SSC JE Electrical / Mock Test Series : 3

1. Capacitors for power factor correction are rated in -

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

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

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

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

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

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

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

9. Form factor of square wave is-

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

11. The Inductor doesn’t allow sudden changes in

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

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

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

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

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

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

18. The capacitor doesn’t allow sudden changes in

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

20. Reactive power is the product of

21. Magnetic lines of forces –

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

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

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

25. 1 coulomb charge equals the charge of –

26. A magnetic field like this is called –

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

28. A choke coil is a coil having-

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

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

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

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

33. The power factor of practical inductor is

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

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

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

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

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

39. Absolute permittivity of dielectric medium is represented as –

40. Transformer core are laminated in order to reduce –

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

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

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

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

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

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

47. Frequency of Direct Current is

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

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

50. Unit of impedance is

51. A phasor represents

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

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

54. Battery is a

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

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

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

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

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

60. The frequency of an alternating current is –

61. The power factor of an ordinary electric bulb is

62. Form factor of half wave rectified ac is-

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

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

65. 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?

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

67. In any AC circuit always –

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

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

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

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

72. 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.

73. Active circuit have -

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

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

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

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

78. 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?

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

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

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

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

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

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

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

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

87. The expression for energy of an inductor

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

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

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

91. A parallel AC circuit in resonance will –

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

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

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

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

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

97. Transformer is a

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

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

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