SSC JE Electrical / Mock Test Series : 3

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

2. Unit of impedance is

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

4. Reactive power is the product of

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

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

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

8. Absolute permittivity of dielectric medium is represented as –

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

10. A magnetic field like this is called –

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

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

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

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

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

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

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

18. Transformer is a

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

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

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

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

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

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

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

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

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

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

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

30. A choke coil is a coil having-

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

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

33. A phasor represents

34. Capacitors for power factor correction are rated in -

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

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

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

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

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

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

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

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

43. Transformer core are laminated in order to reduce –

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

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

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

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

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

49. Active circuit have -

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

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

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

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

54. The frequency of an alternating current is –

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

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

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

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

59. 1 coulomb charge equals the charge of –

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

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

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

63. The power factor of an ordinary electric bulb is

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

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

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

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

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

69. In any AC circuit always –

70. Magnetic lines of forces –

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

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

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

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

75. 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?

76. Battery is a

77. 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.

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

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

80. Frequency of Direct Current is

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

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

83. Form factor of square wave is-

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

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

86. The power factor of practical inductor is

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

88. The Inductor doesn’t allow sudden changes in

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

90. 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?

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

92. A parallel AC circuit in resonance will –

93. The capacitor doesn’t allow sudden changes in

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

95. The expression for energy of an inductor

96. Form factor of half wave rectified ac is-

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

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

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

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