SSC JE Electrical / Mock Test Series : 1

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

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

3. The unit of frequency is the hertz

4. Unit of resistivity is

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

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

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

8. The power factor of practical inductor is

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

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

11. The reciprocal of resistivity is________

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

13. Resistance of any circuit depends on –

14. Magnetic circuit is a closed path followed by –

15. The resistance of straight conductor is independent of-

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

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

18. Paramagnetic materials are –

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

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

21. S.I unit of conductance is –

22. Magnetic field has -

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

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

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

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

27. Which is the most cost efficient connection?

28. Which of the following is unit less?

29. The expression for energy of an inductor

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

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

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

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

34. What is the resistivity of Copper?

35. Many resistors connected in series will?

36. Reactive power is the product of

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

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

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

40. The voltage across the short is?

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

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

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

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

45. Transformer is a

46. The voltage across the open circuit is?

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

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

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

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

51. Magnetic field strength is

52. The total resistance between A and B are?

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

54. The unit of magnetic flux is –

55. The energy per unit charge is

56. Voltage across the 60 ohm resistor is______

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

58. Magnetic field is proportional to the –

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

60. The Inductor doesn’t allow sudden changes in

61. Magnetic lines of forces –

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

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

64. Unit of impedance is

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

66. The capacitor doesn’t allow sudden changes in

67. S.I unit of Power is –

68. The reciprocal of permeability is –

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

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

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

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

73. The length of a phasor represents the amplitude

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

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

76. The principle of electromagnetic induction was propounded by

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

78. Magnetic lines of forces –

79. The frequency of an alternating current is –

80. S.I unit of Reluctance-

81. The power factor of an ordinary electric bulb is

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

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

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

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

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

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

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

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

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

91. Transformer core are laminated in order to reduce –

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

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

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

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

96. 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?

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

98. 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

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

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