SSC JE Electrical / Mock Test Series : 1

1. The average half-cycle value of a sine wave with a 40 V peak is

2. Which is the property of a coil by which a counter E.M.F is induced when the current through the coil changes?

3. Materials which easily allow the passage of electric current are known as ______

4. Periodic is characterized by a repetition at fixed time intervals

5. S.I unit of Reluctance-

6. The unit of magnetic flux is –

7. The flow of electron in solids is due to –

8. The capacitor doesn’t allow sudden changes in

9. The current in each branch of a parallel circuit is proportional to _________

10. Paramagnetic materials are –

11. The reciprocal of permeability is –

12. Magnetic field strength is

13. Reactive power is the product of

14. Strength of the electromagnet can be increased by increasing –

15. What is the voltage measured across a series short?
a) b)  c)  d) 

16. Sparking may occurs when a load is switched off due to the presence of –

17. The insulating medium between the two plates of capacitor is known as __________

18. Transformer is a

19. The unit of frequency is the hertz

20. The voltage across the open circuit is?

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

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

23. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.

24. The power factor of an ordinary electric bulb is

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

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

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

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

29. The square waveform of current has following relation between R.M.S. value and average value –

30. Unit of magnetic flux density is in S.I.

31. The reciprocal of resistivity is________

32. Which of the following statements are true with regard to resistivity?

33. When a sine wave has a frequency of 100 Hz in 12 s it goes through

34. The resistance of straight conductor is independent of-

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

36. What happens to the current in the series circuit if the resistance is doubled?

37. Many resistors connected in series will?

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

39. Which, among the following is a unit for resistivity?

40. Magnetic lines of forces –

41. What is the resistivity of Copper?

42. To obtain a high value of capacitance, the permittivity of dielectric medium should be –

43. The principle of electromagnetic induction was propounded by

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

45. The instantaneous value is the voltage or current value of a waveform at its peak

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

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

48. Unit of resistivity is

49. Magnetic lines of forces –

50. Transformer core are laminated in order to reduce –

51. Resistance of any circuit depends on –

52. Which of the following is unit less?

53. Magnetic field has -

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

55. The energy per unit charge is

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

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

58. The most important advantage of using electrical energy in the form of a AC is –

59. The frequency of an alternating current is –

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

61. The length of a phasor represents the amplitude

62. The power factor of practical inductor is

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

64. The Inductor doesn’t allow sudden changes in

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

66. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

67. Voltage across the 60 ohm resistor is______

68. The expression for energy of an inductor

69. What is the value of x if the current in the circuit is 5 A?

70. The voltage across the short is?

71. Which of the following statements are true with regard to resistance?

72. Which is the most cost efficient connection?

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

74. Principle of dynamically induced E.M.F is used in a –

75. Magnetic field is proportional to the –

76. S.I unit of conductance is –

77. Unit of impedance is

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

79. The induced E.M.F. and current always oppose the cause of producing them is according to which law?

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

81. Statically induced E.M.F’s magnitude depends on the –

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

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

84. The total resistance between A and B are?

85. What is the power in the magnetic field if the current in a coil has a constant inductance of L henrys grows at a uniform rate?

86. The direction of rotation of a dc motor is found out by

87. Magnetic circuit is a closed path followed by –

88. S.I unit of Power is –

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

90. What is the relation between resistance R and resistivity ρ of a wire ?

91. What is the relation between resistance R and resistivity ρ of a wire ?

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

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

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

95. The energy stored by a capacitor is given by –

96. The currents in the three branches of a parallel circuit are 3 A, 4 A and 5 A. What is the current leaving it?

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

98. When a permanent magnet is cut half what will be the result?

99. Which rule do we use to predict the direction of movement of a current carrying wire in a magnetic field?

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