SSC JE Electrical / Mock Test Series : 3

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

2. Reactive power is the product of

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

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

5. Battery is a

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

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

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

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

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

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

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

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

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

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

16. Form factor of half wave rectified ac is-

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

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

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

20. Absolute permittivity of dielectric medium is represented as –

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

22. Active circuit have -

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

24. Transformer is a

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

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

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

28. The Inductor doesn’t allow sudden changes in

29. Frequency of Direct Current is

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

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

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

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

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

35. Form factor of square wave is-

36. Magnetic lines of forces –

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

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

39. A phasor represents

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

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

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

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

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

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

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

47. 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?

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

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

50. The capacitor doesn’t allow sudden changes in

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

52. A choke coil is a coil having-

53. The power factor of practical inductor is

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

55. 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.

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

57. The power factor of an ordinary electric bulb is

58. Capacitors for power factor correction are rated in -

59. The frequency of an alternating current is –

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

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

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

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

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

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

66. 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?

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

68. Transformer core are laminated in order to reduce –

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

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

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

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

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

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

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

76. The expression for energy of an inductor

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

78. Unit of impedance is

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

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

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

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

83. In any AC circuit always –

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

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

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

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

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

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

90. A magnetic field like this is called –

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

92. 1 coulomb charge equals the charge of –

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

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

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

96. A parallel AC circuit in resonance will –

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

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

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

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