KPSC – Electrician/Skilled Assistant/ Technician Exam on 30/09/2020 – Questions with Answers

1. Power factor of purely resistive circuit is…?

Unity

2. The capacitive reactance is measured in ….?

Ohm

3. Permalloy is an alloy containing…?

Nickel and iron

4. For sinusoidal current crest factor is…?

1.414

5. The specific gravity of electrolyte in a fully charged lead acid battery is…..?

1.285

6. The unit of permeability?

No unit

7. Relative permeability of vaccum is….?

unity

8. The ohm meter reading for shorted capacitor is….?

zero

9. The equivalent of one pico farad is….?

1/10 ^12

10. A parallel circuit is used as divider for…?

current

11. The unit of reluctance?

Ampere turns / Weber

12. A material that is slightly repelled by a magnet is called…?

Diamagnetic

13. The phases angle between voltage and current in a pure inductive circuit is…?

90

14. Two capacitors 5 micro farad each are connected in parallel their total effective capacitance is….?

10 micro farad

15. Aluminium become super conductor at…?

-272.15 C

16. Electrochemical equivalent of aluminium is…?

0.0936

17. Three capacitors each of 100 micro farad are connected in series across 100 V supply their equivalent capacitance is…?

300 micro farad

18. Which colour wire is recommended for earth connection as per ISI code?

Green

19. The maximum value of a sine wave AC voltage is 10 V, it rms value is…?

7.070

20. The direction of flow of lines of force around a bar magnet is….?

Out of the north pole into the south pole

21. The fusing factor of HRC fuse will be…?

1.1

22. Resistanc of 230 V 100 W incandescent lamp is…?

529 ohm

23. Temperature coefficient of resistance is measured in….?

Ohm / oC

24. Example of para magnetic material is…?

Air

25. Working voltage of megger for testing domestic installations are…?

500 V

26. The composition of tin and lead used in electrician solder is…?

60% and 40%

27. The material used as negative electrode in lithium cell is …?

Carbon

28. The reciprocal of frequency is known as…?

Time period

29. The number of electrons in an aluminium atom is….?

13

30. The capacity of a lead acid battery is expressed in…?

Ampere hour

31. The electrical instrument used to measure current is…?

Ammeter

32. The maximum number of lighting points that can be connected in a circuit is….?

10

33. One B.O.T unit is equal to….?

1000 wh

34. The minimum distance between to plates in plate earthing which are parallel should be…?

12 m

35. AC Single phase energy meter record the energy in the unit of….?

Kilo watt hour

36. Energy stored in an inductance is given by….?

1/2 LI2

37. The expansion of XLPE cable is…?

Cross linked polyethylene cable

38. Nmae the non metal will conduct electricity?

Graphite

39. A depolarizer in a dry cell is…?

Manganese dioxide

40. The material has a negative temperature coefficient of resistance is…?

Carbon

41. Removing the load from a DC series motor while working, what will happen to its speed?

Will increase

42. The width of trench for laying a single cable should be a minimum of …. cm?

35 cm

43. The fractional slip of an IM can be found by formula…?

S = Ns-Nr / Ns

44. The sun makes energy in its inner cor by a process called…?

Nuclear fusion

45. In SI System what will be the unit of Torque of DC motor?

Newton – meter

46. The starter used for slip ring IM is…?

Rotor resistance starter

47. In bio gas mixture …. is the main constituent?

Methane

48. Regenerative or Hopkinson’s test may be conducted on DC machine on…. load?

Full load

49. Which is the Dc distribution system is simplest and lowest in the first cost?

Radial system

50. Which of the following speed is called the actual speed in a three phase IM?

Rotor speed

51. The no volt coil is used as a protective device in a motor starter. What is its main function?

Open supply circuit upon failure or reduction of voltage and keep open until manually closed

52. Non conductor of an over head line, including service lines erected across a street shall at any part there of, be at a height less than ……. meters for high voltage lines?

5.486

53. In the manual star delta starter, the stop button connection is in series with the….?

Over load relay contacts

54. Equipment used for pulverizing the coal is known as…?

Stoker

55. ……is the formula for dynamically induced EMF?

BLV SinQ volts

56. What is the purpose to conduct blocked rotor test in a three phase IM?

To determine the full load copper loss

57. A solar module is made up of large number of….?

Solar cells

58. Which liquid do you use for cleaning the commutator of a DC generator?

Petrol mixed with oil

59. The depth of laying under ground cable from the ground surface for 11 KV HT cable is…?

1.1 m

60. If two phases of the supply are interchanged, what will happen ta a three phase IM?

The motor rotates in reverse direction

61. From the following power plants which one has the least operating cost?

Solar

62. In DC shunt motor what is the relation betweeen speed, flux and back emf?

N Propotional to Eb/$

63. The maximum permissible voltage drop in a 240 V network is 30%. What is the minimum acceptable voltage in any point of the network?

227V

64. Which one of the following three phase motor is not self starting?

Synchronous motor

65. The fuel used in nuclear generation power plant is…?

Isotopes of uranium

66. What is the purpose of bedding in an under groungd cable?

To protect the metallic sheath from mechanical injury from armouring

67. Calcualte the synchronous speed of 5 HP , 8 Pole/415 V 50 Hz, three phase squirrel cage IM?

750 rpm

68. In a steam power plant…..is used to heat the feed water from the flue gas.

Economizer

69. While conducting a no load test in a series motor, what consequences will occur?

The motor will reach such a high speed that the centrifugal force may destroy the motor winding.

70. Epoxy cable joint is used..?

Where heating of the cable is not permitted

71. Which one of the following is not a non conventional source of energy?

Nuclear energy

72. During rheostat breaking of DC series motors…?

Motor is run at reduced speed

73. ACSR conductors could be joined by using?

Compressive sleeves

74. How is the slip ring IM connected to the main…?

Supply to stator winding, rotor winding shorted through resistance

75. Which one is used to generate power in geothermal station?

Heat inside the earth

76. The depth of pole below the ground level on a normal soil should be…?

1/6 th of the height of the pole

77. When the three phase squirrel cage IM is started by star delta starter the starting current is reduced to….?

1/3 times

78. Which one of the following is the conventional source of energy?

Coal

79. The terminal markings of a separately excited DC generator as per indian standard is…?

A1, A2, F1,F2

80. ……..is the factor which least affects the sag of a transmission line?

Current through the conductor

81. What is the typical efficiency range of a transformer?

92 to 99 %

82. What is the relationship between the primary and secondary currents of a transformer?

no answer

83. Which condition is correct for parallel operation of transformer?

The same voltage ratio, Input voltage must be same, Same percentage impedence- all the above

84. Which method of cooling is generally adopted for low capacity distribution transformer upto 100 KVA?

Natural air method

85. Which material is used to make the discharge tube of MA type HPMV lamp?

Quartz method

86. Which type of motor used in food mixer?

Universal motor

87. What is the method to increase the conductivity in a semi conductor?

Doping

88. Which type of semi conductor the free electrons are majority?

N type

89. Which force is required to move the pointer from zero position in an indicating instrument?

Deflecting force

90. Which source of measuring error is caused by the efffect of magnetic fields?

Device error

91. What is the main application of SCR?

Speed control of motors

92. Which doping material is used to make P type semi conductor?

Boron

93. Which type instrument is used with air friction damping?

Moving iron instrument

94. Why damping force is required in a moving coil instrument ?

Arrests the needle to its zero position

95. What is the secondary induced emf in a transformer?

Es = 4.44 x f x Ns x $m

96. What is the working principle of auto transformer?

Self induction

97. What is the unit of luminous intensity?

Candela

98. What is the operating temperature of tungsten filament lamp?

2700 C

99. What is the purpose of sole plate in electric kettle?

Protect the kettle base from damage

100. Which one is a semi conductor material?

Silicon