SSC JE Electrical / Mock Test Series : 3

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

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

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

4. In any AC circuit always –

5. 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.

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

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

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

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

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

11. Battery is a

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

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

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

15. The power factor of an ordinary electric bulb is

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

17. The expression for energy of an inductor

18. Active circuit have -

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

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

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

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

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

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

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

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

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

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

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

30. A phasor represents

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

32. A parallel AC circuit in resonance will –

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

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

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

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

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

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

39. Capacitors for power factor correction are rated in -

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

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

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

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

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

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

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

47. Transformer is a

48. Reactive power is the product of

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

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

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

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

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

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

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

56. The capacitor doesn’t allow sudden changes in

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

58. 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?

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

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

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

62. The Inductor doesn’t allow sudden changes in

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

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

65. 1 coulomb charge equals the charge of –

66. Transformer core are laminated in order to reduce –

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

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

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

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

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

72. Frequency of Direct Current is

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

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

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

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

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

78. The frequency of an alternating current is –

79. A choke coil is a coil having-

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

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

82. Form factor of square wave is-

83. A magnetic field like this is called –

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

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

86. Form factor of half wave rectified ac is-

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

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

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

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

91. Unit of impedance is

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

93. 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?

94. Magnetic lines of forces –

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

96. The power factor of practical inductor is

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

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

99. Absolute permittivity of dielectric medium is represented as –

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