SSC JE Electrical / Mock Test Series : 3

1. Reactive power is the product of

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

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

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

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

6. 1 coulomb charge equals the charge of –

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

8. Absolute permittivity of dielectric medium is represented as –

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

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

11. 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?

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

13. 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?

14. The power factor of practical inductor is

15. Capacitors for power factor correction are rated in -

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

17. The Inductor doesn’t allow sudden changes in

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

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

20. Transformer is a

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

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

23. Form factor of half wave rectified ac is-

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

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

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

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

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

29. The expression for energy of an inductor

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

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

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

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

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

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

36. A phasor represents

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

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

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

40. A parallel AC circuit in resonance will –

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

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

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

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

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

46. Active circuit have -

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

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

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

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

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

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

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

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

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

56. 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.

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

58. Transformer core are laminated in order to reduce –

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

60. A choke coil is a coil having-

61. The power factor of an ordinary electric bulb is

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

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

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

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

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

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

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

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

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

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

72. The frequency of an alternating current is –

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

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

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

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

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

78. A magnetic field like this is called –

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

80. Unit of impedance is

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

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

83. Battery is a

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

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

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

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

88. Magnetic lines of forces –

89. The capacitor doesn’t allow sudden changes in

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

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

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

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

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

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

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

97. Form factor of square wave is-

98. In any AC circuit always –

99. Frequency of Direct Current is

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