ELECTRICAL ENGINEERING- PAGE 5
ELECTRICAL ENGINEERING MCQs- PAGE 5
1. Three resistances of 4Ω each are connected in parallel the equivalent resistance will be __________Ω.
(A) 4/ 3
(B) 3/ 4
(C) 1 /4
(D) 1/6
Ans: A
2. The compensating windings are connected in __________ of dc generator.
(A) series with field winding (B) parallel with field winding
(C) series with armature winding (D) parallel with armature winding
Ans: C
3. One Farad = __________.
(A) one coulomb/sec (B) one joule/coulomb
(C) one joule/sec (D) one coulomb/volt
Ans: D
4. The direction of force produced on a current carrying conductor placed in a magnetic field can be determined by __________.
(A) Fleming’s left hand rule (B) Fleming’s right hand rule
(C) Lenz’s law (D) Cork screw rule
Ans: D
5. Which one of the following material is an acceptor impurity ?
(A) Antimony (B) Silicon (C) Boron (D) Germanium
Ans: C
6. A Full wave bridge rectifier uses __________ diodes.
(A) 1 (B) 2 (C) 3 (D) 4
Ans: D
7. Hysterisis loss is proportional to __________.
(A) square of the frequency (B) frequency
(C) square of the thickness (D) thickness
Ans: B
8. The critical field resistance of a shunt generator should be __________.
(A) Greater than its shunt field resistance
(B) Smaller than its shunt field resistance
(C) Equal to the shunt field resistance
(D) None of these
Ans: A
9. The knee voltage/cut in voltage of a silicon diode is __________.
(A) 0.2 V (B) 0.3 V (C) 0.5 V (D) 0.7 V
Ans: D
10. The reciprocal of impedance is __________.
(A) Susceptance (B) Conductance (C) Admittance (D) Resistance
Ans: C
11. The instrument used for measuring current in a current carrying conductor without interrupting the circuit is __________.
(A) MI ammeter (B) Clamp on ammeter
(C) Current transformer (D) Potential transformer
Ans: B
12. The application of inductor/ballast in fluorescent lamp circuit is to __________.
(A) Increase the current at the time of starting
(B) limit the current through the lamp
(C) Reduce the induced emf
(D) None of these
Ans: B
13. Which one of the following material must have negative temperature coefficient of resistance ?
(A) Copper (B) Brass (C) Mica (D) Manganin
Ans: C
14. Buchholz relay is used on __________ transformer.
(A) Shell type (B) Welding (C) Oil cooled (D) Air cooled
Ans: C
15. The bending of electrodes due to over charging and discharging in a cell is known as __________.
(A) Hard Sulphation (B) Buckling
(C) Para short (D) None of these
Ans: B
16. The heavily dopped region of a bipolar junction transistor is __________.
(A) Emitter (B) Base (C) Collector (D) None of these
Ans: A
17. The direction of rotation of an Induction motor can be changed by changing __________.
(A) The supply frequency (B) The supply Voltage
(C) The speed (D) The phase sequence
Ans: D
18. The fuse element used in HRC fuse is __________.
(A) Copper (B) Tungsten (C) Aluminium (D) Silver
Ans: D
19. The switch is commonly used to control a lamp from three places is __________.
(A) One way switch (B) Two way switch
(C) Rotary switch (D) Intermediate switch
Ans: D
20. The load on each power sub circuit should normally be restricted to __________.
(A) 800 W (B) 3000 kW (C) 3000 W (D) 800 kW
Ans: C
(A) 4/ 3
(B) 3/ 4
(C) 1 /4
(D) 1/6
Ans: A
2. The compensating windings are connected in __________ of dc generator.
(A) series with field winding (B) parallel with field winding
(C) series with armature winding (D) parallel with armature winding
Ans: C
3. One Farad = __________.
(A) one coulomb/sec (B) one joule/coulomb
(C) one joule/sec (D) one coulomb/volt
Ans: D
4. The direction of force produced on a current carrying conductor placed in a magnetic field can be determined by __________.
(A) Fleming’s left hand rule (B) Fleming’s right hand rule
(C) Lenz’s law (D) Cork screw rule
Ans: D
5. Which one of the following material is an acceptor impurity ?
(A) Antimony (B) Silicon (C) Boron (D) Germanium
Ans: C
6. A Full wave bridge rectifier uses __________ diodes.
(A) 1 (B) 2 (C) 3 (D) 4
Ans: D
7. Hysterisis loss is proportional to __________.
(A) square of the frequency (B) frequency
(C) square of the thickness (D) thickness
Ans: B
8. The critical field resistance of a shunt generator should be __________.
(A) Greater than its shunt field resistance
(B) Smaller than its shunt field resistance
(C) Equal to the shunt field resistance
(D) None of these
Ans: A
9. The knee voltage/cut in voltage of a silicon diode is __________.
(A) 0.2 V (B) 0.3 V (C) 0.5 V (D) 0.7 V
Ans: D
10. The reciprocal of impedance is __________.
(A) Susceptance (B) Conductance (C) Admittance (D) Resistance
Ans: C
11. The instrument used for measuring current in a current carrying conductor without interrupting the circuit is __________.
(A) MI ammeter (B) Clamp on ammeter
(C) Current transformer (D) Potential transformer
Ans: B
12. The application of inductor/ballast in fluorescent lamp circuit is to __________.
(A) Increase the current at the time of starting
(B) limit the current through the lamp
(C) Reduce the induced emf
(D) None of these
Ans: B
13. Which one of the following material must have negative temperature coefficient of resistance ?
(A) Copper (B) Brass (C) Mica (D) Manganin
Ans: C
14. Buchholz relay is used on __________ transformer.
(A) Shell type (B) Welding (C) Oil cooled (D) Air cooled
Ans: C
15. The bending of electrodes due to over charging and discharging in a cell is known as __________.
(A) Hard Sulphation (B) Buckling
(C) Para short (D) None of these
Ans: B
16. The heavily dopped region of a bipolar junction transistor is __________.
(A) Emitter (B) Base (C) Collector (D) None of these
Ans: A
17. The direction of rotation of an Induction motor can be changed by changing __________.
(A) The supply frequency (B) The supply Voltage
(C) The speed (D) The phase sequence
Ans: D
18. The fuse element used in HRC fuse is __________.
(A) Copper (B) Tungsten (C) Aluminium (D) Silver
Ans: D
19. The switch is commonly used to control a lamp from three places is __________.
(A) One way switch (B) Two way switch
(C) Rotary switch (D) Intermediate switch
Ans: D
20. The load on each power sub circuit should normally be restricted to __________.
(A) 800 W (B) 3000 kW (C) 3000 W (D) 800 kW
Ans: C
21. The main purpose of using shunt across a galvanometer is to __________.
(A) Decrease its current range (B) Increase its current range
(C) Decrease its volt range (D) Increase its volt range
Ans: B
22. If two identical 220V, 8kW heating elements are connected in series across a 220 V supply, their combined rating becomes __________ kW.
(A) 2 (B) 8 (C) 16 (D) 4
Ans: C
23. The unit of the quantity of electricity is __________.
(A) Ampere Second (B) Coulomb
(C) Ampere per second (D) Both (A) and (B)
Ans: D
24. The main winding and starting winding of a single phase induction motor are connected in __________ across the supply.
(A) Series (B) Series - Parallel (C) Either (A) or (B) (D) Parallel
Ans: D
25. Damper winding in a synchronous motor __________.
(A) Reduces windage losses
(B) Serves to start the Motor
(C) Improves the power factor of the motor
(D) Increase the hunting of the motor
Ans: B
26. A switch should be placed at any height __________ above the floor level.
(A) 1.5 m (B) 1.3 m (C) 1.2 m (D) 1.6 m
Ans: A
27. For lamps with wattage above 300 W, __________ lamp holders are used.
(A) Edison screw type (B) Goliath Edison screw type
(C) Bracket (D) Bayonet cap
Ans: B
(A) Decrease its current range (B) Increase its current range
(C) Decrease its volt range (D) Increase its volt range
Ans: B
22. If two identical 220V, 8kW heating elements are connected in series across a 220 V supply, their combined rating becomes __________ kW.
(A) 2 (B) 8 (C) 16 (D) 4
Ans: C
23. The unit of the quantity of electricity is __________.
(A) Ampere Second (B) Coulomb
(C) Ampere per second (D) Both (A) and (B)
Ans: D
24. The main winding and starting winding of a single phase induction motor are connected in __________ across the supply.
(A) Series (B) Series - Parallel (C) Either (A) or (B) (D) Parallel
Ans: D
25. Damper winding in a synchronous motor __________.
(A) Reduces windage losses
(B) Serves to start the Motor
(C) Improves the power factor of the motor
(D) Increase the hunting of the motor
Ans: B
26. A switch should be placed at any height __________ above the floor level.
(A) 1.5 m (B) 1.3 m (C) 1.2 m (D) 1.6 m
Ans: A
27. For lamps with wattage above 300 W, __________ lamp holders are used.
(A) Edison screw type (B) Goliath Edison screw type
(C) Bracket (D) Bayonet cap
Ans: B
28. The composition of Electrician’s solder consists of __________.
(A) Tin 60% Lead 40% (B) Tin 40% Lead 60%
(C) Tin 90% Lead 10% (D) Tin 10% Lead 90%
Ans: A
29. The size of the fan is generally determined by its __________.
(A) length (B) thickness (C) diameter (D) sweep
Ans: D
30. An auto transformer works on the principle of __________.
(A) Statically induced emf (B) Self induced emf
(C) Mutually induced emf (D) Dynamically induced emf
Ans: B
31. At unity power factor, the effect of armature reaction is __________.
(A) Demagnetising (B) Magnetising
(C) Cross magnetising (D) None of these
Ans: C
32. A current transformer is usually a __________ transformer.
(A) step down (B) step up (C) shell type (D) isolation
Ans: B
33. When a moving iron instrument is connected in an AC circuit it indicates __________.
(A) Average value (B) Maximum Value(C) RMS value (D) None of these
Ans: C
34. The moving coil in a dynamometer type wattmeter is connected __________.
(A) In series with the fixed coil (B) Across the load
(C) In series with the load (D) Across the supply
Ans: B
35. The type of rotor is used in low and medium speed alternators are __________.
(A) smooth cylindrical type (B) non-salient pole type
(C) salient pole type (D) squirrel cage type
Ans: C
36. The number of slip rings in a rotating field system type alternator is __________.
(A) 2 (B) 3 (C) 4 (D) 6
Ans: A
(A) Tin 60% Lead 40% (B) Tin 40% Lead 60%
(C) Tin 90% Lead 10% (D) Tin 10% Lead 90%
Ans: A
29. The size of the fan is generally determined by its __________.
(A) length (B) thickness (C) diameter (D) sweep
Ans: D
30. An auto transformer works on the principle of __________.
(A) Statically induced emf (B) Self induced emf
(C) Mutually induced emf (D) Dynamically induced emf
Ans: B
31. At unity power factor, the effect of armature reaction is __________.
(A) Demagnetising (B) Magnetising
(C) Cross magnetising (D) None of these
Ans: C
32. A current transformer is usually a __________ transformer.
(A) step down (B) step up (C) shell type (D) isolation
Ans: B
33. When a moving iron instrument is connected in an AC circuit it indicates __________.
(A) Average value (B) Maximum Value(C) RMS value (D) None of these
Ans: C
34. The moving coil in a dynamometer type wattmeter is connected __________.
(A) In series with the fixed coil (B) Across the load
(C) In series with the load (D) Across the supply
Ans: B
35. The type of rotor is used in low and medium speed alternators are __________.
(A) smooth cylindrical type (B) non-salient pole type
(C) salient pole type (D) squirrel cage type
Ans: C
36. The number of slip rings in a rotating field system type alternator is __________.
(A) 2 (B) 3 (C) 4 (D) 6
Ans: A
37. The transformer connection used at the substation end of the transmission line is __________.
(A) Star - Star (B) Delta - Delta (C) Delta - Star (D) Star - Delta
Ans: D
38. Dynamometer type instruments can be used as a __________.
(A) dc circuit only (B) AC circuit only
(C) For both AC and DC circuits (D) None of these
Ans: C
39. The method of speed control of series motor used in electric trains is __________.
(A) Field tapping method (B) Field diverter method
(C) Series parallel method (D) Voltage control method
Ans: B
40. The dc generator used for arc welding process is __________.
(A) Cummulatively compound (B) Series wound
(C) Under compound (D) Differentially compound
Ans: D
41. An electric current of 10 A is divided into two branches of resistance 2 Ω and 3 Ω respectively. The branch current in 3 Ω resistance is __________ A.
(A) 4 (B) 6 (C) 3 (D) 2
Ans: A
42. A 3φ induction motor is wound for 4 poles, the synchronous speed of the motor supplied from a 50 Hz system is _________ rpm.
(A) 1440 (B) 1500 (C) 1400 (D) 1600
Ans: B
43. Armature torque produced in a dc series motor is proportional to __________.
(A) The field current (B) The armature current
(C) The square of the armature current (D) None of these
Ans: C
44. During charging of a lead acid cell, the specific gravity of the electrolyte is __________.
(A) Decreases (B) Increases (C) Doesnot change (D) None of these
Ans: B
45. The power consumption of purely capacitive circuit is __________.
(A) zero (B) unity (C) less than unity (D) greater than unity
Ans: A
46. A coil has a resistance of 6Ω and reactance of 8Ω are connected in series, its impedance is __________ Ω.
(A) 36 (B) 64 (C) 14 (D) 10
Ans: D
47. The emf of a Fully charged lead acid cell is __________ volt.
(A) 1.21 (B) 2.1 (C) 1.8 (D) 1.4
Ans: B
48. The transfer of heat from the heating element with in to material being ironed in an electric iron is done by using __________.
(A) Pressure plate (B) Sole plate (C) Heel plate (D) Thermostat
Ans: B
49. Increased capacitance can be obtained by connecting the given capacitors in __________.
(A) Series (B) Parallel (C) Series Parallel (D) None of these
Ans: B
50. Value of short circuit current will flow in the circuit is __________.
(A) Zero (B) Very low (C) Normal (D) Infinite
Ans: D
51. Motor used in household refrigerator is __________.
(A) D.C. Series motor (B) Single phase induction motor (C) D.C. Shunt motor (D) Universal motor
Ans: B
52. Which motor would you select for vaccum cleaner ?
(A) Universal motor (B) Repulsion motor (C) Hysterisis motor (D) None of these
Ans: A
53. The damper winding in a synchronous motor is generally used __________.
(A) To provide starting torque only (B) To reduce noise level (C) To reduce eddy current (D) To prevent hunting and provide the starting torque
Ans: D
54. An Auto transformer which has only one winding may be used as __________.
(A) Step-up transformer (B) Step-down transformer (C) Step-up and Step-down transformer (D) None of these
Ans: C
55. The unit of solid angle is a __________.
(A) Lumen (B) Radian (C) Steradian (D) Candela
Ans: B
56. Full form of MCCB is __________.
(A) Moulded Case Circuit Breaker (B) Moulded Case Current Breaker
(C) Miniature Current Circuit Breaker (D) Minimum Current Circuit Breaker
Ans: A
57. The star delta starter is used in __________.
(A) Flour mills (B) Pumps (C) Machine tools (D) All of these
Ans: D
58. Motor used in ceiling fan is __________.
(A) Split phase motor (B) Capacitor start motor (C) A.C. series motor (D) Repulsion motor
Ans: B
59. Rotor resistance starter used to which of the following motors ?
(A) Slip ring motor (B) Heavy duty squirrel cage motor (C) Medium duty squirrel cage motor (D) Double cage motor
Ans: A
60. The thickness of insulation provided in the conductor in cable depends upon the factor is __________.
(A) Resistivity of the conductor (B) Current to be carried (C) Operating voltage (D) Power factor
Ans: C
61. The structure of pin type insulator is wavy. It is done to increase __________.
(A) Mechanical strength (B) Puncture strength (C) Flash over voltage (D) Thermal strength
Ans: C
62. Carbon arc lamp are commonly used in __________.
(A) Cinema projectors (B) Domestic lighting (C) Street lighting (D) Photography
Ans: A
63. Which of the following is one not a part of circuit breaker ?
(A) Explosion plot (B) Conservator (C) Operating mechanism (D) Fixed and moving contact
Ans: B
64. The handle of iron box is made up of __________.
(A) Bakelite (B) Ebonite (C) Chromium (D) Bakelite and Ebonite
Ans: D
65. Lumen per watt is the unit of __________.
(A) Light flux (B) Luminous efficiency (C) Luminous intensity (D) Brightness
Ans: B
66. The generating voltage and frequency in India is __________.
(A) 11 kV and 50 Hz (B) 11 kV and 60 Hz (C) 220 kV and 50 Hz (D) 220 kV and 60 Hz
Ans: A
67. The lamp generally used for lighting purpose is __________.
(A) Carbon filament lamp (B) Arc lamp (C) Tungsten filament lamp (D) All of the above
Ans: C
68. In running condition voltage across tube starter is __________.
(A) 110 V (B) 180 V (C) 220 V (D) Zero
Ans: D
69. Capacitor is used in tube circuit is __________.
(A) To improve the power factor (B) To improve the voltage (C) To safeguard the tube (D) To give the full light
Ans: A
70. The synchronous speed of an induction motor refers to the speed of the __________.
(A) Rotor (B) Armature (C) Speed marked on the name plate (D) Rotating magnetic field
Ans: D
71. Three phase induction motor started by DOL starter, the short circuit current is protected by __________.
(A) No volt coil (B) Overload relay (C) Back off fuse (D) Protective earth connection
Ans: C
72. Cables are drawn through the pipe and terminated. The system of wiring is called __________.
(A) PVC casing and caping wire (B) Conduit wiring
(C) Teak wood batton wiring (D) Teak wood casing caping wiring
Ans: B
73. As compared to rewirable fuses HRC fuse have __________.
(A) High speed of operation (B) High rupturing capacity (C) No ageing effect (D) Low rupturing capacity
Ans: B
74. The following application D.C. is essential __________.
(A) Electric traction motor (B) Electric home appliances (C) Machine shop motor (D) Illumination
Ans: A
75. Which of the following does not change in a transformer ?
(A) Current (B) Voltage (C) Frequency (D) All of these
Ans: C
76. Which winding in a transformer has more number of turns ?
(A) Low voltage winding (B) High voltage winding (C) Winding does not depend upon number of turns (D) None of these
Ans: B
77. In a D.C. machine the number of brushes in lap winding is __________.
(A) Same number of poles (B) Double number of poles (C) Half of the number of poles (D) Two numbers
Ans: A
78. Compensating windings are used in D.C. generator is __________.
(A) To reduce eddy current by local short circuit (B) To provide path for the circulation of cooling air
(C) To neutralize the cross magnetic effect of armature reaction (D) None of these
Ans: C
79. Red colour wire is generally known for __________.
(A) Insulated wire (B) Earth wire (C) Neutral wire (D) Phase wire
Ans: D
80. Stepper motor is __________.
(A) Single phase motor (B) Two phase motor (C) Three phase motor (D) D.C. motor
Ans: D
81. The positive pole of dry cell is made of __________.
(A) Copper (B) Zinc (C) Carbon (D) Mercury
Ans: C
82. The energy of secondary cells are renewed by __________.
(A) Heating it (B) Passing current through it (C) Renewing its chemicals (D) It can’t be renewed at all
Ans: B
83. When cells are connected in parallel, the result is __________.
(A) The current capacity increases (B) The current capacity decreases
(C) The EMF capacity increases (D) The EMF capacity decreases
Ans: A
84. The composition of electrician solder is __________.
(A) Tin-40%, Lead-60% (B) Tin-50%, Lead-50% (C) Tin-90%, Lead-10% (D) Tin-60%, Lead-40%
Ans: D
85. Fire extinguisher used in the event of electric fire is __________.
(A) Dry powder type (B) Gas cartridge type (C) Halon type (D) Foam type
Ans: C
86. Britania straight joint is used for __________.
(A) Increase the length of the conductor (B) Increase the resistance of the conductor
(C) Increase the conductivity of the conductor (D) Increase the mechanical strength of the conductor
Ans: A
87. E.C.E. stands for __________.
(A) Electrovalent Chemical Equilant (B) Electro Chemical Equilant (C) Electrolysis Cathode Equilant (D) Electro Cardio Equilant
Ans: B
88. A current of ten ampere is same as __________.
(A) Ten joule per second (B) Ten watts per second (C) Ten volt per second (D) Ten coulomb per second
Ans: D
89. The power dissipated in a pure capacitor is __________.
(A) Zero (B) Unity (C) Proportional to the applied voltage (D) Proportional to the value of capacitance
Ans: A
90. Which of the following has positive temperature co-efficient ?
(A) Germanium (B) Aluminium (C) Graphite (D) Rubber
Ans: B
91. I.G.B.T. stands for __________.
(A) Integrated Gate Bidirectional Transistor (B) Integrated Gate Blocky Transistor
(C) Integrated Gate Bipolar Transistor (D) Insulated Gate Bipolar Transistor
Ans: C
92. In Fleming’s right hand rule, the fore finger indicates __________.
(A) The direction of induced EMF (B) The direction of motion of the conductor (C) The direction of induced current (D) The direction of magnetic flux
Ans: D
93. Diode is a __________.
(A) Multidirectional device (B) Unidirectional device (C) Bidirectional device (D) None of these
Ans: C
94. Earth wire or ground wire is made of __________.
(A) Copper (B) Iron (C) Aluminium (D) Galvanized steel
Ans: D
95. Which tool is used to transfer measurement to the inside caliper ?
(A) Odd leg caliper (B) Steel rule (C) Genny caliper (D) Divider
Ans: B
96. Chisel used for making rectangular holes in wood is __________.
(A) Firmer Chisel (B) Paring Chisel (C) Mortise Chisel (D) Beavel - Firmer Chisel
Ans: A
97. Name the element used as impurity to produce N-type semiconductor __________.
(A) Gallium (B) Boron (C) Aluminium (D) Arsenic
Ans: D
98. Which of the following is known as metal rectifier ?
(A) Gas tube diode (B) Silicon diode (C) Copper oxide rectifier (D) All of the above
Ans: C
99. Type of filter can be used along with a full wave rectifier only is __________.
(A) Series inductor filter (B) Pi filter (C) Resistance Capacitance filter (D) Choke input LC filter
Ans: A
100. The difference between peak positive and peak negative values in AC is called __________.
(A) Effective value (B) Peak to Peak value (C) Maximum value (D) Average value
Ans: B
(A) Zero (B) Very low (C) Normal (D) Infinite
Ans: D
51. Motor used in household refrigerator is __________.
(A) D.C. Series motor (B) Single phase induction motor (C) D.C. Shunt motor (D) Universal motor
Ans: B
52. Which motor would you select for vaccum cleaner ?
(A) Universal motor (B) Repulsion motor (C) Hysterisis motor (D) None of these
Ans: A
53. The damper winding in a synchronous motor is generally used __________.
(A) To provide starting torque only (B) To reduce noise level (C) To reduce eddy current (D) To prevent hunting and provide the starting torque
Ans: D
54. An Auto transformer which has only one winding may be used as __________.
(A) Step-up transformer (B) Step-down transformer (C) Step-up and Step-down transformer (D) None of these
Ans: C
55. The unit of solid angle is a __________.
(A) Lumen (B) Radian (C) Steradian (D) Candela
Ans: B
56. Full form of MCCB is __________.
(A) Moulded Case Circuit Breaker (B) Moulded Case Current Breaker
(C) Miniature Current Circuit Breaker (D) Minimum Current Circuit Breaker
Ans: A
57. The star delta starter is used in __________.
(A) Flour mills (B) Pumps (C) Machine tools (D) All of these
Ans: D
58. Motor used in ceiling fan is __________.
(A) Split phase motor (B) Capacitor start motor (C) A.C. series motor (D) Repulsion motor
Ans: B
59. Rotor resistance starter used to which of the following motors ?
(A) Slip ring motor (B) Heavy duty squirrel cage motor (C) Medium duty squirrel cage motor (D) Double cage motor
Ans: A
60. The thickness of insulation provided in the conductor in cable depends upon the factor is __________.
(A) Resistivity of the conductor (B) Current to be carried (C) Operating voltage (D) Power factor
Ans: C
61. The structure of pin type insulator is wavy. It is done to increase __________.
(A) Mechanical strength (B) Puncture strength (C) Flash over voltage (D) Thermal strength
Ans: C
62. Carbon arc lamp are commonly used in __________.
(A) Cinema projectors (B) Domestic lighting (C) Street lighting (D) Photography
Ans: A
63. Which of the following is one not a part of circuit breaker ?
(A) Explosion plot (B) Conservator (C) Operating mechanism (D) Fixed and moving contact
Ans: B
64. The handle of iron box is made up of __________.
(A) Bakelite (B) Ebonite (C) Chromium (D) Bakelite and Ebonite
Ans: D
65. Lumen per watt is the unit of __________.
(A) Light flux (B) Luminous efficiency (C) Luminous intensity (D) Brightness
Ans: B
66. The generating voltage and frequency in India is __________.
(A) 11 kV and 50 Hz (B) 11 kV and 60 Hz (C) 220 kV and 50 Hz (D) 220 kV and 60 Hz
Ans: A
67. The lamp generally used for lighting purpose is __________.
(A) Carbon filament lamp (B) Arc lamp (C) Tungsten filament lamp (D) All of the above
Ans: C
68. In running condition voltage across tube starter is __________.
(A) 110 V (B) 180 V (C) 220 V (D) Zero
Ans: D
69. Capacitor is used in tube circuit is __________.
(A) To improve the power factor (B) To improve the voltage (C) To safeguard the tube (D) To give the full light
Ans: A
70. The synchronous speed of an induction motor refers to the speed of the __________.
(A) Rotor (B) Armature (C) Speed marked on the name plate (D) Rotating magnetic field
Ans: D
71. Three phase induction motor started by DOL starter, the short circuit current is protected by __________.
(A) No volt coil (B) Overload relay (C) Back off fuse (D) Protective earth connection
Ans: C
72. Cables are drawn through the pipe and terminated. The system of wiring is called __________.
(A) PVC casing and caping wire (B) Conduit wiring
(C) Teak wood batton wiring (D) Teak wood casing caping wiring
Ans: B
73. As compared to rewirable fuses HRC fuse have __________.
(A) High speed of operation (B) High rupturing capacity (C) No ageing effect (D) Low rupturing capacity
Ans: B
74. The following application D.C. is essential __________.
(A) Electric traction motor (B) Electric home appliances (C) Machine shop motor (D) Illumination
Ans: A
75. Which of the following does not change in a transformer ?
(A) Current (B) Voltage (C) Frequency (D) All of these
Ans: C
76. Which winding in a transformer has more number of turns ?
(A) Low voltage winding (B) High voltage winding (C) Winding does not depend upon number of turns (D) None of these
Ans: B
77. In a D.C. machine the number of brushes in lap winding is __________.
(A) Same number of poles (B) Double number of poles (C) Half of the number of poles (D) Two numbers
Ans: A
78. Compensating windings are used in D.C. generator is __________.
(A) To reduce eddy current by local short circuit (B) To provide path for the circulation of cooling air
(C) To neutralize the cross magnetic effect of armature reaction (D) None of these
Ans: C
79. Red colour wire is generally known for __________.
(A) Insulated wire (B) Earth wire (C) Neutral wire (D) Phase wire
Ans: D
80. Stepper motor is __________.
(A) Single phase motor (B) Two phase motor (C) Three phase motor (D) D.C. motor
Ans: D
81. The positive pole of dry cell is made of __________.
(A) Copper (B) Zinc (C) Carbon (D) Mercury
Ans: C
82. The energy of secondary cells are renewed by __________.
(A) Heating it (B) Passing current through it (C) Renewing its chemicals (D) It can’t be renewed at all
Ans: B
83. When cells are connected in parallel, the result is __________.
(A) The current capacity increases (B) The current capacity decreases
(C) The EMF capacity increases (D) The EMF capacity decreases
Ans: A
84. The composition of electrician solder is __________.
(A) Tin-40%, Lead-60% (B) Tin-50%, Lead-50% (C) Tin-90%, Lead-10% (D) Tin-60%, Lead-40%
Ans: D
85. Fire extinguisher used in the event of electric fire is __________.
(A) Dry powder type (B) Gas cartridge type (C) Halon type (D) Foam type
Ans: C
86. Britania straight joint is used for __________.
(A) Increase the length of the conductor (B) Increase the resistance of the conductor
(C) Increase the conductivity of the conductor (D) Increase the mechanical strength of the conductor
Ans: A
87. E.C.E. stands for __________.
(A) Electrovalent Chemical Equilant (B) Electro Chemical Equilant (C) Electrolysis Cathode Equilant (D) Electro Cardio Equilant
Ans: B
88. A current of ten ampere is same as __________.
(A) Ten joule per second (B) Ten watts per second (C) Ten volt per second (D) Ten coulomb per second
Ans: D
89. The power dissipated in a pure capacitor is __________.
(A) Zero (B) Unity (C) Proportional to the applied voltage (D) Proportional to the value of capacitance
Ans: A
90. Which of the following has positive temperature co-efficient ?
(A) Germanium (B) Aluminium (C) Graphite (D) Rubber
Ans: B
91. I.G.B.T. stands for __________.
(A) Integrated Gate Bidirectional Transistor (B) Integrated Gate Blocky Transistor
(C) Integrated Gate Bipolar Transistor (D) Insulated Gate Bipolar Transistor
Ans: C
92. In Fleming’s right hand rule, the fore finger indicates __________.
(A) The direction of induced EMF (B) The direction of motion of the conductor (C) The direction of induced current (D) The direction of magnetic flux
Ans: D
93. Diode is a __________.
(A) Multidirectional device (B) Unidirectional device (C) Bidirectional device (D) None of these
Ans: C
94. Earth wire or ground wire is made of __________.
(A) Copper (B) Iron (C) Aluminium (D) Galvanized steel
Ans: D
95. Which tool is used to transfer measurement to the inside caliper ?
(A) Odd leg caliper (B) Steel rule (C) Genny caliper (D) Divider
Ans: B
96. Chisel used for making rectangular holes in wood is __________.
(A) Firmer Chisel (B) Paring Chisel (C) Mortise Chisel (D) Beavel - Firmer Chisel
Ans: A
97. Name the element used as impurity to produce N-type semiconductor __________.
(A) Gallium (B) Boron (C) Aluminium (D) Arsenic
Ans: D
98. Which of the following is known as metal rectifier ?
(A) Gas tube diode (B) Silicon diode (C) Copper oxide rectifier (D) All of the above
Ans: C
99. Type of filter can be used along with a full wave rectifier only is __________.
(A) Series inductor filter (B) Pi filter (C) Resistance Capacitance filter (D) Choke input LC filter
Ans: A
100. The difference between peak positive and peak negative values in AC is called __________.
(A) Effective value (B) Peak to Peak value (C) Maximum value (D) Average value
Ans: B
- UPSC Exam Syllabus- Electrical Engineering
- Electrical Engineering
- Electrical Engineering- Page 1
- Electrical Engineering- Page 2
- Electrical Engineering- Page 3
- Electrical Engineering- Page 4
- Electrical Engineering- Page 5
- Electrical Engineering- Page 6
- Electrical Engineering- Page 7
- Electrical Engineering- Page 8
- Electrical Engineering- Page 9
- Electrical Engineering- Page- 10
- Electrical Engineering- Page- 11