ELECTRICAL ENGINEERING- PAGE 4
ELECTRICAL ENGINEERING MCQs- PAGE 4
1. Starting capacitor of single phase motor is
A) Electrolytic capacitor B) Ceramic capacitor
C) Oil filled paper capacitor D) None of these
Ans: A
2. The type of motor used in ceiling fan is
A) Split phase B) Capacitor start
C) Capacitor start capacitor run D) Permanent capacitor
Ans: D
3. Which one of the following motor will have lowest starting torque ?
A) Universal motor B) Shaded pole motor
C) Capacitor start capacitor run motor D) Repulsion induction motor
Ans: B
4. When the speed of alternator increases the frequency
A) Increases B) Decreases C) Remains same D) None of these
Ans: A
5. Salient pole type alternators are used in
A) Thermal power stations B) Hydro power stations
C) Nuclear power stations D) All of these
Ans: B
6. Which is the common method of cooling a power transformer ?
A) Air cooling B) Oil cooling C) Air-blast cooling D) Natural cooling
Ans: B
7. Iron losses of transformer are measured by
A) Low PF watt meter B) Unity PF watt meter
C) Volt meter D) KWH meter
Ans: A
8. A transformer is working at its maximum efficiency. Its core loss is 400 watts, its copper loss will be
A) 200 W B) 400 W C) 500 W D) 800 W
Ans: B
9. Change in DC excitation of a synchronous motor changes
A) Motor speed B) Applied voltage of the motor
C) PF of the motor D) All of these
Ans: C
10. Conduction in a JFET is always by the
A) Majority carriers B) Minority carriers
C) Holes D) Electrons
Ans: A
11. Which of the following transistors can be used in enhancement mode ?
A) UJT B) JFET C) MOSFET D) NPN transistor
Ans: C
12. Type of insulator used for holding for HT overhead conductor on straight running of poles
A) Post insulators B) Pin type insulator
C) Stay insulator D) Shackle insulator
Ans: B
13. The distance between two adjacent line poles is called
A) Sag B) Span C) Spacing D) All of these
Ans: B
14. Positive electrode of dry cell is made from
A) Copper B) Carbon C) Zinc D) Sulphur
Ans: B
15. Permeability is the measure of
A) The resistance of a metal
B) Flux of a magnet
C) Conductivity of a substance for magnetic lines of force
D) The sum of voltage drops around a magnet
Ans: C
16. Moving coil instrument usually have
A) Uniform scale throughout the range
B) Congested scale in the beginning
C) Congested scale in the end
D) None of these
Ans: A
17. Temperature limit of class E insulation is
A) 50 deg C B) 80 deg C C) 300 deg C D) 120 deg C
Ans: D
18. Most commonly used rectifier now a days are
A) Rotary converter B) Mercury arc rectifiers
C) Solid state diodes D) None of these
Ans: C
19. In an ideal transformer
A) Windings have no resistance B) Core has no losses
C) Core has infinite permeability D) All of these
Ans: D
20 KWH meter can be classified as
A) Deflecting instrument B) Digital instrument
C) Recording instrument D) Integrating instrument
Ans: D
21. Fixed coil in a dynamometer type Watt meter is
A) Pressure coil B) Current coil
C) Power coil D) Dynamic coil
Ans: B
A) Electrolytic capacitor B) Ceramic capacitor
C) Oil filled paper capacitor D) None of these
Ans: A
2. The type of motor used in ceiling fan is
A) Split phase B) Capacitor start
C) Capacitor start capacitor run D) Permanent capacitor
Ans: D
3. Which one of the following motor will have lowest starting torque ?
A) Universal motor B) Shaded pole motor
C) Capacitor start capacitor run motor D) Repulsion induction motor
Ans: B
4. When the speed of alternator increases the frequency
A) Increases B) Decreases C) Remains same D) None of these
Ans: A
5. Salient pole type alternators are used in
A) Thermal power stations B) Hydro power stations
C) Nuclear power stations D) All of these
Ans: B
6. Which is the common method of cooling a power transformer ?
A) Air cooling B) Oil cooling C) Air-blast cooling D) Natural cooling
Ans: B
7. Iron losses of transformer are measured by
A) Low PF watt meter B) Unity PF watt meter
C) Volt meter D) KWH meter
Ans: A
8. A transformer is working at its maximum efficiency. Its core loss is 400 watts, its copper loss will be
A) 200 W B) 400 W C) 500 W D) 800 W
Ans: B
9. Change in DC excitation of a synchronous motor changes
A) Motor speed B) Applied voltage of the motor
C) PF of the motor D) All of these
Ans: C
10. Conduction in a JFET is always by the
A) Majority carriers B) Minority carriers
C) Holes D) Electrons
Ans: A
11. Which of the following transistors can be used in enhancement mode ?
A) UJT B) JFET C) MOSFET D) NPN transistor
Ans: C
12. Type of insulator used for holding for HT overhead conductor on straight running of poles
A) Post insulators B) Pin type insulator
C) Stay insulator D) Shackle insulator
Ans: B
13. The distance between two adjacent line poles is called
A) Sag B) Span C) Spacing D) All of these
Ans: B
14. Positive electrode of dry cell is made from
A) Copper B) Carbon C) Zinc D) Sulphur
Ans: B
15. Permeability is the measure of
A) The resistance of a metal
B) Flux of a magnet
C) Conductivity of a substance for magnetic lines of force
D) The sum of voltage drops around a magnet
Ans: C
16. Moving coil instrument usually have
A) Uniform scale throughout the range
B) Congested scale in the beginning
C) Congested scale in the end
D) None of these
Ans: A
17. Temperature limit of class E insulation is
A) 50 deg C B) 80 deg C C) 300 deg C D) 120 deg C
Ans: D
18. Most commonly used rectifier now a days are
A) Rotary converter B) Mercury arc rectifiers
C) Solid state diodes D) None of these
Ans: C
19. In an ideal transformer
A) Windings have no resistance B) Core has no losses
C) Core has infinite permeability D) All of these
Ans: D
20 KWH meter can be classified as
A) Deflecting instrument B) Digital instrument
C) Recording instrument D) Integrating instrument
Ans: D
21. Fixed coil in a dynamometer type Watt meter is
A) Pressure coil B) Current coil
C) Power coil D) Dynamic coil
Ans: B
22. Unit for measurement of electric energy is
A) KW B) KwH C) Volt D) Volt ampere
Ans: B
23. When temperature of carbon increases, its resistance
A) Decreases B) Increases C) Remains same D) None of these
Ans: A
24. To decrease the resistance of any conductor, a resistance will be connected in
A) Series B) Series-parallel C) Parallel D) None of these
Ans: C
25. In India usually generating voltage is
A) 440 V B) 11000 V C) 33000 V D) 66000 V
Ans: B
26. In AC machines best efficiency is given by
A) Transformer B) Induction motor C) Slip ring motor D) Alternator
Ans: A
27. Interpoles are connected in
A) Series with armature B) Series with field C) Parallel with armature D) None of these
Ans: A
28. According to IE rules the permissible variation of frequency is
A) 5% B) 3% C) 8% D) 10%
Ans: B
29. In conduit wiring +ve and – ve wires are run in the same conduit to avoid
A) Capacitive effect B) Inductive effect C) Both effects D) None of these
Ans: D
30. The total capacitance of three condensers connected in series as C 1 = F 30 μ , C 2 = F 15 μ and C3 = F 20 μ
A) 6.66 F μ B) 65 F μ C) 9/60 F μ D) 80 F μ
Ans: A
31. Induction motor runs at
A) Synchronous speed B) Below Synchronous speed C) Above Synchronous speed D) None of these
Ans: B
32. Short pitch winding is used because it
A) Magnifies the voltage B) Saves copper of the end rings C) Improves the wave form of the induced EMF D) Magnifies current
Ans: B
33. Generally at unity PF the voltage regulation of an alternator is
A) Positive B) Negative C) Zero D) None of these
Ans: A
34. The rotating magnetic field in a 3 phase 6 pole 50 Hz slip ring induction motor will rotate at
A) 1000 rpm B) 1200 rpm
C) 1500 rpm D) 800 rpm
Ans: A
35. Alternating current can induce voltage because it has
A) High peak value B) Varying magnetic field C) Constant magnetic field D) None of these
Ans: B
36. In two watt meter method of power measurement if the PF is unity then
A) W 1 < W 2 B) W 1 > W 2 C) W 1 = W 2 D) W 2 = 0
Ans: C
37. Induction type watt meter can be used in
A) AC only B) DC only C) Both AC and DC D) None of these
Ans: A
38. Highest doped region in a transistor is
A) Emitter B) Collector
C) Base D) All are equally doped
Ans: A
39. No load test on a transformer is conducted to measure
A) Copper loss B) Core loss
C) Total loss D) Efficiency
Ans: B
40. Which starter will give better starting torque to squirrel cage induction motor
A) DOL starter B) Star-delta starter
C) Auto transformer starter D) None of these
Ans: A
41. Nichrome is widely used for
A) Heater coils B) Transformer winding
C) Filaments D) All of these
Ans: A
42. Unit of flux density is
A) Henry/m2 B) Webers/m2 C) Newton/m2 D) Ohms/m2
Ans: B
43. A material that is slightly repelled by a magnet is called
A) Paramagnetic material B) Diamagnetic material
C) Ferromagnetic material D) None of these
Ans: A
44. A substance that has high retentivity can be used for the manufacture of
A) Electromagnets B) Permanent magnets
C) Temporary magnets D) None of these
Ans: B
45. A moving iron ammeter reads 10 Amps. How much is the peak current of the oscillation ?
A) 7.07 A B) 1.414 A C) 70.7 A D) 14.14 A
Ans: D
46. If the frequency changes from 50 Hz to 100 Hz keeping voltage constant, the inductive reactance of coil connected to supply
A) Remains same B) Become half
C) Become doubled D) Become 4 times
Ans: C
47. The true power consumed by the pure inductor is
A) 0 watt B) 1 watt C) 2 watt D) 4 watt
Ans: A
48. Capacitance is not affected by
A) Plate area B) Distance between plates
C) Dielectric material D) Frequency
Ans: D
49. In a capacitive AC circuit
A) Current leads the voltage B) Voltage leads the current
C) Current is inphase with voltage D) Current lags the voltage
Ans: A
50. Synchronous motor when used for power factor improvement should be
A) Under excited B) Over excited
C) Loaded D) Running on no-load
Ans: B
51. To increase the ampere rating the cells are to be connected in
A) Series B) Parallel C) Series-parallel D) Parallel-series
Ans: B
52. The capacity of a cell is measured in
A) Volt-hour B) Volts C) Ampere D) Ampere-hours
Ans: D
53. The metal used for the control spring in electrical instrument is
A) Steel B) Nichrome
C) Hard drawn copper D) Phosphor bronze
Ans: D
54. Dynamo meter type meters are used to measure
A) Only AC quantities B) Only DC quantities
C) Both AC and DC D) Pulsating AC only
Ans: C
55. Megger is used to measure
A) Earth resistance B) Insulation resistance
C) Breakdown voltage of insulation D) Low resistance
Ans: B
56. Sweep of ceiling fan refers to
A) Radius of circle formed by its rotation
B) Double the length of blade
C) The distance from the center of motor to tip of blade
D) Double the distance from center of motor to tip of blade
Ans: D
57. What type of motor is used in a food mixer ?
A) DC shunt motor B) Universal motor
C) Capacitor start motor D) Shaded pole motor
Ans: B
58. The unit of luminous flux is
A) Candela B) Steradian C) Lux D) Lumen
Ans: D
59. Which of the following is the most efficient as a light source ?
A) Tungsten filament B) Black body
C) Carbon filament D) None of these
Ans: A
60. The gas inside the inner discharge tube of a sodium vapour lamp is
A) Argon B) Neon C) Helium D) Hydrogen
Ans: B
61. How many light points are allowed in one circuit ?
A) 10 points B) 15 points C) 20 points D) Any number
Ans: A
62. The holes on the aluminium disc of an energy meter helps to
A) Prevent creeping B) Reducing resistance
C) Reduce the weight of disc D) Increase the torque
Ans: A
63. Fuse rating is expressed in terms of
A) Voltage B) Current C) kVA D) VAR
Ans: B
64. Fusing factor of HRC fuses will be
A) 1.1 B) 1.4 C) 1.6 D) 1.7
Ans: A
65. In this wiring two lamps should be switched ON at a time
A) Godown wiring B) Tunnel wiring C) Corridor wiring D) Hostel wiring
Ans: B
66. Induced EMF in the armature of a DC generator is basically
A) An alternating current B) A direct current
C) An oscillating current D) None of these
Ans: A
67. Flemings Right hand rule is used to identify the
A) Direction of flux B) Direction of rotation in a generator
C) Direction of current in a motor D) Direction of induced EMF
Ans: D
68. Insulating material used in between commutator segment is
A) Varnish B) Empire cloth C) Mica D) Film paper
Ans: C
69. Lap winding is made in a machine for
A) High current high voltage B) Low voltage low current
C) High voltage low current D) High current low voltage
Ans: D
70. Back EMF of a DC motor
A) Opposes the supply EMF B) Aids the supply EMF
C) Does not affect the armature current D) Aids in increasing the supply current
Ans: A
71. Insulation resistance is measured in
A) Mega watts B) Mega ohms
C) Kilo amps D) Kilo volts
Ans: B
72. By setting the brush position exactly at magnetic neutral axis we get
A) Maximum induced EMF B) Sparkless commutation
C) Best performance D) All of the above
Ans: D
73. The magnetic field produced in the stator of a three phase induction motor travels at
A) Rotating speed B) Asynchronous speed
C) Synchronous speed D) Slip speed
Ans: C
74. The purpose of a back-up fuse is to provide protection against
A) Over load B) Under load C) High voltage D) Short circuit
Ans: D
75. Jogging operation is also called as
A) Starting B) Stopping C) Braking D) Inching
Ans: D
76. While running, the rotor frequency in a 3 phase induction motor is equal to
A) Stator frequency
B) (Stator frequency)/slip
C) Stator frequency × slip
D) None of these
Ans: C
A) KW B) KwH C) Volt D) Volt ampere
Ans: B
23. When temperature of carbon increases, its resistance
A) Decreases B) Increases C) Remains same D) None of these
Ans: A
24. To decrease the resistance of any conductor, a resistance will be connected in
A) Series B) Series-parallel C) Parallel D) None of these
Ans: C
25. In India usually generating voltage is
A) 440 V B) 11000 V C) 33000 V D) 66000 V
Ans: B
26. In AC machines best efficiency is given by
A) Transformer B) Induction motor C) Slip ring motor D) Alternator
Ans: A
27. Interpoles are connected in
A) Series with armature B) Series with field C) Parallel with armature D) None of these
Ans: A
28. According to IE rules the permissible variation of frequency is
A) 5% B) 3% C) 8% D) 10%
Ans: B
29. In conduit wiring +ve and – ve wires are run in the same conduit to avoid
A) Capacitive effect B) Inductive effect C) Both effects D) None of these
Ans: D
30. The total capacitance of three condensers connected in series as C 1 = F 30 μ , C 2 = F 15 μ and C3 = F 20 μ
A) 6.66 F μ B) 65 F μ C) 9/60 F μ D) 80 F μ
Ans: A
31. Induction motor runs at
A) Synchronous speed B) Below Synchronous speed C) Above Synchronous speed D) None of these
Ans: B
32. Short pitch winding is used because it
A) Magnifies the voltage B) Saves copper of the end rings C) Improves the wave form of the induced EMF D) Magnifies current
Ans: B
33. Generally at unity PF the voltage regulation of an alternator is
A) Positive B) Negative C) Zero D) None of these
Ans: A
34. The rotating magnetic field in a 3 phase 6 pole 50 Hz slip ring induction motor will rotate at
A) 1000 rpm B) 1200 rpm
C) 1500 rpm D) 800 rpm
Ans: A
35. Alternating current can induce voltage because it has
A) High peak value B) Varying magnetic field C) Constant magnetic field D) None of these
Ans: B
36. In two watt meter method of power measurement if the PF is unity then
A) W 1 < W 2 B) W 1 > W 2 C) W 1 = W 2 D) W 2 = 0
Ans: C
37. Induction type watt meter can be used in
A) AC only B) DC only C) Both AC and DC D) None of these
Ans: A
38. Highest doped region in a transistor is
A) Emitter B) Collector
C) Base D) All are equally doped
Ans: A
39. No load test on a transformer is conducted to measure
A) Copper loss B) Core loss
C) Total loss D) Efficiency
Ans: B
40. Which starter will give better starting torque to squirrel cage induction motor
A) DOL starter B) Star-delta starter
C) Auto transformer starter D) None of these
Ans: A
41. Nichrome is widely used for
A) Heater coils B) Transformer winding
C) Filaments D) All of these
Ans: A
42. Unit of flux density is
A) Henry/m2 B) Webers/m2 C) Newton/m2 D) Ohms/m2
Ans: B
43. A material that is slightly repelled by a magnet is called
A) Paramagnetic material B) Diamagnetic material
C) Ferromagnetic material D) None of these
Ans: A
44. A substance that has high retentivity can be used for the manufacture of
A) Electromagnets B) Permanent magnets
C) Temporary magnets D) None of these
Ans: B
45. A moving iron ammeter reads 10 Amps. How much is the peak current of the oscillation ?
A) 7.07 A B) 1.414 A C) 70.7 A D) 14.14 A
Ans: D
46. If the frequency changes from 50 Hz to 100 Hz keeping voltage constant, the inductive reactance of coil connected to supply
A) Remains same B) Become half
C) Become doubled D) Become 4 times
Ans: C
47. The true power consumed by the pure inductor is
A) 0 watt B) 1 watt C) 2 watt D) 4 watt
Ans: A
48. Capacitance is not affected by
A) Plate area B) Distance between plates
C) Dielectric material D) Frequency
Ans: D
49. In a capacitive AC circuit
A) Current leads the voltage B) Voltage leads the current
C) Current is inphase with voltage D) Current lags the voltage
Ans: A
50. Synchronous motor when used for power factor improvement should be
A) Under excited B) Over excited
C) Loaded D) Running on no-load
Ans: B
51. To increase the ampere rating the cells are to be connected in
A) Series B) Parallel C) Series-parallel D) Parallel-series
Ans: B
52. The capacity of a cell is measured in
A) Volt-hour B) Volts C) Ampere D) Ampere-hours
Ans: D
53. The metal used for the control spring in electrical instrument is
A) Steel B) Nichrome
C) Hard drawn copper D) Phosphor bronze
Ans: D
54. Dynamo meter type meters are used to measure
A) Only AC quantities B) Only DC quantities
C) Both AC and DC D) Pulsating AC only
Ans: C
55. Megger is used to measure
A) Earth resistance B) Insulation resistance
C) Breakdown voltage of insulation D) Low resistance
Ans: B
56. Sweep of ceiling fan refers to
A) Radius of circle formed by its rotation
B) Double the length of blade
C) The distance from the center of motor to tip of blade
D) Double the distance from center of motor to tip of blade
Ans: D
57. What type of motor is used in a food mixer ?
A) DC shunt motor B) Universal motor
C) Capacitor start motor D) Shaded pole motor
Ans: B
58. The unit of luminous flux is
A) Candela B) Steradian C) Lux D) Lumen
Ans: D
59. Which of the following is the most efficient as a light source ?
A) Tungsten filament B) Black body
C) Carbon filament D) None of these
Ans: A
60. The gas inside the inner discharge tube of a sodium vapour lamp is
A) Argon B) Neon C) Helium D) Hydrogen
Ans: B
61. How many light points are allowed in one circuit ?
A) 10 points B) 15 points C) 20 points D) Any number
Ans: A
62. The holes on the aluminium disc of an energy meter helps to
A) Prevent creeping B) Reducing resistance
C) Reduce the weight of disc D) Increase the torque
Ans: A
63. Fuse rating is expressed in terms of
A) Voltage B) Current C) kVA D) VAR
Ans: B
64. Fusing factor of HRC fuses will be
A) 1.1 B) 1.4 C) 1.6 D) 1.7
Ans: A
65. In this wiring two lamps should be switched ON at a time
A) Godown wiring B) Tunnel wiring C) Corridor wiring D) Hostel wiring
Ans: B
66. Induced EMF in the armature of a DC generator is basically
A) An alternating current B) A direct current
C) An oscillating current D) None of these
Ans: A
67. Flemings Right hand rule is used to identify the
A) Direction of flux B) Direction of rotation in a generator
C) Direction of current in a motor D) Direction of induced EMF
Ans: D
68. Insulating material used in between commutator segment is
A) Varnish B) Empire cloth C) Mica D) Film paper
Ans: C
69. Lap winding is made in a machine for
A) High current high voltage B) Low voltage low current
C) High voltage low current D) High current low voltage
Ans: D
70. Back EMF of a DC motor
A) Opposes the supply EMF B) Aids the supply EMF
C) Does not affect the armature current D) Aids in increasing the supply current
Ans: A
71. Insulation resistance is measured in
A) Mega watts B) Mega ohms
C) Kilo amps D) Kilo volts
Ans: B
72. By setting the brush position exactly at magnetic neutral axis we get
A) Maximum induced EMF B) Sparkless commutation
C) Best performance D) All of the above
Ans: D
73. The magnetic field produced in the stator of a three phase induction motor travels at
A) Rotating speed B) Asynchronous speed
C) Synchronous speed D) Slip speed
Ans: C
74. The purpose of a back-up fuse is to provide protection against
A) Over load B) Under load C) High voltage D) Short circuit
Ans: D
75. Jogging operation is also called as
A) Starting B) Stopping C) Braking D) Inching
Ans: D
76. While running, the rotor frequency in a 3 phase induction motor is equal to
A) Stator frequency
B) (Stator frequency)/slip
C) Stator frequency × slip
D) None of these
Ans: C
77. The most commonly used wiring system in electrical wiring installation is __________.
(A) Tree system (B) Ring main system
(C) Distribution system (D) None of these
Ans: C
78. The mettalic sheath is provided in cables to safeguard against __________.
(A) Mechanical injury (B) Moisture content
(C) Rusting (D) Serving
Ans: B
79. A device which opens or closes an auxiliary circuit under predetermined conditions in the main circuit is __________.
(A) Relay (B) Circuit breaker (C) Switch (D) Fuse
Ans: A
80. The most common method to test the armature winding for short and open coils is __________.
(A) Insulation resistance test (B) Drop test
(C) Growler test (D) Ground test
Ans: C
81. The maximum reverse voltage that a diode can withstand is referred as __________.
(A) Peak inverse voltage (B) Barrier voltage
(C) Threshold voltage (D) Knee voltage
Ans: A
82. The full load copper loss of a transformer is 400 W. The Copper loss at half load will be __________.
(A) 100 W (B) 100 kW (C) 200 W (D) 800 W
Ans: A
83. In a wiring two lamps should be switched ‘ON’ at a time, the wiring is known as __________.
(A) Corridor wiring (B) Godown wiring (C) Hostel wiring (D) Tunnel wiring
Ans: D
84. ELCB’s are specially used to disconnect the supply under __________ conditions.
(A) Open circuit (B) Over load (C) Short circuit (D) None of these
Ans: D
85. The maximum safe temperature of class B insulation material is __________.
(A) 1308C (B) 1058C (C) 908C (D) 1208C
Ans: A
86. The controlling torque in an indicating instrument is __________.
(A) Decreases with the deflection of moving system
(B) Opposes the deflection torque
(C) Proportional to supply voltage
(D) None of these
Ans: B
87. Form Factor is defined as ratio :
(A) Average Value /RMS Value
(B) RMS Value/ Average Value
(C) RMS Value/Maximum Value
(D) Maximum Value/RMS Value
Ans: B
88. The damping torque provided by PMMC Instruments is __________.
(A) Air friction damping (B) Fluid friction damping (C) Eddy current damping (D) None of these
Ans: C
89. When the motor is stationary, the frequency of rotor current in an Induction motor is __________.
(A) Same as the supply frequency (B) Depends upon slip (C) Depends upon synchronous speed (D) None of these
Ans: A
90. Kirchoff’s voltage law is concerned with __________.
(A) IR drops (B) Battery emf’s (C) Junction voltages (D) Both (A) and (B)
Ans: D
91. A charge of 100 coulomb is transferred in a circuit by a current of 1A. Time taken by this current is __________ seconds.
(A) 1 (B) 10 (C) 100 (D) 1000
Ans: C
92. The voltage induced in the armature of a dc generator is __________.
(A) Pulsating dc (B) DC (C) Rectified ac (D) AC
Ans: D
93. The connection of a Zener diode in a circuit is always __________.
(A) Forward biased (B) In series (C) Reverse biased (D) Positively biased
Ans: C
94. The positive plate of lead acid cell is __________.
(A) Lead peroxide (B) Sponge lead (C) Lead sulphate (D) Pottasium hydroxide
Ans: A
95. The starting winding of a resistance start induction motor have __________.
(A) Low resistance and higher reactance (B) High resistance and low reactance
(C) Low resistance and low reactance (D) High resistance and high reactance
Ans: B
96. In a lap winding, the number of brushes required is equal to __________.
(A) Number of poles (B) No of pair of poles
(C) Pole pitch (D) 2
Ans: A
97. The open circuit test on a transformer is always made on __________.
(A) High voltage winding (B) Low voltage winding
(C) Either (A) or (B) (D) None of these
Ans: B
98. In a parallel circuit, all components must __________.
(A) have same potential difference across them
(B) have the same value
(C) carry the same current
(D) none of these
Ans: A
99. For a given dc generator the generator voltage depends on __________.
(A) Flux only (B) Speed only
(C) Both Flux and Speed (D) None of these
Ans: C
100. The test is conducted to check whether switches are connected in phase/live cables or not is __________.
(A) Continuity test (B) Ground test
(C) Open circuit test (D) Polarity test
Ans: D
(A) Tree system (B) Ring main system
(C) Distribution system (D) None of these
Ans: C
78. The mettalic sheath is provided in cables to safeguard against __________.
(A) Mechanical injury (B) Moisture content
(C) Rusting (D) Serving
Ans: B
79. A device which opens or closes an auxiliary circuit under predetermined conditions in the main circuit is __________.
(A) Relay (B) Circuit breaker (C) Switch (D) Fuse
Ans: A
80. The most common method to test the armature winding for short and open coils is __________.
(A) Insulation resistance test (B) Drop test
(C) Growler test (D) Ground test
Ans: C
81. The maximum reverse voltage that a diode can withstand is referred as __________.
(A) Peak inverse voltage (B) Barrier voltage
(C) Threshold voltage (D) Knee voltage
Ans: A
82. The full load copper loss of a transformer is 400 W. The Copper loss at half load will be __________.
(A) 100 W (B) 100 kW (C) 200 W (D) 800 W
Ans: A
83. In a wiring two lamps should be switched ‘ON’ at a time, the wiring is known as __________.
(A) Corridor wiring (B) Godown wiring (C) Hostel wiring (D) Tunnel wiring
Ans: D
84. ELCB’s are specially used to disconnect the supply under __________ conditions.
(A) Open circuit (B) Over load (C) Short circuit (D) None of these
Ans: D
85. The maximum safe temperature of class B insulation material is __________.
(A) 1308C (B) 1058C (C) 908C (D) 1208C
Ans: A
86. The controlling torque in an indicating instrument is __________.
(A) Decreases with the deflection of moving system
(B) Opposes the deflection torque
(C) Proportional to supply voltage
(D) None of these
Ans: B
87. Form Factor is defined as ratio :
(A) Average Value /RMS Value
(B) RMS Value/ Average Value
(C) RMS Value/Maximum Value
(D) Maximum Value/RMS Value
Ans: B
88. The damping torque provided by PMMC Instruments is __________.
(A) Air friction damping (B) Fluid friction damping (C) Eddy current damping (D) None of these
Ans: C
89. When the motor is stationary, the frequency of rotor current in an Induction motor is __________.
(A) Same as the supply frequency (B) Depends upon slip (C) Depends upon synchronous speed (D) None of these
Ans: A
90. Kirchoff’s voltage law is concerned with __________.
(A) IR drops (B) Battery emf’s (C) Junction voltages (D) Both (A) and (B)
Ans: D
91. A charge of 100 coulomb is transferred in a circuit by a current of 1A. Time taken by this current is __________ seconds.
(A) 1 (B) 10 (C) 100 (D) 1000
Ans: C
92. The voltage induced in the armature of a dc generator is __________.
(A) Pulsating dc (B) DC (C) Rectified ac (D) AC
Ans: D
93. The connection of a Zener diode in a circuit is always __________.
(A) Forward biased (B) In series (C) Reverse biased (D) Positively biased
Ans: C
94. The positive plate of lead acid cell is __________.
(A) Lead peroxide (B) Sponge lead (C) Lead sulphate (D) Pottasium hydroxide
Ans: A
95. The starting winding of a resistance start induction motor have __________.
(A) Low resistance and higher reactance (B) High resistance and low reactance
(C) Low resistance and low reactance (D) High resistance and high reactance
Ans: B
96. In a lap winding, the number of brushes required is equal to __________.
(A) Number of poles (B) No of pair of poles
(C) Pole pitch (D) 2
Ans: A
97. The open circuit test on a transformer is always made on __________.
(A) High voltage winding (B) Low voltage winding
(C) Either (A) or (B) (D) None of these
Ans: B
98. In a parallel circuit, all components must __________.
(A) have same potential difference across them
(B) have the same value
(C) carry the same current
(D) none of these
Ans: A
99. For a given dc generator the generator voltage depends on __________.
(A) Flux only (B) Speed only
(C) Both Flux and Speed (D) None of these
Ans: C
100. The test is conducted to check whether switches are connected in phase/live cables or not is __________.
(A) Continuity test (B) Ground test
(C) Open circuit test (D) Polarity test
Ans: D
- UPSC Exam Syllabus- Electrical Engineering
- Electrical Engineering
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