What is the energy stored in a 50 uF capacitor if the impressed voltage is 220 volts?
Select one:
a. 5.51 joules
b. 1.21 joules
c. 3.63 joules
d. 2.42 joules
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The correct answer is: 1.21 joules
Question 2
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If R = 50 ohms, C = 0.0001 Farad, E = 100 volts and i(0) = 2 amperes, determine the Laplace transform
expression for I(s).
Select one:
a. I(s) = 2/(s + 50)
b. I(s) = 2/[s(s + 2)]
c. I(s) = 2/(s + 200)
d. I(s) = 2/(s + 2)
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The correct answer is: I(s) = 2/(s + 200)
Question 3
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Kirchhoff Laws fail in the case of
Select one:
a. distributed parameter networks
b. linear networks
c. dual networks
d. non-linear networks
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The correct answer is: distributed parameter networks
Question 4
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Refers to a force of field that exists between ions where they either repel or attract each other
Select one:
a. dielectric
b. potential field
c. electromotive
d. resisting field
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The correct answer is: potential field
Question 5
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Find the reading of an AC voltmeter connected across the series source of 100 sin (wt - pi/2) and 100 sin
wt.
Select one:
a. 170.71
b. 130.65
c. 100
d. 184.78
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The correct answer is: 100
Question 6
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A series RC circuit consist of R = 2 M-ohms and an uncharged capacitor C = 5 uF. The circuit is
connected across a 100 V DC source at t = 0. Determine the voltage across the resistor at the instant the
switch is closed and 5 seconds after the switched has been closed.
Select one:
a. 100 V, 60.65 V
b. 0 V, 60.65 V
c. 100 V, 0 V
d. 0 V, 100 V
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The correct answer is: 100 V, 60.65 V
Question 7
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What is the average value of a half wave rectified sinusoidal wave with 70.7 ampere amplitude?
Select one:
a. 22. 5 A
b. 31.6 A
c. 50 A
d. 135.35 A
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The correct answer is: 22. 5 A
Question 8
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_____ is used to store electrical energy in an electrostatic field.
Select one:
a. An inductor
b. A battery
c. A transformer
d. A capacitor
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The correct answer is: A capacitor
Question 9
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Voltage in electrical circuits is analogous to _____ in magnetic circuits.
Select one:
a. Magnetizing force
b. Flux
c. Ampere-turn
d. Magnetomotive force
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The correct answer is: Magnetomotive force
Question 10
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At a 115 kV substation, the PT ratio is 100 and the CT ratio is 1200/5. The potential going into the
wattmeter is 115 volts. What is the MW indicated when the wattmeter reads 800 watts?
Select one:
a. 150 MW
b. 192 MW
c. 19.2 MW
d. 15.0 MW
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The correct answer is: 192 MW
Question 11
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The theory of Ohm law is applied in a _____ circuit.
Select one:
a. exponential
b. unilateral
c. trivalent
d. linear
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The correct answer is: linear
Question 12
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Which part of the oscilloscope emits electrons?
Select one:
a. Heater cathode
b. Grid
c. Accelerating anode
d. Cathode ray tube
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The correct answer is: Heater cathode
Question 13
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The impedances of two parallel branches of a circuit are (10 + j10) and (10 - j10) respectively. The
impedance of the parallel combination is
Select one:
a. 5 - j5
b. 10 + j0
c. 0 - j20
d. 20 + j0
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The correct answer is: 5 - j5
Question 14
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A metal transport plane has a wing spread of 88 ft. What difference of potential exists between the
extremities of the wings, when the plane moves horizontally with the speed of 150 miles per hour? The
value of the vertical-component of the magnetic field of the earth is 0.65 Gauss at the plane.
Select one:
a. 12 Volt
b. 0.24 Volt
c. 0.12 volt
d. 1.2 Volt
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The correct answer is: 12 Volt
Question 15
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Find the dielectric constant to air
Select one:
a. Approximately 4
b. Approximately 0
c. Approximately 1
d. Approximately 2
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The correct answer is: Approximately 1
Question 16
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How much power does an electronic equipment consume, assuming a 5.50 amperes current flowing and
a 120 volts power source?
Select one:
a. 60 watts
b. 66 watts
c. 660 watts
d. 125.5 watts
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The correct answer is: 660 watts
Question 17
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In an R-C circuit across a d. c voltage source, which of the following is zero at the beginning of the
transient?
Select one:
a. charging current
b. drop across R
c. capacitor voltage
d. none of the above
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The correct answer is: capacitor voltage
Question 18
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An ac device used to measure the angle between the voltage and its current.
Select one:
a. phase angle meter
b. power factor meter
c. demand meter
d. reactive meter
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The correct answer is: power factor meter
Question 19
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A 24 volts battery delivers 15 amp to a motor load in 30 minutes per day. What is the energy delivered
per month in kWh?
Select one:
a. 6.2
b. 7.31
c. 5.4
d. 0.18
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The correct answer is: 5.4
Question 20
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If a current of 5A flowing in a coil of inductance 0.1 H is reversed in 10 ms, e.m.f. induced in it is ____
volt.
Select one:
a. 10,000
b. 100
c. 50
d. 1
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The correct answer is: 100
Question 21
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The phase b voltage and the phase b current of a balanced 3-phase system are: v = 220 sin (wt + 210
deg) and i = 10 sin (wt - 180 degrees). What is the power of the system?
Select one:
a. 3300 W
b. 3810 W
c. 1905 W
d. 5716 W
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The correct answer is: 1905 W
Question 22
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A parallel plate capacitor with air between its plates is charged until the potential difference V appears
across it. Another capacitor having hard rubber (dielectric constant = 3) between its plates but otherwise
identical, is also charged to the same potential difference. If the energy of the first capacitor is W, that of
the second is
Select one:
a. W/3
b. 9W
c. W
d. 3W
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The correct answer is: 3W
Question 23
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An RLC series circuit has f1 and f2 as the half power frequencies and f0 as the resonant frequency. The
Q-factor of the circuit is given by:
Select one:
a. (f1 - f0)/(f2 - f0)
b. f0/(f1 - f2)
c. (f1 + f2)/(2f0)
d. (f1 - f2)/f0
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The correct answer is: f0/(f1 - f2)
Question 24
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Electric power is almost exclusively generated, transmitted and distributed, by three phase system
because it
Select one:
a. all of the above
b. costs less than single-phase apparatus
c. it is more efficient
d. uses less material for a given capacity
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The correct answer is: all of the above
Question 25
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What is the relationship between frequency and the value of XC?
Select one:
a. frequency has no effect
b. XC varies directly with frequency
c. XC varies indirectly with frequency
d. XC varies inversely with frequency
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The correct answer is: XC varies inversely with frequency
Question 26
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The Meralco test of a 10 A wattmeter having a constant of 0.4, the disk makes 40 revolutions in 53.6
seconds. The average volts and amperes during the period of test are 116 volts and 9.4 A. What is the
percent accuracy of the meter at this load?
Select one:
a. 98.58%
b. 97.45%
c. 98.07%
d. 96.44%
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The correct answer is: 98.58%
Question 27
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A 0 - 10 mA galvanometer with a coil resistance of 20 ohms is converted to a 0 - 50 V galvanometer using
Select one:
a. 50 ohms shunt resistor
b. 4980 ohms series resistor
c. 5020 ohms series resistor
d. 5000 ohms series resistor
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The correct answer is: 4980 ohms series resistor
Question 28
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What type of tube is used to display signals on an oscilloscope?
Select one:
a. Filament tube
b. Pentode
c. Tetrode
d. Cathode-ray tube
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The correct answer is: Cathode-ray tube
Question 29
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In a parallel RC circuit,
Select one:
a. VC and IR are 90 degrees out of phase
b. VC and IR are in phase
c. IC and IR are in phase
d. VC and IC are in phase
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The correct answer is: VC and IR are in phase
Question 30
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Three equal impedances, each having a resistance of 8 ohms and an inductive reactance of 7 ohms are
connected in delta to lines a, b and c of a 240 V, 3-phase, 3-wire line, phase sequence a-b-c. What is the
reading of a single-phase wattmeter connected with its current coil in line a and the potential coil across
lines b and c?
Select one:
a. 6,324 W
b. 6,561 W
c. 6,180 W
d. 6,004 W
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The correct answer is: 6,180 W
Question 31
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According to Gauss theorem, the surface integral of the normal component of the electric flux density D
over a closed surface containing charge Q is
Select one:
a. Q*(permittivity of free space)
b. Q^2/(permittivity of free space)
c. Q/(permittivity of free space)
d. Q
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The correct answer is: Q
Question 32
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The fact that the sum of the individual branch currents equals the total current in a parallel circuit is the
basis for
Select one:
a. Kirchhoff Current Law
b. node voltage analysis
c. the method of mesh currents
d. Kirchhoff Voltage Law
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The correct answer is: Kirchhoff Current Law
Question 33
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Two electrons in a vacuum experience a force of 2 x 10^-15 N. How far apart are the electrons?
Select one:
a. 2.84 x 10^-12 m
b. 5.05 x 10^-12 m
c. 3.39 x 10^-7 m
d. 0.48 x 10^-7 m
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The correct answer is: 3.39 x 10^-7 m
Question 34
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How is an ammeter connected to the circuit under test?
Select one:
a. In parallel
b. In series
c. Shunted
d. Series-parallel
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The correct answer is: In series
Question 35
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To double the current range of a 50-micro-amp, 2 kilo-ohm moving coil meter movement, the shunt
resistance should be
Select one:
a. 18 kilo-ohms
b. 2 kilo-ohms
c. 50 kilo-ohms
d. 1 kilo-ohm
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The correct answer is: 2 kilo-ohms
Question 36
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An electronic/electrical component/device used to store electrical energy.
Select one:
a. Inductor
b. Resistor
c. lightning arrester
d. Capacitor
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The correct answer is: Capacitor
Question 37
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If three shielded 100 mH coils are connected in series, what is the total effective inductance?
Select one:
a. 67.777 mH
b. 33.333 mH
c. 300 mH
d. 100 mH
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The correct answer is: 300 mH
Question 38
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Four capacitors A, B, C and D are connected across a 15-V DC source. The charges accumulated in A, B
and C are equal to 2000, 750 and 1500 uC, respectively. If the total capacitance of the combination is
known to be 35 uF, how much charge is accumulated in capacitor D?
Select one:
a. 1500 uC
b. 1200 uC
c. 1400 uC
d. 1000 uC
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The correct answer is: 1000 uC
Question 39
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A solenoid has an inductance of 1.58 mH. How many turns of wire does it have if the solenoid is 25 cm
long and its radius is 2.5 cm?
Select one:
a. 400 turns
b. 160,000 turns
c. 350 turns
d. 600 turns
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The correct answer is: 400 turns
Question 40
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The type of cell commonly referred to as flashlight battery
Select one:
a. Dry cell
b. Mercury cell
c. Nickel-cadmium battery
d. Lead acid cell
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The correct answer is: Dry cell
Question 41
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In addition to supporting the moving coil, the aluminum bobbin in a permanent moving coil meter performs
the function of one of the following. Which one is this?
Select one:
a. reduce the reluctance
b. conducts magnetic flux lines
c. dampens the needle movement
d. balance the pointer
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The correct answer is: dampens the needle movement
Question 42
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To test the accuracy of a kilowatt-hour meter an electrician used a wattmeter. He found out that the meter
makes 5 revolutions in 18 seconds. The meter constant is 3.2. What is the percentage error if the
wattmeter reading is 3368?
Select one:
a. 5% faster
b. 8% faster
c. 8% slower
d. 5% slower
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The correct answer is: 5% slower
Question 43
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If a force of 4.8 x 10^(-2) N is required to move a 40 uC charge in an electric field between two points 20
cm apart. What is the potential difference between two points?
Select one:
a. 240 Volts
b. 360 Volts
c. 160 Volts
d. 120 Volts
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The correct answer is: 240 Volts
Question 44
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A lead circuit has a phase angle that is
Select one:
a. Greater than 90 degrees
b. The same as the input voltage
c. Between 0 and +90 degrees
d. Between 0 and -90 degrees
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The correct answer is: Between 0 and +90 degrees
Question 45
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If a current of 5 A flows through a long wire of radius 0.004 meter, what is the magnetic intensity
produced 0.02 meter away from the surface of the wire?
Select one:
a. 66.34 AT/m
b. 19.70 AT/m
c. 33.17 AT/m
d. 39.80 AT/m
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The correct answer is: 39.80 AT/m
Question 46
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What is the effect of connecting battery cells in parallel?
Select one:
a. Voltage decreases
b. Voltage increases
c. Current decreases
d. Current increases
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The correct answer is: Current increases
Question 47
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The value of temperature coefficient of resistance at 0 degrees C of a conductor is 1/236 per degree C.
Its value at 18 degrees will be ____.
Select one:
a. 1/218 per degree C
b. 1/254 per degree C
c. 1/272 per degree C
d. none of the above
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The correct answer is: 1/254 per degree C
Question 48
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Which of the given below can produce the most induced voltage?
Select one:
a. 1 A, 60 Hz
b. 1 A, 400 Hz
c. 50 A, DC
d. 1 A, 800 Hz
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The correct answer is: 1 A, 800 Hz
Question 49
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It exists in the space surrounding a magnet
Select one:
a. potential space
b. magnetic pole
c. magnetic space
d. magnetic field
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The correct answer is: magnetic field
Question 50
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It is that property of a material which enables it to attract pieces of iron.
Select one:
a. permitivity
b. valence
c. ionization
d. magnetism
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The correct answer is: magnetism
