SSC JE Electrical / Mock Test Series : 3

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

2. The power factor of an ordinary electric bulb is

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

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

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

6. A magnetic field like this is called –

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

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

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

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

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

12. In any AC circuit always –

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

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

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

16. 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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

34. The power factor of practical inductor is

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

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

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

38. The capacitor doesn’t allow sudden changes in

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

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

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

42. Unit of impedance is

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

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

45. Transformer is a

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

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

48. 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?

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

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

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

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

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

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

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

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

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

58. Frequency of Direct Current is

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

60. Active circuit have -

61. The expression for energy of an inductor

62. Form factor of half wave rectified ac is-

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

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

65. A phasor represents

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

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

68. The Inductor doesn’t allow sudden changes in

69. A choke coil is a coil having-

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

71. 1 coulomb charge equals the charge of –

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

73. Capacitors for power factor correction are rated in -

74. Battery is a

75. The frequency of an alternating current is –

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

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

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

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

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

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

82. Magnetic lines of forces –

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

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

85. Transformer core are laminated in order to reduce –

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

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

88. Absolute permittivity of dielectric medium is represented as –

89. Reactive power is the product of

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

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

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

93. Form factor of square wave is-

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

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

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

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

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

99. 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?

100. A parallel AC circuit in resonance will –