor
(b) Series motor
(c) Cumulative compound motor
(d) Dierentially compound motor
14. A 3 point starter is considered as suitable for
(a) All DC motors.
(b) Shunt motors
(c) Shunt, compound and series motors
(d) Shunt as well as compound motors
15. The ux involved in the emf equation of a transformer has
(a) total value
(b) rms value
(c) maximum value
(d) average value
16. If P is the number of poles, f = frequency in Hz, N=Speed in rpm, the relationship between the three for a
synchronous alternator is given by
(a) f =
PN
120
Hz
(b) N =
fp
120
rpm
(c) p =
fN
120
poles
(d) f =
NP
60
Hz
17. For which Induction motor the speed can be controlled from rotor side?
(a) Slip ring
(b) Shunt Motor
(c) Squirrel case
(d) Squirrel case and slip ring
18. The shape of the iron piece used in Attraction type moving iron instruments is
(a) Circular
(b) Oval
(c) Elliptical
(d) Rectangular
19. An ammeter is used to measure the ow of in a circuit
(a) Current
(b) Energy
(c) Voltage
(d) Power
20. Dene meter constant
(a) No. of revolutions made per kilo-watt hour
(b) No. of revolutions made per Newton
(c) No. of revolutions made per watt
(d) No. of revolutions made per hour.
Ans: B D D D B D A B A C C C B D C A A B A A
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1. A battery has an emf of 12.9 volts and supplies a current of 3.5 A. What is the resistance of the circuit?
(a) 45.15
(b) 3.69
(c) 3.5
(d) 16.4
2. A series circuit consists of a 4.7 k, 5.6k, 9k and 10k resistor. Which resistor has the most voltage across it?
(a) 9 k
(b) 4.7 k
(c) 10 k
(d) 5.6 k
3. Power in a parallel circuit is equal to
(a) product of all powers
(b) sum of all resistors in parallel
(c) sum of all powers in parallel
(d) product of all resistors in parallel
4. A battery of emf 12V is connected to an external resistance of 20 and it is found to have a potential dierence of
10V. Find its internal resistance
(a) 40
(b) 4
(c) 400
(d) 0.4
5. The current in a 2.2 k resistor is I = 5 sin (2 100t +45
0
) mA. What is the eective value of resistor voltage?
(a) 77.8V
(b) 7.78V
(c) 778.0V
(d) 0.778V
6. To 318 F capacitance, voltage of 230v, 50Hz is connected, what is the value capacitive reactance.
(a) 6
(b) 10
(c) 12
(d) 8
7. The equation of 50 Hz ac sinusoidal current having an rms value of 10A is
(a) 14.14 [2 50 (t )]
(b) 10[2 50 (t +)]
(c) 14.4 sin (2 50t)
(d) 10 sin (2 50t)
8. A 318 F capacitor is connected across a 230V, 50Hz system. Find RMS value of current
(a) 30A
(b) 1A
(c) 33A
(d) 23A
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 1A
(b) 0.1A
(c) 10A
(d) 0.01A
10. A balanced delta connected load of (2+j3) ohms per phase is connected to a balanced 3-phase 440V supply. The
phase current is 10A. Find active power.
(a) 10KW
(b) 100KW
(c) 7.26KW
(d) 50KW
11. A d.c series motor should always be started with load, because it at no-load
(a) will rotate at dangerously high speed
(b) cannot start
(c) will not develop high starting torque
(d) draws a small current
12. The factor that is not responsible for drop in terminal voltage of a dc shunt generator on load is
(a) armature resistance drop
(b) commutation
(c) eld weakening due to armature reaction and armature resistance drop
(d) armature reaction
13. Which one of the following is not the function of pole shoes in a DC machine?
(a) To reduce eddy current loss
(b) To spread out ux for better uniformity
(c) To reduce the reluctance of the magnetic path.
(d) To support the eld coils
14. Which relation is correct?
(a) N 1/I
(b) N /Eb
(c) N Eb
(d) N 1/Eb
15. If the supply frequency in a transformer is doubled, then
(a) copper losses doubles
(b) eddy current loss also doubles
(c) hysteresis loss also doubles
(d) iron losses doubles
16. A Synchronous motor can be used as a synchronous capacitor when it is
(a) Under excited
(b) Over loaded
(c) Over excited
(d) Under loaded
17. A 3-phase induction motor is wound for 4-poles and supplied from 50Hz.calculate the synchronous speed
(a) 1500rpm
(b) 1200rpm
(c) 200rpm
(d) 1000rpm
18. In a moving iron instrument, deecting torque is proportional to
(a) square of voltage
(b) voltage
(c) square of operating current
(d) current
19. Voltmeter is used to measure the between two points of a circuit.
(a) Current
(b) Potential dierence
(c) Energy
(d) Power loss
20. In the power equation of an ac circuit, the values of voltage and current are in form
(a) minimum value
(b) direct
(c) rms
(d) maximum value
Ans: B C C B B B C D B C A B A C C C A C B C
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1. In the circuit 1 shown below, V
1
= 10V, E = 30V and R
1
= 5, Find I & R
2
Figure 1
(a) 2A, 5 ohms
(b) 1A, 10 ohms
(c) 2A, 2 ohms
(d) 2A, 10 ohms
2. Droop across y shown in gure 2 is
Figure 2
(a) 6.66V
(b) 66.66V
(c) 0.066V
(d) 0.66V
3. A 330 resistor is in series with the parallel combination of four 1K resistors. A 100V source is connected to the
circuit. Which resistor has the most current through it.
(a) parallel combination of three 1K resistor
(b) parallel combination of two 1K resistor
(c) 330 resistor
(d) 1K resistor
4. A battery of emf 12V is connected to an external resistance of 20 and it is found to have a potential dierence of
10V. Find its internal resistance
(a) 400
(b) 4
(c) 0.4
(d) 40
5. The A.C voltage across a 150 resistor is 39 sin (2times10
3
t)V At what value of t does the current through the
resistor equal to -0.26A?
(a) 7.5 m sec
(b) 10 m sec
(c) 0.75 m sec
(d) 1.0 m sec
6. To 318 F capacitance, voltage of 230v, 50Hz is connected, what is the value capacitive reactance.
(a) 6
(b) 12
(c) 8
(d) 10
7. A coil having a resistance of 7 and an inductance of 31.8 mH is connected to 230 v, 50Hz supply. What is the
Inductive reactance of the coil?
(a) 10
(b) 25
(c) 20
(d) 15
8. A 10 resistor and 400 F capacitor are connected in series to a 60 V sinusoidal supply. The circuit current is 5 A.
What is the supply frequency
(a) 55Hz
(b) 60Hz
(c) 65Hz
(d) 50Hz
9. For resonant series circuit, for f < fr, the behavior of circuit is
(a) circuit is R - L - C
(b) circuit is capacitive
(c) circuit is resistive
(d) circuit is inductive
10. A balanced delta connected load of (2+j3) ohms per phase is connected to a balanced 3-phase 440V supply. The
phase current is 10A. Find active power.
(a) 10KW
(b) 100KW
(c) 50KW
(d) 7.26KW
11. The part which converts alternating voltage to a direct voltage in a DC machine is
(a) Poles
(b) Commutator
(c) Brushes
(d) Armature
12. The terminal voltage of a dc shunt generator on loading
(a) decreases sharply
(b) remains constant
(c) decrease slightly
(d) increases slightly
13. No load speed of which of the following motor will be highest
(a) Cumulative compound motor
(b) Dierentially compound motor.
(c) Series motor
(d) Shunt motor
14. A 3 point starter is considered as suitable for
(a) Shunt as well as compound motors
(b) All DC motors.
(c) Shunt motors
(d) Shunt, compound and series motors
15. While conducting short circuit test on a transformer the following side is short-circuited.
(a) Primary side
(b) Secondary side
(c) Low voltage side
(d) High voltage side
16. When a synchronous motor is started, the eld winding initially:
(a) short circuited
(b) open circuited
(c) excited by a a.c
(d) excited by a d.c sources
17. The No. of slip rings on a squirrel case Induction motor is usually
(a) Two
(b) One
(c) Zero
(d) Three
18. The shape of the coil used in permanent magnet moving coil instruments is
(a) Rectangular
(b) Parabola
(c) Circular
(d) Elliptical
19. The function of shunt in an ammeter is to
(a) bypass the voltage
(b) increase the resistance of ammeter
(c) increase the sensitivity of the ammeter
(d) bypass the current
20. Watt hour meter is used to measure
(a) Voltage
(b) Current
(c) Power
(d) Energy
Ans: D A C B C D A B B D B C C A D A C A D D
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1. Determine the currents I
1
and I
2
, shown in the gure1 below
Figure 1
(a) 6A, -9A
(b) -6A, 9A
(c) zero, zero
(d) 6A, 9A
2. A series circuit consists of a 4.7 k, 5.6k, 9k and 10k resistor. Which resistor has the most voltage across it?
(a) 4.7 k
(b) 5.6 k
(c) 10 k
(d) 9 k
3. In the circuit 3 shown, the current through the 2 resistor is
Figure 3
(a) 0.061
(b) 0.61
(c) 1.0
(d) 6.1
4. A cell of emf 2V and internal resistance 1 is connected with two wires of resistances 2 and 5 in parallel. Find
the current through the circuit
(a) 100/12A
(b) 17/14A
(c) 14/17A
(d) 0 A
5. The A.C voltage across a 150 resistor is 39 sin (2times10
3
t)V At what value of t does the current through the
resistor equal to -0.26A?
(a) 7.5 m sec
(b) 10 m sec
(c) 0.75 m sec
(d) 1.0 m sec
6. The reactance of a capacitor at 50 Hz is 5 . If the frequency is increased to 100 Hz, the new reactance is
(a) 125
(b) 5
(c) 10
(d) 2.5
7. A coil having a resistance of 7 and an inductance of 31.8mH is connected to 230v, 50Hz supply. What is the
impedance of the coil.
(a) 12.4
(b) 12.8
(c) 12.2
(d) 12.6
8. In a series RLC circuit, if X
L
- X
C
is positive, the behavior of the circuit will be
(a) voltage will lead current by
(b) voltage will lag current by
(c) current leads the voltage by
(d) voltage is equal to current
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 0.1A
(b) 1A
(c) 10A
(d) 0.01A
10. In a balanced Delta connection, V
Ph
=
(a)

3V
L
(b) V
L
(c)

2V
L
(d) V
L

3
11.
For the gure 11 shown, the total resistance between terminals a and is given
by Figure 11
(a) R
a
+R
(b) Ra-R
(c) R
a
/R
(d) R
a
R/Ra+R
12. The factor that is not responsible for drop in terminal voltage of a dc shunt generator on load is
(a) armature resistance drop
(b) armature reaction
(c) commutation
(d) eld weakening due to armature reaction and armature resistance drop
13. No load speed of which of the following motor will be highest
(a) Dierentially compound motor.
(b) Series motor
(c) Cumulative compound motor
(d) Shunt motor
14. An ideal transformer does not change
(a) current
(b) voltage
(c) power
(d) power factor
15. Eddy current loss in a transformer depends on
(a) both current and frequency
(b) voltage alone
(c) current alone
(d) frequency alone
16. A Synchronous motor can be used as a synchronous capacitor when it is
(a) Under loaded
(b) Over loaded
(c) Over excited
(d) Under excited
17. The No. of slip rings on a squirrel case Induction motor is usually
(a) One
(b) Two
(c) Zero
(d) Three
18. In a moving iron instrument, at equilibrium position
(a) Deecting torque + controlling torque = 0
(b) Deecting torque = 0
(c) controlling torque = 0
(d) Deecting torque-controlling torque = 0
19. An ammeter is used to measure the ow of in a circuit
(a) Current
(b) Voltage
(c) Energy
(d) Power
20. Dene meter constant
(a) No. of revolutions made per watt
(b) No. of revolutions made per Newton
(c) No. of revolutions made per hour.
(d) No. of revolutions made per kilo-watt hour
Ans: B C B C C D C A A B A C B C A C C D A D
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1. In the above circuit 1, the current coming to node A from 2 resistor is
Figure 1
(a) 10A
(b) 1A
(c) 4A
(d) 2A
2. Find the voltage across 30 resistor shown in gure below 2
Figure 2
(a) 60V
(b) 50V
(c) 45V
(d) 40V
3. Calculate the current in resistance of 10 . In the circuit 3 shown below
Figure 3
(a) 2A
(b) 0.16A
(c) 16.5A
(d) 1.65A
4. A battery has 3 cells in parallel. Each has an emf of 1.5V and internal resistance 0.6. Find the current delivered
by it into a load of 1.8
(a) 7.5A
(b) 0.75A
(c) 1A
(d) 75A
5. The A.C voltage across a 150 resistor is 39 sin (2times10
3
t)V At what value of t does the current through the
resistor equal to -0.26A?
(a) 1.0 m sec
(b) 0.75 m sec
(c) 10 m sec
(d) 7.5 m sec
6. To 318 F capacitance, voltage of 230v, 50Hz is connected, what is the value capacitive reactance.
(a) 12
(b) 8
(c) 6
(d) 10
7. A coil having a resistance of 7 and an inductance of 31.8 mH is connected to 230 v, 50Hz supply. What is the
Inductive reactance of the coil?
(a) 20
(b) 15
(c) 25
(d) 10
8. In a series RLC circuit, if X
L
- X
C
is positive, the behavior of the circuit will be
(a) voltage is equal to current
(b) current leads the voltage by
(c) voltage will lag current by
(d) voltage will lead current by
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 10A
(b) 0.01A
(c) 1A
(d) 0.1A
10. In a 3-phase delta connected balanced system, the phase dierence of voltages is
(a) 120
0
(b) 0
0
(c) 60
0
(d) 24
0
11. Why does saturation curve starts from some value higher than zero?
(a) due to power loss
(b) due to hysterisis loss
(c) due to residual magnetism
(d) due to eddy current loss
12. If a shunt generator fails to buildup any voltage at no-load, the reason may be that
(a) Field resistance is less than critical resistance
(b) There is excess of residual Magnetism.
(c) Load resistance is more than critical resistance
(d) There is no residual Magnetism
13. The condition for maximum power in case of DC motor is
(a) Supply voltage = back emf
(b) back emf =
1
/
2
supply voltage
(c) Supply voltage =
1
/
2
back emf
(d) back emf = 2 supply voltage
14. Which of the following does not change in a transformer?
(a) Frequency
(b) Voltage and Current
(c) Current
(d) Voltage
15. No load test on a transformer is carried out to determine
(a) Copper loss
(b) Eciency of the transformer.
(c) Magnetising current and loss
(d) Magnetising current
16. In an alternator the voltage generated per phase is not proportional to
(a) Number of terms in coil
(b) Power factor
(c) Frequency of wave form
(d) Flux per pole
17. Which of the following components is fabricated out of silicon steel?
(a) Stator core
(b) Bearings
(c) Brushes
(d) Shaft
18. Deection Torque of a moving coil instrument is
(a) T
d
=NBI
(b) T
d
= NBldI
(c) T
d
=NBC
(d) T = F/A
19. An ammeter is used to measure the ow of in a circuit
(a) Power
(b) Voltage
(c) Current
(d) Energy
20. Dene meter constant
(a) No. of revolutions made per hour.
(b) No. of revolutions made per watt
(c) No. of revolutions made per kilo-watt hour
(d) No. of revolutions made per Newton
Ans; C C D B B D D D D A C D B A C B A B C C
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1. In the circuit 1 shown below, nd the total current
Figure 1
(a) zero
(b) I
1
+I
2
+ I
3
= I
4
+I
5
(c) I
1
+I
3
= I
2
+I
4
+I
5
(d) I
1
+I
2
+ I
3
+I
4
+I
5
= 0
2. Dene Kirchos voltage law:-
(a) algebraic sum of emfs - algebraic sum of voltage drops = 0
(b) algebraic sum of emfs + algebraic sum of voltage drops = 0
(c) zero
(d) algebraic sum of currents
3. In the above circuit 3 , the eective resistance between terminals A and B is
Figure 3
(a) 2
(b) 6
(c) 3
(d) 4
4. A battery has 3 cells in parallel. Each has an emf of 1.5V and internal resistance 0.6. Find the current delivered
by it into a load of 1.8
(a) 0.75A
(b) 75A
(c) 1A
(d) 7.5A
5. An A.C circuit consists of a pure resistance of 10 and is connected across an a.c supply of 230V, 50Hz. Give the
equation of voltage
(a) 325.27 sin 314 t
(b) 3.2527 sin 314 t
(c) 325.27 sin 314 t
(d) 32.527 sin 314 t
6. Average of 230V, 50Hz is applied to a 318 F pure capacitor, what is the equation for current ?
(a) 23 sin 314t
(b) 23 sin (314t + /2)
(c) 32.53 sin (314t + /2)
(d) 32.53 sin (314t - /2)
7. A choke coil takes a current of 2.5 A when connected across a 250v, 50Hz mains and consumes 400W. What is the
power factor of the circuit?
(a) 0.67lag
(b) 0.64 lag
(c) 0.7 lag
(d) 0.68 lag
8. A capacitor and resistor are connected in series across a 120v, 50Hz supply. The circuit draws a current of 1.144A.
If the power loss in the circuit is 130.8w, what is the value of resistance in the circuit?
(a) 112
(b) 100
(c) 110
(d) 90
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 10A
(b) 0.1A
(c) 1A
(d) 0.01A
10. A balanced delta connected load of (2+j3) ohms per phase is connected to a balanced 3-phase 440V supply. The
phase current is 10A. Find active power.
(a) 7.26KW
(b) 10KW
(c) 50KW
(d) 100KW
11. In the equation Eg = (zN/60) x (P/A), A = P for which type of Armature winding.
(a) Progressive winding
(b) Wave winding
(c) Lap winding
(d) Retrogressive winding
12. A 100 KW, 230 V shunt generator has R
a
= 0.05 ohm and R
sh
= 57.5 ohms. If the generator operates at rated
voltage calculate the induced voltage at full-load
(a) 300 V
(b) 252 V
(c) 350 V
(d) 250 V
13. Which DC motor is preferred for elevators?
(a) Dierentially compound motor
(b) Series motor
(c) Cumulatively compound motor
(d) Shunt motor
14. In a transformer the energy is conveyed from primary to secondary
(a) Through air
(b) By the ux
(c) Through cooling coil
(d) Through oil
15. Average emf induced per turn is given by
(a) zero volts
(b) 4f
m
volts
(c) 4.44f
m
volts
(d) 4.44f N
m
volts
16. An AC machine which converts 3-phase mechanical energy to electrical energy is
(a) motor
(b) synchronous motor
(c) synchronous generator
(d) generator
17. A 3-phase induction motor is wound for 4-poles and supplied from 50Hz.calculate the synchronous speed
(a) 200rpm
(b) 1000rpm
(c) 1500rpm
(d) 1200rpm
18. In a moving coil instrument the scale is divided.
(a) non-uniform
(b) twice
(c) more at the starting of the meter
(d) uniformly
19. The multiplier and the meter coil in a voltmeter are in
(a) parallel
(b) series-parallel
(c) shunt
(d) series
20. Power in AC circuits is given by
(a) VI
(b) VI tan
(c) VI sin
(d) VI cos
Ans; C B C A C C B B B A C B B B D C C D D D
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1. The algebraic sum of current owing towards a junction in an electric circuit is
(a) equal to voltage in a junction
(b) equal to current owing away from a junction
(c) equal to one
(d) equal to zero
2. In any closed circuit, the algebraic sum of all the electromotive forces and the voltage drops is equal to
(a) zero
(b) constant
(c) one
(d) two
3. In a parallel circuit, the total resistance circuit as the number of resistors connected in parallel
(a) decreases, decreases
(b) decreases, increases
(c) increases, decreases
(d) increases, increases
4. The relation between time period and frequency are
(a) T = 20/f
(b) T f
(c) T = 1/f
(d) f = 20/T
5. An A.C circuit consists of pure resistance of 10 and is connected across an a.c supply of 230V, 50Hz. Calculate
power consumed?
(a) 5000 W
(b) 5500 W
(c) 6000 W
(d) 5290 W
6. In the gure 6 shown below the wave form belongs to
Figure 6
(a) pure Inductor
(b) pure resistor
(c) Inductor
(d) pure capacitor
7. The equation of 50 Hz ac sinusoidal current having an rms value of 10A is
(a) 10 sin (2 50t)
(b) 10[2 50 (t +)]
(c) 14.4 sin (2 50t)
(d) 14.14 [2 50 (t )]
8. A coil of 0.06H and 2.5 is connected in series with a 6.8 F capacitor. What is the power factor of the circuit
(a) 0.99
(b) 0.6
(c) 0.8
(d) -0.99
9. In the circuit 9 shown, Power consumed by 2 resistor is
Figure 9
(a) 1.512W
(b) 3.750
(c) 0.325 W
(d) 0.0375
10. In a star connected alternator, the emf generated in each phase is 3810 volts. Calculate line voltage
(a) 660 V
(b) 600 V
(c) 6.6 V
(d) 6600 V
11. A d.c series motor should always be started with load, because it at no-load
(a) cannot start
(b) will not develop high starting torque
(c) draws a small current
(d) will rotate at dangerously high speed
12. A compound generator is to supply a load of 250 lamps, each rated at 100W, 250V. The armature, series and shunt
eld resistances are 0.06, 0.04 and 50 respectively. What is the value of armature current when connected in short
shunt.
(a) 105A
(b) 100.08A
(c) 105.08A
(d) 100A
13. Which DC motor will be preferred for constant speed line shafting?
(a) Cumulative compound motor
(b) Dierentially compound motor.
(c) Shunt motor
(d) Series motor
14. A 50 KVA, single phase transformer has 600 turns on primary and 40 turns on secondary. The primary winding is
connected to 2.2 KV, 50Hz supply. Determine secondary voltage at no load
(a) 200V
(b) 150V
(c) 146.67V
(d) 100V
15. Eddy current loss in a transformer depends on
(a) both current and frequency
(b) current alone
(c) voltage alone
(d) frequency alone
16. A 4-pole, 50Hz synchronous motor runs at
(a) 1,490rpm
(b) 1,500rpm
(c) 700rpm
(d) 3000rpm
17. A 3-phase induction motor is wound for 4-poles and supplied from 50Hz.calculate the synchronous speed
(a) 200rpm
(b) 1000rpm
(c) 1500rpm
(d) 1200rpm
18. Moving Iron Instruments are
(a) Independent of the direction in which the current passes
(b) Dependent of the direction in which the current passes
(c) independent of the direction in which the voltage passes
(d) Dependent of the direction in which the voltage passes
19. An ammeter is used to measure the ow of in a circuit
(a) Voltage
(b) Power
(c) Current
(d) Energy
20. Watt hour meter is used to measure
(a) Power
(b) Current
(c) Energy
(d) Voltage
Ans; B A B C D A C A A D D C C C A B C A C C
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1. The algebraic sum of current owing towards a junction in an electric circuit is
(a) equal to zero
(b) equal to voltage in a junction
(c) equal to current owing away from a junction
(d) equal to one
2. Dene Kirchos voltage law:-
(a) algebraic sum of currents
(b) algebraic sum of emfs + algebraic sum of voltage drops = 0
(c) zero
(d) algebraic sum of emfs - algebraic sum of voltage drops = 0
3. In the circuit 3 shown, the current through the 2 resistor is
Figure 3
(a) 0.61
(b) 1.0
(c) 6.1
(d) 0.061
4. The relation between time period and frequency are
(a) T = 20/f
(b) f = 20/T
(c) T f
(d) T = 1/f
5. A pure inductive coil allows a current of 10 A to ow from a 230v, 50Hz supply. What is the Inductance of the
coil?
(a) 23.5/
(b) 0.23/
(c) 10/
(d) 26/
6. The reactance of a capacitor at 50 Hz is 5 . If the frequency is increased to 100 Hz, the new reactance is
(a) 125
(b) 5
(c) 10
(d) 2.5
7. Find the peak to peak value of an ac voltage whose eective value is 50V rms?
(a) 7.07 V
(b) 707.0 V
(c) zero
(d) 70.7 V
8. A coil of 0.06H and 2.5 is connected in series with a 6.8 F capacitor. What is the power factor of the circuit
(a) 0.8
(b) -0.99
(c) 0.6
(d) 0.99
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 0.01A
(b) 1A
(c) 0.1A
(d) 10A
10. A balanced delta connected load of (2+j3) ohms per phase is connected to a balanced 3-phase 440V supply. The
phase current is 10A. Find active power.
(a) 7.26KW
(b) 50KW
(c) 10KW
(d) 100KW
11. A d.c series motor should always be started with load, because it at no-load
(a) will rotate at dangerously high speed
(b) draws a small current
(c) cannot start
(d) will not develop high starting torque
12. A compound generator is to supply a load of 250 lamps, each rated at 100W, 250V. The armature, series and shunt
eld resistances are 0.06, 0.04 and 50 respectively. What is the value of armature current when connected in short
shunt.
(a) 105.08A
(b) 100A
(c) 100.08A
(d) 105A
13. Which type of motors are used for producing medium starting torque for conveyors?
(a) DC shunt motor
(b) cumulative compound DC motor
(c) DC series motor
(d) dierential compound DC motor
14. A 230V dc shunt motor has an armature resistance of 0.3 . Calculate the resistance to be connected in series with
the armature to limit the armature current to 75 A at starting
(a) 3.0667
(b) 2.7667
(c) 2
(d) 0
15. Which winding of the transformer has large cross-sectional area?
(a) Primary winding
(b) High voltage winding
(c) Secondary winding
(d) Low voltage winding
16. A 4-pole, 1200 rpm alternator generates emf at a frequency of
(a) 50Hz
(b) 60Hz
(c) 40Hz
(d) 25Hz
17. Why single phase Induction motor not self starting?
(a) Because it is not given by3- supply
(b) The resistance of the stator winding is very high
(c) inductance of the stator winding is high
(d) pulsating current is incapable of producing a rotating torque in the stationary rotor
18. Moving Iron Instruments are
(a) Dependent of the direction in which the current passes
(b) Independent of the direction in which the current passes
(c) Dependent of the direction in which the voltage passes
(d) independent of the direction in which the voltage passes
19. The force responsible for reduction of oscillations in an ammeter is
(a) controlling force
(b) damping force
(c) deecting and controlling force
(d) deecting force
20. Units of Energy are
(a) Joule
(b) meters/sec
(c) Watts
(d) Newton
Ans; C B A D B D D D C A A A C B B C D B B A
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1. The algebraic sum of current owing towards a junction in an electric circuit is
(a) equal to one
(b) equal to current owing away from a junction
(c) equal to voltage in a junction
(d) equal to zero
2. In a series circuit, which of the statement is correct
(a) total power = sum of powers of each resistor in series
(b) total power = innity
(c) total power = zero
(d) total power = V I cos
3. In the gure 3 shown below nd the current in the resistor R
1
Figure 3
(a) 15V
(b) 16.6V
(c) 16.6A
(d) 15A
4. Four cells, each of emf 1.5v and internal resistance 0.5 are connected in parallel across an external resistance of
2.5. What is the current supplied by each cell?
(a) 0.1427
(b) 0.515
(c) 2
(d) 0.634
5. In a pure Inductance, the Average power consumed by the inductor in a complete cycle is
(a) /2
(b)

2
(c) zero
(d) units
6. Average value of sine wave over one complete cycle is
(a) zero
(b) innity
(c) unity
(d) 10
7. The equation of 50 Hz ac sinusoidal current having an rms value of 10A is
(a) 14.14 [2 50 (t )]
(b) 10[2 50 (t +)]
(c) 14.4 sin (2 50t)
(d) 10 sin (2 50t)
8. In an RLC circuit, if X
L
< X
C
, the behavior of the circuit is
(a) capacitive
(b) resonance.
(c) inductance
(d) resistance
9. What is the condition for resonance?
(a) phase angle is 90
0
load
(b) phase angle is 90
0
lag
(c) phase angle is 180
0
(d) phase angle is zero
10. In a star connected alternator, the emf generated in each phase is 3810 volts. Calculate line voltage
(a) 600 V
(b) 6600 V
(c) 660 V
(d) 6.6 V
11. A DC series generator has a generated emf and terminal voltages of 220V and 210V respectively. If the resistance
of the series eld is 0.2|Omega what is the resistance of the Armature winding?
(a) 0.75
(b) 0.5
(c) 0.8
(d) 0.2
12. What type of generator is used for electric welding?
(a) cumulative compound wound dc generator
(b) shunt wound dc generator
(c) series wound dc generator
(d) dierential compound wound dc generator
13. Field winding of a DC series motor is usually provided with thick wire.
(a) As it carries large load current
(b) To reduce the use of insulating materials
(c) T o provided large ux
(d) In order to reduce eddy current.
14. While controlling the speed of a dc shunt motor, what should be done to achieve a constant torque drive?
(a) applied power should be kept constant
(b) applied voltage should be maintained constant
(c) applied torque is zero
(d) applied current should be kept constant
15. A 1000/200V transformer takes 0.3 A at p.f of 0.2 on open circuit. Find the magnetizing, and iron loss component
of no-load primary current
(a) 0.294A, 0.06A
(b) 0.3A, 0.6A
(c) 0.4A, 0.8A
(d) 0.294A, 0.6A
16. Emf equation of an alternator.
(a) 4.44K
c
.K
d
fT
(b) zero
(c) 4.44fz
(d) 4.44fz
17. What is the dierence between a 3-phase Induction motor and 1- induction motor?
(a) both stator and rotor are same
(b) stator is provided with a single phase between 2poles
(c) rotor is provided with a single phase between 2poles
(d) constriction for 1- and 3- is same.
18. The inductance of a moving iron instrument is given by L = (10 + 5 -
2
)H, where is the deection in radian
from zero position. The spring constant is 1210
6
Nm/rad Estimate the deection for a current of 5A
(a) 90
0
(b) 96.8
0
(c) 98.5
0
(d) 0
0
19. Voltmeter is used to measure the between two points of a circuit.
(a) Power loss
(b) Energy
(c) Potential dierence
(d) Current
20. Power in AC circuits is given by
(a) VI sin
(b) VI cos
(c) VI
(d) VI tan
Ans; B A C A C A C A D B C D A B A A B B C B
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1. Ohms Law states that current through a conductor, under conditions is proportional to potential dierence
across the conductor.
(a) constant temperature
(b) constant pressure, temperature and volume
(c) constant pressure
(d) constant volume
2. Droop across y shown in gure 2 is
Figure 2
(a) 0.66V
(b) 0.066V
(c) 66.66V
(d) 6.66V
3. When a 1.2K resistors, 100 resistor, 1K resistor and 50 resistor are in parallel, the total resistance is less
than
(a) 50
(b) 1.2
(c) 100
(d) 1K
4. The maximum current in a sinusoidal a.c circuit is 10A. What is the instantaneous current at 45
0
?
(a) 1A
(b) 7.07A
(c) 0A
(d) 10A
5. A pure inductive coil allows a current of 12 A to ow from a 240V, 50Hz supply. What is the Inductance of the
coil?
(a) /3H
(b) 0.09/H
(c) 1/ 5 H
(d) 0.094H
6. What is the capacitance needed to produce 1200 of reactance when the frequency is 2.3 MHz?
(a) zero
(b) 57.7 PF
(c) 57.7 F
(d) 5.77 PF
7. A coil having a resistance of 7 and an inductance of 31.8 mH is connected to 230v, 50Hz supply. What is the
power factor of the circuit
(a) 0.57 lag
(b) 0.59 lag
(c) 0.7 lag
(d) 0.6 lag
8. A capacitor and resistor are connected in series across a 120V, 50Hz supply. A circuit draws a current of 1.144A. If
power loss in the circuit is 130.8 W, nd the value of capacitance
(a) 100 F
(b) 200 F
(c) 10 m F
(d) 50 F
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 0.01A
(b) 10A
(c) 0.1A
(d) 1A
10. In a balanced Delta connection, V
Ph
=
(a) V
L
(b) V
L

3
(c)

2V
L
(d)

3V
L
11. A d.c series motor should always be started with load, because it at no-load
(a) will not develop high starting torque
(b) will rotate at dangerously high speed
(c) draws a small current
(d) cannot start
12. The factor that is not responsible for drop in terminal voltage of a dc shunt generator on load is
(a) commutation
(b) armature resistance drop
(c) eld weakening due to armature reaction and armature resistance drop
(d) armature reaction
13. Which rule is used to determine the direction of rotation of DC motor?
(a) Columbus law
(b) Lenzs law
(c) Faradays law
(d) Flemings left-hand rule
14. What does a starter consists?
(a) additional capacitance inserted with armature
(b) additional resistance inserted shunt with armature alone
(c) additional inductance inserted with armature
(d) additional resistance inserted in series with the armature alone
15. During a short circuit test, the iron losses are negligible, because
(a) power factor is high
(b) current is high
(c) mutual ux is small
(d) power factor is low
16. When a synchronous motor is started, the eld winding initially:
(a) open circuited
(b) excited by a d.c sources
(c) excited by a a.c
(d) short circuited
17. One of the characteristics of a single phase motor induction is that it
(a) Requires only one winding
(b) Is not self starting
(c) Is Self starting
(d) Can rotate in one direction only
18. The scale of the moving Iron type instrument is
(a) Cramped at the end
(b) Uniform
(c) Scattered
(d) Cramped at the start
19. The force responsible for reduction of oscillations in an ammeter is
(a) damping force
(b) controlling force
(c) deecting and controlling force
(d) deecting force
20. The household energy meter is
(a) integrating instrument
(b) moving coil instrument
(c) recording instrument
(d) indicating instrument
Ans: A D A B C B A A C A B A D D D D B D A A
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1. In the circuit 1 shown below, nd the total current
Figure 1
(a) zero
(b) I
1
+I
2
+ I
3
+I
4
+I
5
= 0
(c) I
1
+I
3
= I
2
+I
4
+I
5
(d) I
1
+I
2
+ I
3
= I
4
+I
5
2. What is the current in the circuit 2 shown below?
Figure 2
(a) 2A
(b) 2mA
(c) 0.2A
(d) 2A
3. For the circuit 3 shown below, nd the total resistance.
Figure 3
(a) 150
(b) 200
(c) 100
(d) 250
4. A battery of emf 1.8 volts and internal resistance 1.2 is connected to a pair of resistance 4 and 6in parallel.
Calculate the potential dierence of the battery
(a) 1V
(b) 10V
(c) 1.2V
(d) 100V
5. The A.C voltage across a 150 resistor is 39 sin (2times10
3
t)V At what value of t does the current through the
resistor equal to -0.26A?
(a) 1.0 m sec
(b) 7.5 m sec
(c) 0.75 m sec
(d) 10 m sec
6. To 318 F capacitance, voltage of 230v, 50Hz is connected, what is the value capacitive reactance.
(a) 10
(b) 6
(c) 8
(d) 12
7. The important factors that determine inductive reactance are
(a) inductance and applied emf
(b) frequency and inductance
(c) inductance and capacitance
(d) resistance and inductance
8. A capacitor and resistor are connected in series across a 120V, 50Hz supply. A circuit draws a current of 1.144A. If
power loss in the circuit is 130.8 W, nd the value of capacitance
(a) 50 F
(b) 10 m F
(c) 100 F
(d) 200 F
9. Series resonant frequency is given by
(a) X
L
- X
C
(b) X
C
(c) X
L
(d)
1
2

LC
10. In a balanced Wye connection I
Ph
=
(a)

2I
L
(b) I
L
/S
2
(c) I
L
/

3
(d) I
L
11. The polarity of a dc generator is reversed by reversing the direction by
(a) zero
(b) eld current as well as rotation
(c) eld current
(d) rotation
12. The factor that is not responsible for drop in terminal voltage of a dc shunt generator on load is
(a) commutation
(b) eld weakening due to armature reaction and armature resistance drop
(c) armature reaction
(d) armature resistance drop
13. Which rule is used to determine the direction of rotation of DC motor?
(a) Flemings left-hand rule
(b) Columbus law
(c) Lenzs law
(d) Faradays law
14. A 3 point starter is considered as suitable for
(a) Shunt as well as compound motors
(b) All DC motors.
(c) Shunt, compound and series motors
(d) Shunt motors
15. The purpose of providing an iron core in transformer is to
(a) Reduce Hysterisis loss
(b) Decrease the reluctance of the magnetic path
(c) Reduce Eddy current losses
(d) Provide Support to windings
16. A Synchronous motor can be used as a synchronous capacitor when it is
(a) Under excited
(b) Over loaded
(c) Over excited
(d) Under loaded
17. The phase dierence between main winding and starting winding of a 1- induction motor is
(a) 45
0
(b) 90
0
(c) 0
0
(d) innity
18. Extension of moving iron ammeter range can be done by using:
(a) inductor
(b) capacitor
(c) multiplier
(d) shunt
19. Ammeter is an instrument which measures
(a) distance
(b) power
(c) voltage
(d) current
20. Dene meter constant
(a) No. of revolutions made per kilo-watt hour
(b) No. of revolutions made per hour.
(c) No. of revolutions made per Newton
(d) No. of revolutions made per watt
Ans; C D A C C A B C D D C A A A C C B D D A
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1. What is the relationship between the resistance and voltage when the current is kept constant?
(a) equal to
(b) inversely proportional
(c) directly proportional
(d) constant
2. Sign convention used for potential is:
(a) rise in potential is positive
(b) rise in potential is zero
(c) Rise in potential is negative
(d) rise in potential is equal to fall in potential
3. In a four branch parallel circuit, 10mA of current ows in each branch. If one of the branch opens, what is the
current in each of the other branches
(a) increases
(b) unaected
(c) doubles
(d) decreases
4. Ten cells, each of emf 1.5v and Internal resistance 0.2 are connected in series. What current will they send through
an external resistance of 4
(a) 6.0
(b) 2.5
(c) 3.75
(d) 60
5. In a pure inductance, the phasor relation between V and I is
(a) I and v are opposite in phase
(b) I lags v by /2
(c) I leads v by /2
(d) I and v are in phase
6. In the gure 6 shown below the wave forms belongs to
Figure 6
(a) pure Inductor
(b) Inductor
(c) pure capacitor
(d) pure resistor
7. Peak factor of an alternating quantity is dened as
(a) Max. value/RMS value
(b) RMS value/average value
(c) RMS value/peak value
(d) average value/RMS value
8. In a series RLC circuit, if X
L
- X
C
is positive, the behavior of the circuit will be
(a) voltage will lag current by
(b) voltage will lead current by
(c) voltage is equal to current
(d) current leads the voltage by
9. In the circuit 9 shown, Power consumed by 2 resistor is
Figure 9
(a) 1.512W
(b) 3.750
(c) 0.0375
(d) 0.325 W
10. In a balanced Delta connection, I
Ph
=
(a)

3I
L
(b) I
L
/

3
(c) I
L
(d)

2I
L
11. A DC series generator has R
a
=0.5, R
se
= 0.5 and the terminal voltage is 220V which delivering a load of 7A.
What is the generator emf of the DC series generator?
(a) 227
(b) 223.5
(c) 220V
(d) 213
12. What type of generator is used for electric welding?
(a) dierential compound wound dc generator
(b) cumulative compound wound dc generator
(c) shunt wound dc generator
(d) series wound dc generator
13. If a DC motor is to be selected for conveyors, which motor would be preferred?
(a) Cumulative compound motor.
(b) Dierentially compound motor
(c) Series motor
(d) Shunt motor
14. A 230V dc shunt motor has an armature resistance of 0.3 . Calculate the resistance to be connected in series with
the armature to limit the armature current to 75 A at starting
(a) 3.0667
(b) 0
(c) 2
(d) 2.7667
15. A 1000/200V transformer takes 0.3 A at p.f of 0.2 on open circuit. Find the magnetizing, and iron loss component
of no-load primary current
(a) 0.3A, 0.6A
(b) 0.294A, 0.06A
(c) 0.294A, 0.6A
(d) 0.4A, 0.8A
16. The speed of a P-pole synchronous machine in rpm is given by
(a) Root of 120f/P
(b) 120f/P
(c) 120P/f
(d) 120 P/F
17. A 3-phase, 4-pole, 50Hz. Induction motor runs at 1440rpm determine the percentage slip of the induction motor.
(a) 2%
(b) 8%
(c) 5%
(d) 4%
18. A PMMC instrument has a coil of dimensions 15mm12mm The u density in the sair gap is 1.810
3
wb/m
2
and
the spring constant is 0.1410
6
Nm/rad. Determine the number of turns required to produce an angular deection
of 90degrees when a current of 5mA is owing through the coil
(a) 120
(b) 100
(c) 140
(d) 136
19. An ammeter is used to measure the ow of in a circuit
(a) Energy
(b) Power
(c) Current
(d) Voltage
20. Slow, but continuous rotation of the disc of an energy meter is called
(a) sweeping
(b) friction error
(c) creeping
(d) crawling
Ans: C A A B B C A B A B A A C D B B D D C C
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1. State Kirchos current Law.
(a) sum of all emfs in a circuit
(b) sum of all positive emfs is equal to the sum of all negative emfs taken in order
(c) sum of all positive currents is equal to sum of all negative currents.
(d) sum of all powers in a circuit
2. What is the rule followed for kirchos voltage law?
(a) mesh rule
(b) current rule
(c) loop rule
(d) wheat stone rule
3. In a parallel circuit, the total resistance circuit as the number of resistors connected in parallel
(a) increases, increases
(b) increases, decreases
(c) decreases, decreases
(d) decreases, increases
4. A battery of emf 12V is connected to an external resistance of 20 and it is found to have a potential dierence of
10V. Find its internal resistance
(a) 4
(b) 400
(c) 40
(d) 0.4
5. In a pure Inductance, the Average power consumed by the inductor in a complete cycle is
(a) zero
(b) units
(c) /2
(d)

2
6. To 318 F capacitance, voltage of 230v, 50Hz is connected, what is the value capacitive reactance.
(a) 6
(b) 8
(c) 12
(d) 10
7. The equation of 50 Hz ac sinusoidal current having an rms value of 10A is
(a) 10[2 50 (t +)]
(b) 14.4 sin (2 50t)
(c) 14.14 [2 50 (t )]
(d) 10 sin (2 50t)
8. A coil of 0.06H and 2.5 is connected in series with a 6.8 F capacitor is connected to a 230V, 50Hz a c supply.
Calculate the eective reactance of the circuit
(a) 470.2
(b) 620.9
(c) 510.3
(d) 449.16
9. In an RC circuit, true power is 300W and reactive power is 1000W. What is the apparent power?
(a) 1000W
(b) 1000VAR
(c) 1043.9 VA
(d) 1000VA
10. A balanced delta connected load of (2+j3) ohms per phase is connected to a balanced 3-phase 440V supply. The
phase current is 10A. Find active power.
(a) 100KW
(b) 7.26KW
(c) 50KW
(d) 10KW
11. A d.c series motor should always be started with load, because it at no-load
(a) cannot start
(b) will not develop high starting torque
(c) will rotate at dangerously high speed
(d) draws a small current
12. A compound generator is to supply a load of 250 lamps, each rated at 100W, 250V. The armature, series and shunt
eld resistances are 0.06, 0.04 and 50 respectively. What is the value of armature current when connected in short
shunt.
(a) 100A
(b) 105.08A
(c) 100.08A
(d) 105A
13. When speed of a DC motor increases
(a) E
b
and I
L
increases
(b) E
b
decreases and I
L
increases.
(c) E
b
and I
L
decreases
(d) E
b
increases, I
L
decreases
14. A 3 point starter is considered as suitable for
(a) Shunt as well as compound motors
(b) Shunt motors
(c) All DC motors.
(d) Shunt, compound and series motors
15. A 1000/200V transformer takes 0.3 A at p.f of 0.2 on open circuit. Find the magnetizing, and iron loss component
of no-load primary current
(a) 0.294A, 0.6A
(b) 0.4A, 0.8A
(c) 0.3A, 0.6A
(d) 0.294A, 0.06A
16. A 50 Hz alternator will run at the greatest possible speed if it is wound for poles
(a) 8
(b) 4
(c) 2
(d) 6
17. What is the dierence between a 3-phase Induction motor and 1- induction motor?
(a) stator is provided with a single phase between 2poles
(b) rotor is provided with a single phase between 2poles
(c) both stator and rotor are same
(d) constriction for 1- and 3- is same.
18. The scale of the moving Iron type instrument is
(a) Cramped at the end
(b) Cramped at the start
(c) Scattered
(d) Uniform
19. The multiplier and the meter coil in a voltmeter are in
(a) parallel
(b) series-parallel
(c) series
(d) shunt
20. In Dynamometer type wattmeter, xed coils are connected in with the load
(a) shunt
(b) series
(c) zero
(d) parallel
Ans: C C D A A D B D C B C B D A D C A B C B
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1. What are the units of voltage, current and Resistance respectively?
(a) Ohms, Volts, Amperes
(b) Volts, Farads, Amperes
(c) Henries, Volts, Amperes
(d) Volts, Amperes, Ohms
2. The following voltage drops are measured across each of three resistors in series: 5.2V, 8.5V, 12.3V. What is the
value of the source voltage to which these resistors are connected?
(a) 26V
(b) 5.2V
(c) 8.2V
(d) 12.3V
3. In the gure 3 shown below nd the current in the resistor R
1
Figure 3
(a) 15V
(b) 15A
(c) 16.6A
(d) 16.6V
4. An alternating current I is given by I = 141.4 sin 314t. What is the frequency of the i?
(a) 60 Hz
(b) 70 Hz
(c) 40 Hz
(d) 50 Hz
5. The unit used to measure the inductive reactance is
(a) ohms
(b) farads
(c) henrys
(d) amperes
6. In the gure 6 shown below the wave forms belongs to
Figure 6
(a) pure Inductor
(b) pure resistor
(c) Inductor
(d) pure capacitor
7. For a pure sinusoidal voltage, the average value over a cycle is
(a)

2
(b)
(c) 1.11
(d) zero
8. For series RC circuit, the relation between voltage and current is
(a) voltage leads the current by
(b) voltage lags the current by
(c) voltage leads by
(d) voltage is equal to currents
9. Q - factor of a series resonant circuit is
(a) L / C
(b) power factor
(c) voltage across L or C / Applied voltage
(d) voltage / current
10. In a balanced Delta connection, total 3 power in terms of phase quantities is
(a) V
Ph
I
PH
(b)

3V
Ph
I
PH
cos
(c) 3V
Ph
I
PH
cos
(d) V
Ph
I
PH
cos
11. A DC series generator has R
a
=0.5, R
se
= 0.5 and the terminal voltage is 220V which delivering a load of 7A.
What is the generator emf of the DC series generator?
(a) 227
(b) 223.5
(c) 213
(d) 220V
12. In a short shunt compound generator, the terminal voltage is equal to
(a) E
g
I
L
R
se
(b) E
g
I
a
R
a
+I
L
R
se
(c) E
g
+I
a
R
a
(d) E
g
I
a
R
a
I
L
R
se
13. Which DC motor will be preferred for constant speed line shafting?
(a) Series motor
(b) Cumulative compound motor
(c) Dierentially compound motor.
(d) Shunt motor
14. Starters are used with DC motors because
(a) To restrict armature current as there is no back emf while starting.
(b) These motors are not self starting
(c) These motors have high starting torque
(d) Back emf of these motors is initially zero
15. The copper loss of certain transformer at half full-load is measured as 400W. Then the copper loss at full load will
be
(a) 200W
(b) 1600W
(c) 800W
(d) 400W
16. The speed of a P-pole synchronous machine in rpm is given by
(a) 120f/P
(b) 120 P/F
(c) 120P/f
(d) Root of 120f/P
17. A 3-phase, 4-pole, 50Hz. Induction motor runs at 1440rpm determine the percentage slip of the induction motor.
(a) 8%
(b) 2%
(c) 4%
(d) 5%
18. The inductance of a moving iron instrument is given by L = (10 + 5 -
2
)H, where is the deection in radian
from zero position. The spring constant is 1210
6
Nm/rad Estimate the deection for a current of 5A
(a) 0
0
(b) 90
0
(c) 96.8
0
(d) 98.5
0
19. A moving coil instrument has a resistance of 0.6 and a full scale deection of 0.1A. to convert it into an ammeter
of 0-15A range, the resistance of the shunt should be
(a) 0.6
(b) 0.1
(c) 00.6
(d) 0.004
20. Dene meter constant
(a) No. of revolutions made per Newton
(b) No. of revolutions made per watt
(c) No. of revolutions made per hour.
(d) No. of revolutions made per kilo-watt hour
Ans; D A C D A D D B A C A D D A B A C C D D
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1. Ohms Law states that current through a conductor, under conditions is proportional to potential dierence
across the conductor.
(a) constant pressure
(b) constant pressure, temperature and volume
(c) constant volume
(d) constant temperature
2. Find the voltage between A and B, for the gure 2 shown below
Figure 2
(a) 100V
(b) 900V
(c) 90V
(d) 10V
3. In a parallel circuit, the relation between dierent currents is
(a) Zero = I
1
+ I
2
+ I
3
+ I
4
+
(b) I
T
= I
1
I
2
I
3

(c) I
1
+ I
2
+ I
3
+ = infinity
(d) I
T
= I
1
+ I
2
+ I
3
+
4. The maximum current in a sinusoidal a.c circuit is 10A. What is the instantaneous current at 45
0
?
(a) 7.07A
(b) 1A
(c) 0A
(d) 10A
5. A resistive heating element is designed for 240V, 60Hz. Calculate its power if its resistance is 28.8 . You and if it
is connected to a 240V, d.c source?
(a) 6 KW
(b) 1 KW
(c) 2 KW
(d) 4 KW
6. To 318 F capacitance, voltage of 230v, 50Hz is connected, what is the value capacitive reactance.
(a) 12
(b) 10
(c) 6
(d) 8
7. Find the peak to peak value of an ac voltage whose eective value is 50V rms?
(a) 707.0 V
(b) zero
(c) 7.07 V
(d) 70.7 V
8. A capacitor and resistor are connected in series across a 120V, 50Hz supply. A circuit draws a current of 1.144A. If
power loss in the circuit is 130.8 W, nd the value of capacitance
(a) 100 F
(b) 50 F
(c) 200 F
(d) 10 m F
9. A coil of resistance 100 and 100 H is connected in series with a 100 PF is connected to a 10V, variable frequency
supply. What is the current through the circuit at resonance.
(a) 0.1A
(b) 1A
(c) 10A
(d) 0.01A
10. A balanced delta connected load of (2+j3) ohms per phase is connected to a balanced 3-phase 440V supply. The
phase current is 10A. Find active power.
(a) 7.26KW
(b) 100KW
(c) 50KW
(d) 10KW
11. A d.c series motor should always be started with load, because it at no-load
(a) draws a small current
(b) will not develop high starting torque
(c) cannot start
(d) will rotate at dangerously high speed
12. The terminal voltage of a dc shunt generator on loading
(a) decreases sharply
(b) decrease slightly
(c) remains constant
(d) increases slightly
13. DC shunt motors should never be started on heavy loads because
(a) loads need zero starting torque
(b) loads need heavy starting torque
(c) loads need minimum starting torque
(d) loads need no starting torque
14. An ideal transformer does not change
(a) current
(b) power
(c) voltage
(d) power factor
15. A transformer can have regulation closer to zero
(a) On leading power factor
(b) On over load
(c) On full load
(d) On zero Power factor
16. While running, a synchronous motor is compelled to run at synchronous speed because of
(a) Compulsion due to Lenzs law
(b) Induced emf in rotor eld winding by stator ux
(c) Damper winding in its pole faces
(d) Magnetic locking between stator and rotor poles
17. Two main parts of a 3-phase induction motor are
(a) rotor and armature
(b) stator and eld
(c) slip ring and brushes
(d) rotor and stator
18. The scale of the moving Iron type instrument is
(a) Uniform
(b) Scattered
(c) Cramped at the end
(d) Cramped at the start
19. An ammeter is used to measure the ow of in a circuit
(a) Voltage
(b) Power
(c) Current
(d) Energy
20. Watt hour meter is used to measure
(a) Current
(b) Voltage
(c) Energy
(d) Power
Ans: D C D A C B D A A A D B B B A D D D C C
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1. State Kirchos current Law.
(a) sum of all positive currents is equal to sum of all negative currents.
(b) sum of all positive emfs is equal to the sum of all negative emfs taken in order
(c) sum of all powers in a circuit
(d) sum of all emfs in a circuit
2. Dene Kirchos voltage law:-
(a) algebraic sum of emfs - algebraic sum of voltage drops = 0
(b) algebraic sum of emfs + algebraic sum of voltage drops = 0
(c) zero
(d) algebraic sum of currents
3. In a four branch parallel circuit, 10mA of current ows in each branch. If one of the branch opens, what is the
current in each of the other branches
(a) unaected
(b) increases
(c) decreases
(d) doubles
4. What is the frequency of the ac supply used in India?
(a) 60 Hz
(b) 40 Hz
(c) 50 Hz
(d) 70 Hz
5. The current in a 2.2 k resistor is I = 5 sin (2 100t +45
0
) mA. What is the eective value of resistor voltage?
(a) 7.78V
(b) 778.0V
(c) 0.778V
(d) 77.8V
6. In the gure 6 shown below the wave form belongs to
Figure 6
(a) pure capacitor
(b) pure resistor
(c) pure inductor
(d) Inductor
7. Find the peak to peak value of an ac voltage whose eective value is 50V rms?
(a) zero
(b) 7.07 V
(c) 70.7 V
(d) 707.0 V
8. A 20V a.c is applied to a circuit consisting of a resistance and a capacitance. If the voltage across the resistance is
12V, the voltage across the capacitance
(a) 6V
(b) 8V
(c) 16V
(d) 10V
9. In an RC circuit, true power is 300W and reactive power is 1000W. What is the apparent power?
(a) 1000VAR
(b) 1000W
(c) 1043.9 VA
(d) 1000VA
10. A balanced 3-phase load consists of three coils, each of resistance 5 and capacitive reactance of 4. Calculate
magnitude of line current if a balanced 3- source of 100v is applied across it
(a) 9.02A
(b) 69.28A
(c) zero
(d) 6.928A
11. A d.c series motor should always be started with load, because it at no-load
(a) draws a small current
(b) cannot start
(c) will rotate at dangerously high speed
(d) will not develop high starting torque
12. In a short shunt compound generator, the resistances of armature, series eld and shunt eld are 0.2, 100, 0.8.
What is the value of shunt eld resistance from the above values?
(a) 101
(b) 100
(c) 08.
(d) 0.2
13. Which one of the following is not the function of pole shoes in a DC machine?
(a) To reduce eddy current loss
(b) To reduce the reluctance of the magnetic path.
(c) To support the eld coils
(d) To spread out ux for better uniformity
14. A 50 KVA, single phase transformer has 600 turns on primary and 40 turns on secondary. The primary winding is
connected to 2.2 KV, 50Hz supply. Determine secondary voltage at no load
(a) 150V
(b) 200V
(c) 146.67V
(d) 100V
15. The transformer ratings are usually expressed in terms of
(a) KW
(b) Volts
(c) Amperes
(d) KVA
16. A 4-pole, 50Hz synchronous motor runs at
(a) 3000rpm
(b) 1,490rpm
(c) 700rpm
(d) 1,500rpm
17. A 3-phase induction motor is wound for 4-poles and supplied from 50Hz.calculate the synchronous speed
(a) 1200rpm
(b) 1000rpm
(c) 200rpm
(d) 1500rpm
18. The scale of the moving Iron type instrument is
(a) Cramped at the start
(b) Scattered
(c) Uniform
(d) Cramped at the end
19. An ammeter is a instrument
(a) secondary
(b) recording
(c) integrating
(d) absolute
20. Wattmeter is used to measure
(a) Energy
(b) Voltage
(c) Current
(d) Power
Ans: A B B C A B C C C A C B A C D D D A A D
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