SSC JE Electrical / Mock Test Series : 3

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

2. A magnetic field like this is called –

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

4. Reactive power is the product of

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

6. Magnetic lines of forces –

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

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

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

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

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

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

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

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

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

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

17. The Inductor doesn’t allow sudden changes in

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

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

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

21. 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.

22. A parallel AC circuit in resonance will –

23. A choke coil is a coil having-

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

25. Capacitors for power factor correction are rated in -

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

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

28. Unit of impedance is

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

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

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

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

33. Absolute permittivity of dielectric medium is represented as –

34. The capacitor doesn’t allow sudden changes in

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

36. The expression for energy of an inductor

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

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

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

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

41. Active circuit have -

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

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

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

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

46. In any AC circuit always –

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

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

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

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

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

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

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

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

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

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

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

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

60. The frequency of an alternating current is –

61. Transformer is a

62. Form factor of square wave is-

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

64. 1 coulomb charge equals the charge of –

65. Transformer core are laminated in order to reduce –

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

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

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

69. Frequency of Direct Current is

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

71. Battery is a

72. The power factor of an ordinary electric bulb is

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

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

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

76. A phasor represents

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

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

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

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

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

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

83. 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?

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

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

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

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

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

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

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

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

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

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

94. Form factor of half wave rectified ac is-

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

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

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

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

99. The power factor of practical inductor is

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