QUESTION BANK FOR JOB LINKED TEST

DISCIPLINE : ELECTRICAL

1. Current is the term used to denote

a) Sensation of electricity
b) Rate at which electron flow.
c) None of the above

2. Resistance of a conductor is
a) Dependent upon temperature
b) Temperature does not effect
c) Conductor does not offer any resistance
d) None of the above

3. Energy lost in a resistor is

a) I2R
b) IR
c) I2R
d) None of the above

4. Cable conductors are normally:

a) Stranded copper
b) Stranded aluminum
c) Both a) & b)
d) None of the above.

5. Transformers are generally used for

a) Stepping down the voltage
b) Stepping up the voltage
c) Both a) & b)
d) None of the above

6. Transformers generally have efficiency of the order of

a) Above 90%
b) 80-85%
c) 70-75%
d) 50-60%

7. A fluorescent tube is a
a) High pressure discharge lamp
b) Low pressure discharge lamp
c) None of the above
Q8. Fluorescent tubes are generally
a) 60 watts
b) 100 watts
c) 40/38 watts
d) None of the above

9. Flood lighting is mainly used for:

a) Indoor illuminations
b) Outdoor illuminations
c) Illumination of conference hall
d) None of the above.

10. Most commonly used storage batteries in automobiles are

a) Lead acid batteries
b) Ni-cd batteries
c) Dry batteries
d) None of the above

11. Energy meters are used for

a) Recording current
b) Recording voltage
c) Recording power consumed
d) Recording heating load

12. The lowest level of insulation is

a) A class
b) H class
c) Y class
d) B class
13. Renewable source of power is
a) Solar energy
b) Geo thermal energy
c) Wind energy
d) All of the above
14. Diode is used to:
a) Convert d.c. into a.c.
b) Convert a.c. into d.c
c) Ignite a lamp
d) Start a fluorescent temp

15. Which of the following is having lowest efficiency

a) Fluorescent lamp
b) Incandescent lamp
c) High pressure mercury vapour lamp.
d) High pressure sodium vapour lamp.
16. Which of the following is true
 a) A.C./D.C. rigs are most efficient
b) Mechanical rigs are most efficient
c) D.C/D.C. rigs are most efficient
d) All of the above

17. In a storage battery following things are important

a) Electrolyte level is to be maintained
b) Battery should be kept dry
c) Corrosion at the terminals should be avoided
d) All of the above.

18. We should try to maintain power factor near to:

a) 0.5
b) 0.8
c) 0.7
d) 1.0

19. Poor power factor is mainly due to

a) Inductance
b) Resistance
c) Capacitance
d) All of the above

20 Most commonly used electrical motors are

a) Squirrel cage Induction motor
b) Slip ring Induction motor
c) DC motors
d) None of the above

21. Shafts diameter is usually checked with

a) vernier calliper
b) scale
c) protector
d) caliper gange

22. If Tan ∅ =12/5 how much is Sin ∅

a) 5/12
b) 5/13
c) 13/12
d) 12/13

23. Differential relay is used in

(a) Transformer
(b) Generator
(c) both the above

24. One inch is equivalent to

 a) 25.4 millimeters
b) 0.0254 met
c) 2.54 centimeter
d) All of above

25. What are the recognized classes of insulating material.

a) Class C
b) Class F
c) Class E
d) All of the above

26. Class C type of insulation is the best an sustain temperature.

a) Above 1800 C
b) Upto 1800 C
c) Above 5000C
d) None of the above

27. Which type of signal firing is used in SCR of rigs: DC signal firing or AC
signal firing.
a) DC signal firing
b) Ac signal firing
c) Both a) & b)
d) None of the above

28. It not desirable to run induction motors at no load or light load, as its power
factor will be low in such case.
a) True
b) False

29. As per Indian Electricity rules, what is the maximum permissible leakage
current?
a) 1/5000th of maximum current carrying capacity of the circuit.
b) 1/2000th of maximum current carrying capacity of the circuit.
c) 1/3000th of maximum current carrying capacity of the circuit.
d) 1/4000th of maximum current carrying capacity of the circuit.

30. A brush less alternator is not generating voltage. What may be the cause?
a) Defective rotating rectifier assembly
c) Defective AVR
d) Burnt winding (stator/rotor/exciter)
e) All of the above

31. What is no load power factor of a 3 phase induction Motor?

a) Around 0.2
b) Around 0.3
c) Around 0.7
d) Around 0.6
32. Why are transformer cores laminated?
a) To reduce eddy current losses i.e. to improve efficiency.
b) To increase eddy current loses.
c) To reduce induction
d) None of the above

33. What are the functions of oil in oil filled transformers?

a) Cooling
b) Insulation.
c) Both a) & b)
d) None of the above

34. How the direction of separately excited DC motors is reversed?

a) By reversing the fields supply and armature supply (i.e. main supply)
b) By reversing the armature supply.
c) Both a) & b)
d) None of the above

35. What are the functions of AC module ?

a) Controls excitation of Generator (i.e. voltage & KVA
b) Governor control (i.e. kw & speed control)
c) Protection circuits for engine and generator.
d) All of the above.

36. What are the conditions to be fulfilled before running two alternators in
parallel.
a) Equal voltage
b) Equal frequency
c) Same phase sequence.
d) All of the above.

37. On what factors does the frequency of an alternator depends.

a) Speed
b) No. of poles
c) Both a) & b)
d) None of the above.

38. How much voltage does star-Delta starter give to motor at start..
a) 58% of supply voltage.
b) 85% of supply voltage
c) 45% of supply voltage
d) 33% of supply voltage

39. The slip ring induction motors are used for

a) Lift
b) Crane
c) Rolling miller.
 d) All of the above
40.. What will be the resistance of a circuit with V=250 volts and I=5 amps?
a) 20 ohms
b) 50 ohms
c) 1250 ohms
d) none of the above.

41. Possible causes of ICE formation on Expansion Valve ?

a) High discharge pressure
b) Low oil pressure
c) Chocking of condenser tubes
d) Low gas in the compressor unit.
42. Crank case heater is used
a) For circulation of compressor oil
b) To reduce the suction pressure
c) To warm-up the compressor oil
d) None of the above.

43. When air is heated following is observed

a) Decrease in Humidity
b) Increase in humidity
c) Increase in the flow of the air
d) None of these
44. Shaft Seal is used in the compressor:
a) To check the leakage of water
b) To stop the leakage of oil & gas
c) To reduce the friction of crank shaft.
d) None of the above.

45. Drop in the pressure of water in the chilled water line is due to
a) No water in the make-up tank.
b) Refrigeration cycle is not proper.
c) Cooling tower fan not working
d) Chilled water pump is rotating in reverse direction

46. Siling cycro meter is used for

a) To measure the velocity of air
b) To measure the humidity
c) To measure the temperature.
d) Both b) & c)

47. Air-conditioning controls the following factors:

a) Humidity, Temperature, air-conditioning & Air Purification
b) Humidity & air-circulation
c) Temperature & Humidity
d) Air circulation & Air purification.
48. Expansion valve controls the following:
a) Suction pressure
b) Discharge pressure
c) Controls the rate of flow of gas
d) None of the above

49. Leakage of the Ammonia Gas can be tested by :

a) Bubbles of liquid soap
b) Hylide torch
c) So2
d) Leak detector.

50. Mechanical Shaft seal is essential for :

a) Semi Hermetical compressor.
b) Hermetical rotary compressor
c) Hermetical reciprocating compressor
d) Open type compressor.

51. Which one is not used in determining the compressor displacement ?

a) Length of Piston
b) Dia of piston
c) No of cylinders
d) Length of stroke

52. Which refrigerant is used in the absorption refrigeration ?

a) Freon.
b) Sulphor-Di-oxide
c) Ammonia
d) Carbon-di-oxide

53. Why modulating motor is used in f.c.u.?

a) To control refrigerant flow
b) To control oil flow
c) To control chilled water flow
d) Both a) & b)

54. What is effect of Humidity in refrigeration system.

a) Increase in head pressure.
b) Ice formation on expansion valve.
c) Increase in suction pressure.
d) Increase in Cooling capacity

55. How the capacity of Reciprocating compressor is controlled.

a) By throttling damper in the suction line.
b) Variable speed drive.
c) Variable inlet guide-vain
 d) None of the above
56. How much is the heat required to increase 5 pound of water to 20 F.
a) 25 BTU
b) 05 BTU
c) 10 BTU
d) None of the above.

57. Oil separator is used

a) In the suction line.
b) In the liquid line.
c) In the discharge line.
d) None of the above.

58. What will happen if the condenser tubes are sealed ?

a) Temperature of the compressor will decrease
b) No effect on temperature.
c) Temperature of the compressor will increase
d) None of the above.

59. A diode as a rectifier converts.

a) AC into DC.
b) DC into AC
c) High voltage into low voltage.
d) Low voltage into high voltage.

60.Specific gravity of electrolyte is measured by

a) Voltmeter
b) Hydrometer
c) Ammeter
d) Electrometer

61. The internal resistance of the battery is said to be good

a) If it is low.
b) If it is high
c) Insulation between poles is very low
d) None of the above

62. One kilo Watt is equivalent to

a) More than one HP.
b) Less than one HP.
c) Equal to one KVA
d) None of the above.

63. New installation should have the minimum insulation resistance of

a) 100 OHMS
b) 50,000 OHMS
c) One mega OHMS
d) 10 Mega OHMS
64. Choke in the electrical tubelights is for
a) Limiting the voltage
b) Limiting the current.
c) Reduced the current of circuit.
d) None of the above.

65. What precaution should be taken while selecting cables?

a) Working voltage.
b) Type of insulation
c) Cross section of conductor
d) All of the above

66. Moving iron ammeter can be used for measurement of

a) Direct current
b) Alternating current.
c) Both DC and AC
d) None of the above

67. Power factor is equal to

a) KW/KVA
b) KVA/KW
c) KVA x KW
d) None of the above

68. The range of the voltmeter can be increased by

a) Adding high resistance in series.
b) Adding high resistance in parallel.
c) Adding low resistance is series
d) Adding low resistance in parallel.

69. In an alternator, usually

a) Armature rotates
b) Field rotates
c) Both rotates
d) None of the above.

70.An inverter converts.

a) AC into DC
b) Dc into AC
c) High voltage into low voltage
d) Low voltage into high voltage

71. Four cells of 1.5 volt are connected in series. Total voltage will be
a) 3 Volt.
b) 4 Volt
c) 5 Volt
 d) 6 Volt
72. Current transformer is used for
a) Measuring high alternating voltage.
b) High alternating current
c) High resistance
d) None of the above.

73. What is a Megger used for

a) Polarity test.
b) Short circuit test
c) Open circuit test
d) Insulation test

74. What is the function of Buchholz relay in transformer ?

a) For circulation the oil in transformer
b) For maintaining the temp. of the oil.
c) Detecting the internal fault of the transformer
d) None of the above.

75. Insulation value of oil of transformer (11 KV) should be

a) Less than 20 KV
b) More than 30 KV
c) Equal to 10 KV
d) None of the above

76. Power factor depends upon

a) Inductive load
b) Resistive load
c) Capacitive load
d) All of the above.

77. DC transmission is beneficial than the AC Transmission because of

a) Low cost of conductor
b) High cost of conductor
c) Low losses.
d) Most suitable to use

78. The possible cause of a motor not starting could be

a) Open circuit of any of the phases
b) Burn out of the fuses
c) Non-availability of the supply
d) All of the above.

79. The heating wire used in the heater is of

a) Silver
b) Copper
c) Nichrome
 d) Aluminium
80. Transformer works on the principle of
a) Mutual induction
b) Faraday’s law
c) Ohm’s law
d) Coulomb’s law

81. The efficiency of transformer is

a) More than 90%
b) 50%
c) 100%
d) none of the above

82. Speed of the motor is measured by

a) Hydrometer
b) Megger
c) Lactometer
d) Tachometer

83. What is the relation between line current and phase current in star connection.
a) IL= I Ph
b) IL= 3 I Ph
c) IL= I Ph
d) None of the above

84. If the thickness of the wire is halved. Its resistance will be

a) Half
b) Double
c) Four times
d) Zero

85. Which of the lamp has more resistance?

a) 25 Watt
b) 40 Watt
c) 60 Watt
d) 100 Watt

86. Power factor can be improved in a plant

a) By connecting capacitive load
b) By connecting inductive load
c) By connecting resistive load
d) None of the above

87. The heat produced by current passing through a conductor is proportional to

a) I
b) I2R
c) I2
 d) V/I
88. What will be the resistance of a circuit with V=250 volts and I=5 amps?
e) 20 ohms
f) 50 ohms
g) 1250 ohms
h) none of the above.

89. 1 feet =304.8 MM

a) True
b) False

90. Purpose of relay is

(a) To sense the fault
(b) To break the circuit
(c) Both the above

91. W hat is the unit of light energy

(a) kwh
(b) erg
(c) lux
(d) lumens

92. W hat should be illumination level for office room.

a) 1000lx
b) 300-400lx
c) 50-100 lx
d) 5000lx

93. W hat should be illumination level for a storage yard .

a) 1000lx
b) 300-400lx
c) 50-100 lx
d) 5000lx

94. Lux is a unit of luminous intensity

a) True
b) false

95. HPSV lamp is more efficient than HPMV lamp.

a) True
b) False
96 Which of the following lamps have longest life in burning hours.
(a) HPMV
(b) HPSV
(c) HALOGEN
(d) GLS

97. Which of the following lamps have highest energy efficiency.

(a) HPMV
(b) HPSV
(c) HALOGEN
(d) GLS

98. Which of the following lamps have lowest energy efficiency.

(a) HPMV
(b) HPSV
(c) HALOGEN
(d) GLS

99.. Which of the following lamps has best color rendering properties.
(a) HPSV
(b) LPSV
(c) METAL HALIDE

100. . HPSV lamp is more efficient than METAL HALIDE LAMP lamp.
a) True
b) False

101 Compact flourscent lamp is more efficient than GLS lamp.

a) True
b) False
102. Advantage of electronic choke is
(a) Works on lower voltage
(b) Works without starter
(c) Consumes less power
(d) All the above

103. For best utilization of existing light fittings in a room, walls should not be of
dark colour
a. True
b. False