1. Frictional force developed is 10.

In a centrifugal pump, the static lift means

(A) directly proportional to Aron of contact (A) suction lift
(B) inversely proportional to area of contact (B) delivery lift
(C) Independent of arca of contact (C) sum of suction and delivery lifts
(D) inversely proportional to the square of area of (D) difference of suction and delivery lifts
2. If one end of a beam is fixed and the other end is tree, then it is known as 11. By the two-wattmeter method, the three-phase power can be measured
(A) cantilever beam for
(B) simply supported beam (A) a balanced load
(C) overhanging beam (B) an unbalanced load
(D) fixed beam (C) both balanced and unbalanced loads
3. A displacement of a particle is given by S=(5t 2-3) m, the velocity of the (D) none of the nove
particle at 4 sec is 12. During resonance in a series circuit
(A) 77/4 m/s (A) current and voltage are in phase
(B) 40 m/ s (B) current and voltage are in opposite phase
(C) 80 m/s (C) current leads the voltage
(D) 5 m/s (D) voltage loads the current
4. The unit of impulse is 13. A capacitor with initial charge Q acts as
(A) kg ml. (A) short circuit
(B) Kg m/s (B) open circuit
(C) Kg /m/s (C) voltage source
(D) none of the above (D) diode
5. Ally wheel 1m in diameter accelerates uniformly from rent to 1000rp.m. in 14. If the form factor of a wave is 1.11, the nature of the wave is
20. What is its angular acceleration? (A) sinusoidal
(A) 50 rad/s2 (B) triangular
(B) 4.75 rad/s2 (C) saw-tooth
(C) 200 rad/s2 (D) square
(D) 5.236 rad/s2 15. The time constant of an RC series circuit connected to a d.c. source is
6. If A is the cross-sectional area of a pipe and V is the average velocity of (A) R/C
fluid flowing through it, the rate of flow or discharge Q is found by the (B) RC
following relation: (C) C/R
(A) A.V (D) C-R
(B) A2V 16. f(x) = x2 + x sin x is
(C) AV2 (A) an odd function
(D) A/2.V (B) an even function
7. Pitot tube is used for measurement of (C) constant function
(A) pressure (D) a periodic function
(B) flow 21. Which of the following statement is not true hole?
(C) velocity at a point (A) Holes may constitute an electric current
(D) discharge (B) holes can be considered as a net + ve charge
8. Reynolds number is defined as the (C) Holes can exist in certain semiconductor materials only
(A) ratio of the inertia force to gravity force (D) Holes can exist in any material including conductors
(B) ratio of the viscous force to gravity force 22. The temperature coefficient of an intrinsic semiconductor is
(C) ratio of the viscous force to elastic force (A) zero .
(D) ratio of the inertia force to viscous force (B) positive
9. In a reciprocating pump (C) negative
(A) flow is intermittent (D) like that of metals
(B) flow is uniform 23. As compared to a full wave rectifier using two diode, the four diode
(C) priming is essential bridge rectifier has the dominant Advantage of
(D) torque is uniform (A) higher current rating
(B) lower peak inverse voltage (C) equal to output impedance
(C) lower ripple factor (D) it can be anything
(D) higher efficiency 33. Thermal run away is not possible in FET because as the temperature of
24. Forward biasing of a p-n junction FET increases
(A) reduces the majority carrier current to zero (A) the mobility decreases
(B) reduces the minority carrier current to zero (B) the transconductance increases
(C) raises the potential barrier (C) the drain current increases
(D) reduces the potential barrier (D) none of the above
25. Zener diode is usually operated 34. A differential amplifier has a differential gain ne 20.000. CMRR = 80 dB.
(A) in forward bias mode The common mode gain is given by
(B) in reverse bias mode (A) 2
(C) in forward linear region (B) 1
(D) near cut-in voltage (C) ½
26. Silicon devices are preferred at high temperature operations in (D) O
comparison to germanium because 20 = 204.9
(A) reverse saturation current is less in case silicon 35. Most of the linear ICS are based on the two transistor differential amplifier
(B) silicon is more thermally stable because of its
(C) silicon can dissipate more power (A) input voltage dependent linear transfer characteristic
(D) none of the above (B) high voltage gain
27. The mobility of an electron in a conductor is expressed in terms of (C) high input resistance
(A) cm2/VS (D) high CMRR
(B) cm/VS 36. Power input to a transformer on no-load at rated voltage comprises
(C) cm2/V predominantly
(D) cm2/S (A) copper loss
28. In a common emitter amplifier. the unbypassed emitter resistance (B) hysteresis loss
provides (C) core loss
(A) voltage-shunt feedback (D) eddy current loss
(B) current-series feedback 37. A single phase transformer when supplied from a 220 V, 50 Hz source has
(C) negative voltage feedback eddy current loss of 50 W. If the transformer is connected to a 330 V, 50 Hz
(D) positive current feedback source. the eddy current loss will be
29. The pain of a voltage follower is (A) 168-75 W
(A) greater than 1 (B) 112.5 W
(B) exactly equal to 1 (C) 775 W
(C) slightly less than 1 (D) 50 W
(D) zero 38. A transformer core is laminated
30. The circuit arrangement of a transistor used as a buffer is (A) to reduce hysteresis loss
(A) CE (B) to provide flexibility to construction
(B) CB (C) to reduce eddy current loss
(C) CC (D) to reduce copper loss
(D) none of the above 39. Negative voltage regulation of a transformer is Possible with
31. If the input a.c. is 10 V (r.m.s.), the maximum voltage that will appear (A) inductive load
across the diode of a half-wave rectilier with a capacitor input filter will be (B) capacitive load
(A) 10 V (C) resistive load
(B) 14 V (D) resistive-inductive load
(C) 20 V 40. Distribution transformers are designed to have maximum efficiency
(D) 28 V nearly at
32. In a power amplifier load resistance should be (A) 100% of full load
(A) as small as possible (B) 50% of full load
(B) as large as possible (C) 25% of full loud
(D) 10% of full load 149. A three-phase slip ring induction motor is fed from the rotor side with
41. A d.c. shunt generator delivers 395 A al 250 V and the resistance of the stator winding short circuited. The frequency of the currents flowing in the
shunt field and armature are 50Ωand 0.05 Ωrespectively. The generated short circuited stator is
e.m.f. will be (A) slip frequency
(A) 269.75 V (B) supply frequency
(B) 270 v (C) zero
(C) 220 V (D) frequency corresponding to rotor speed
(D) 230-25 V 50. An induction motor having full load torque 60 Nm when delta connected
42. In a d.c. machine the angle between the stator field and rotor field is develops a starting torque of 120 Nm. For the same supply voltage. if the
(A) 45° motor changed to star connection, the starting torque developed will be
(B) 90° (A) 40 N-m
(C) 180°. (B) 60 Nm
(D) dependent upon the load (C) 90 Nm
43. Shunt field winding of a d.c. machine consists of (D) 120 Nm
(A) many turns of thin wire 51. The maximum possible speed at which an altern can be driven to
(B) many turns of thick wire generate 50 Hz and 1000 V is
(C) few turns of thick wire (A) 4000 r.p.m.
(D) few turns of thin wire (B) 3600 r.p.m.
44. In a 4-pole, 25 KW, 200 V wave wound d.c. shunt generator the current in (C) 3000 r.p.m.
each parallel path will be (D) 1500 r.p.m.
(A) 62-5 A 52. if Xd = d-axis synchronous reactance, Xq= q-axis synchronous reactance
(B) 125 A in a salient pole synchronous machine
(C) 31.25 A (A) Xd > Xq
(D) 250 A (B) Xd = Xq
45. A d.c. series motor develops a torque of 20 Nm at 3 A of load current. If (C) Xd < Xq
the current is increased to 6 A, the torque developed will be (D) Xq=0
(A) 10 Nm 53. in synchoromus generator is operating at constant speed while its
(B) 20 Nm excitation is adjusted to give unity p.f. current. If the excitation is halved the
(C) 40 Nm power factor will be
(D) 80 Nm (A) lead
46. A 3-phase, 400 V. 4-pole induction motor is fed from a 3-phase 400 V.50 (B) lagging
Hz supply and runs at 1440r.p.m. The frequency of rotor e.m.f.is (c) remain unity
(A) 2 Hz (D) become zero
(B) 4 Hz 54. A salient pole synchronous inter is running with normal excitation. If the
(C) 4.8 Hz excitation is reduced to zero
(D) 5.2 Hz (A) it becomes an induction motor
37. A 3-phase induction motor is operating a slip S. 1! any two supply leads (B) it becomes a reluctance motor
are interchanged, then its slip at the instant will be (C) it remains a synchronous motor
(A) 1-S (D) it does not develop any torque
(B) 1+S 55. In a capacitor start single phase induction motor, capacitor of suitable
(C) 2-S value is connected
(D) 2 +S (A) in series with the auxiliary winding
48. The number of sliprings on a squirrel cage induction motor is (B) across the auxiliary winding
(A) 4 (C) across the main winding
(B) 3 (D) in series with the main winding
(C) 2 56. Third pin in a 3-pin plug is provided so as to
(D) none of the above (a) provide an earth connection (B) provide a 3-phase supply, when required
IC) provide a spare phase, when required D) prevent a plug being reversed in
the socket
57. The thickness of insulation provided on the conductor depends upon (A) √ 2 V KV
(A) current rating (B) √ 3 V KV
(B) voltage rating
(C) 3 VKV
(C) both (A) and (B)
(D) none of the above (D) 1/√ 3 KV
58. Which of the following mixtures is preferred for filling around the earth 66. The breakdown stress of atmospheric air is approximately
electrode for having effective earthing? (A) 0-3 KV/cm
(A) Charcoal-salt (B) 3 KV/cm
(B) Lime-sand (C) 30 KV/cm
(C) Sawdust-sand (D) 300 KV/cm
(d)) Silicagel-sand 67. The surge impedance of 50 mile long underground cable is 50 ohms. For a
59. In a distribution system which of the for items shares the major cost 25 mile long cable, surge impedance will be
(A) Conductors (A) 25 ohm
(B) Earthing system (B) 50 ohm
(C) Distribution transformer (C) 100 ohm
(D) insulators (D) 200 ohm
60. Non metallic conduits used in internal wiring are generally made of 68. If the fault current is 2000 A, the relay setting is 50% and the C.T. ratio is
(A) wood 400/5, the plug setting multiplier will be
(B) rubber (A) 5
(C) PVC (B) 7
(D) cork (C) 8
61. A power system network with a capacity of 100 MVA has a source (D) 10
impedance of 10% at a point. The fault at that point is 69. The rate of rise of restriking voltage depends upon
(A) 10 MVA (A) the type of Circuit Breaker
(B) 30 MVA (B) the inductance of the system only
(C) 3000 MVA (C) the capacitance of the system only
(D) 1000 MVA (D) the inductance and capacitance of the system
62. When a line to ground fault occurs. the current in the faulty phase is 100 70. A 3-phase Circuit Breaker is rated at 2000 MVA. 33 KV: its making current
A. The zero sequence current in this case will be will be
(A) zero (A) 35 KA
(B) 33.33 A (B) 49 KA
(C) 66-66 A (C) 70 KA
(D) 100 A (D) 89 KA
63. Capacitance Voltage Transformer (CVT) is used to 71. An isolator operates under
(A) improve the power factor of transmission (A) fault condition
(B) reduce losses in a transmission line (B) no load condition
(C) connect instruments and relays on the LT side (C) full load condition
(D) reduce the incidence of over voltage surges (D) 50% load condition
64. The following sequence currents were recorded in a power system under 72. If two synchronous generators are connected loss of synchronism will
a fault condition: result in
I positive =j 1.653 p.u.; Inegetive = -j 0:5 p.u.; Izero = -1.153 p.u. The fault is (A) stalling of generators
(A) line to ground (B) wild fluctuations in current
(B) three phase (C) wild fluctuations in current and voltage
(C) line to line (D) none of the above
(D) line to line to ground 73. A 50 Hz. 4-pole turbo-alternator rated at 20 MVA. 13.2 KV has an inertia
65. A single line to ground fault occurs on a 3-phase isolated neutral system constant H = 4 KW sec./KVA. The kinetic energy stored in the rotor at
with a line to neutral voltage of VKV. The potential of the healthy phases rises synchronous speed is
to a value (A) 80 KJ
(B) 80 M)
(C) 40 MJ (A) exhaust tube diameter IB) glass shell diameter se vapour pressure inside
(D) 20 MJ Di none of the above
74. For the protection of transformers. Harmonic restrain is used to guard 84. The luminous efficiency of GLS lamp is normally in ile range of
against (A) (100-150) lumens/walt
(A) magnetising in-rush current (B) (75-100) lumnes/walt
(B) unbalanced operation (C) (50-75) lumnes/watt
(C) lightning (D) 10-18) lumens/watt
(D) switching over voltage 85. The colour of light given out by a sodium vapour discharge lamp is
75. A line trap in a long transmission line is used to (A) pink
(A) improve power factor (B) flush green
(B) dampen over voltage oscillations (C) yellow
(C) confine carrier signals in the line (D) blue
(D) protect the line against 86. Parralloy is
76. Poisson's equation relating the potential V at any point to the volume (A) a variedly of stainless steel
change density p at that point states that (B) a polymer
(C) a p-ferrous alloy
(D) a nickel and iron alloy having high permeability
87. Dielectric materials are essentially
(A) insulating materials
77. Electric flux inside a conducting sphere is (B) conducting materials
(A) zero (C) semi-conducting material
(B) uniform (D) ferromagnetic material
(C) minimum 88. An intrinsic semi-conductor at absolute zero temperature behaves like
(D) maximum (A) a super conductor
78. The Electric field strength at any point equals (B) an insulator
(A) penitential gradient at that point (C) a conductor
(B) negative of the potential gradient at that point (D) a ferromagnetic material
(C) the charge at that point 89. Ferrites are
(D) negative of the charge at that point (A) not easily machinable
79. ln free space with p = 0. Poisson's equation is (B) hard materials
(A) continuity equation (C) brittle materials
(B) Laplacian’s equation (D) all of the above properties
(C) Maxwell curl equation 90. Metallic copper is a
(d) Maxwell divergence equation (A) paramagnetic substance
80. A very long conductor carries a current of 10 A. What is the field (B) at 10 (B) diamagnetic substance
cm from it? (C) ferroelectric material
(A) 2X10-5 Tesla (D) piezoelectric material
(B) 4X10-5 Tesla 91. Buck substitution is associated with
(C) 2X10-7 Tesla (A) Runge-Kutta method
(D) 4X10-7 Tesla (B) Lagrangian interpolation
81. The wave length of 5500 amstrong will give sight of (C) Gauss elimination method
(A) green colour (D) Gauss-Seidel iterative method
(B) red colour 92. In an ill-conditioned system of linear algebraic equations
(C) orange colour (A) small changes in the coefficients produce small changes in the solution
(D) yellow-green colour (B) large changes in the coefficients produce small changes in the solution
82. The illumination at a surface due to a source of light placed at a distance (C) small changes in the coefficients produce large changes in the solution
d' from the surface varies as (D) large changes in the coefficients produce large changes in the solution
AA (B Cid ID d 93. We wish to solve x2 - 2 = 0 by Newton-Raphson technique. Let the initial
83. The rate of evaporation of tungsten filament in a lamp depends upon guess be x0= 1.0; subsequent estimate of x (i.e. x) will be
(A) 1.414
(B) 1.5
(C) 2.0
(D) 3-383
94. A logical variable can have
(A) only one possible value
(B) only two possible values
(C) only four possible values
(D) infinite number of possible values
95. Sufficient condition for convergence of Gauss-Seidel iterative method for
solution of linear algebraic equations demands coefficient matrix to be a
(A) sparse matrix
(B) upper triangular matrix
(C) diagonally dominant matrix
(D) orthogonal matrix
96. A compiler converts
(A) an object code to a source code
(B) a source code to an object code
(C) an assembly language code to an object code
(D) an object code to an assembly language in
97. If two consecutive statements of a FORTRAN program are B = 0 and C =
A/B. we will encounter
(A) logical error (B) syntax error (C) runtime error (D) round off error
98. In FORTRAN DO construct is used
(A) to assign a value to a variable
(B) to take a decision
(C) to print a value
(D) to repeatedly execute a job
99. In a FORTRAN expression A.GT.B the operator GT is
(A) an arithmetic operator
(B) a logical operator
(C) a binary operator
(D) a relational operator
100. If a function is so developed that it calls itself then t is termed as
(A) main function
(B) library function
(C) recursive function
(D) statement function