SSC JE Electrical / Mock Test Series : 3

1. The formula used to find the capacitance C is __________

2. If the inductive reactance of a coil is 6 ohm and internal resistance is 8 ohm, then the impedance will be –

3. A wire has the same resistance as the one given in the figure. Calculate its resistivity if the length of the wire is 10m and its area of cross section is 2m.

4. What is the RMS value of the current if the maximum value of sine wave current is 100 A?

5. When an alternating current passes through an Ohmic resistance the electrical power converted into heat is –

6. An electric incandescent lamp has the power factor of –

7. Frequency of Direct Current is

8. Transformer is a

9. The peak value of a sine wave is 200 V. Its average value is –

10. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

11. 1 coulomb charge equals the charge of –

12. An Inductor works as a ___________ circuit for DC supply.

13. In any AC circuit always –

14. What will be the Q-factor of a circuit, if power factor is 0.9?

15. Reactive power is the product of

16. Direction of DC motor can be found out by-

17. The capacitor doesn’t allow sudden changes in

18. For a 55KVA, 11000 Volts/440 Volts, 50Hz single phase transformer, the values of primary and secondary currents are –

19. The power factor of an ordinary electric bulb is

20. A 20 kHz pulse waveform consists of pulses that are 15 μs wide. The duty cycle is 

21. A magnetic field like this is called –

22. In series R-L circuit power factor can be defined as –

23. Active circuit have -

24. The component of current which is in quadrature with supply voltage, is –

25. Which of the following is used to determine the direction of rotation of D.C motor?

26. The units for inductance is _________ and capacitance is ___________

27. In an AC circuit (Sine wave) with R and L in series –

28. Three nos 6-ohm resistances are connected in delta. Value of resistances if connected in star – 

29. Form factor of square wave is-

30. Battery is a

31. In series R-L circuit power factor can be defined as - 

32. The form factor for a sinusoidal a.c. voltage is – 

33. From the following when capacitive reactance will be more?

34. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is –

35. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out?

36. A bulb consumes 100 W when supply voltage is 200 V. Then find the energy consumed in 30 minutes.

37. Calculate the value of energy stored in an inductor if the value of inductance is 10H and 2A of current flows through it.-

38. RMS value can be defined based on which of the following? –

39. Which of the following will not be affected due to change in R?

40. Real part and imaginary part of admittance are respectively –

41. In a R-L-C series circuit, if the inductive reactance is greater than the capacitive reactance, then the power factor will be –

42. If the voltage across a capacitor is constant, then current passing through it is ________

43. Amplitude is the maximum value of a voltage or current

44. For a sinusoidal AC voltage, peak factor or amplitude fator or crest factor is –

45. A wire of length 2m and another wire of length 5m are made up of the same material and have the same area of cross section, which wire has higher resistance?

46. An alternating voltage is given by, V = 10 sin 2πt. The frequency of the AC signal is –

47. A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?

48. In series R-L circuit power factor can be defined as –

49. Magnetic lines of forces –

50. If a capacitor of capacitance 9.2F has a voltage of 22.5V across it. Calculate the energy of the capacitor.

51. Two waves of the same frequency have opposite phase when the phase angle between them is –

52. In a R-L-C circuit, power loss takes place is – 

53. Capacitors for power factor correction are rated in -

54. A parallel AC circuit in resonance will –

55. A signal with a 400 μs period has a frequency of

56. The power factor of practical inductor is

57. An Alternating Current has a periodic time of 0.02 sec, then the frequency will be –

58. The expression for energy of an inductor

59. In a R-L-C series circuit, if the capacitive reactance is greater than the inductive reactance, then the power factor will be –

60. In a R-L-C circuit, power loss takes place is –

61. The RMS value of a sine wave is 100 A. Its peak value is –

62. In an AC circuit a low value of KVAR compared with KW indicates –

63. In series R-L circuit power factor can be defined as –

64. In a series R-C circuit, the applied voltage –

65. A 1 kHz signal has a period of 1 ms

66. A coil of many circular turns of wire wrapped in the shape of a cylinder is known as -

67. A 2 micro farad capacitor connected across 10 volt DC. Value of current is – 

68. A choke coil is a coil having-

69. For a sinusoidal AC voltage, amplitude factor is –

70. RMS value can be defined based on which of the following? –

71. In an AC circuit (Sine wave) with R and L in series –

72. The direction of rotation of a dc generator is found out by

73. In a series R-C circuit, the applied voltage –

74. The alternative name/names for active power is/are –

75. Transformer core are laminated in order to reduce –

76. Unit of impedance is

77. Which DC motor is preferred for wide range of speed regulation?

78. If a capacitor is connected with DC supply, it will act as –

79. A saw-tooth wave has a period of 10 ms. Its frequency is

80. The equation for instantaneous value of alternating current is, then time period will be –

81. The frequency of an AC voltage in India, is–

82. Absolute permittivity of dielectric medium is represented as –

83. A phasor represents

84. The Inductor doesn’t allow sudden changes in

85. Form factor of half wave rectified ac is-

86. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

87. For a pure inductive circuit, the average demand of power from the source will be –

88. The frequency of an alternating current is –

89. A sine wave has a frequency of 50 Hz. Its angular frequency is _______radian/second.

90. An alternating voltage is given by, V = 10 sin 2πt. The frequency of the AC signal is –

91. The power factor of an AC circuit lies between –

92. If the length of a wire is doubled and diameter is halved, then the resistance will become _________ of the previous.

93. The frequency of an AC voltage,e= 100 cos 314t , will be –

94. RMS value can be defined based on which of the following? –

95. For a sinusoidal AC voltage, amplitude factor is –

96. A heater is rated as 230 V, 10 kW. The value 230 V refers to –

97. For a sinusoidal AC voltage, amplitude factor is –

98. A pure capacitance connected across 50 Hz, 230 V supply consumes 0.04 W. This consumption is attributed to –

99. With the star delta starter the voltage across the motor winding at starting is – 

100. A current is set to be alternating when it changes –