SSC JE Electrical / Mock Test Series : 1

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

2. The Inductor doesn’t allow sudden changes in

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

4. Transformer is a

5. Magnetic lines of forces –

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

7. Which is the most cost efficient connection?

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

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

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

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

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

13. The reciprocal of resistivity is________

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

15. Transformer core are laminated in order to reduce –

16. The capacitor doesn’t allow sudden changes in

17. Magnetic lines of forces –

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

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

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

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

22. The resistance of straight conductor is independent of-

23. The voltage across the open circuit is?

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

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

26. S.I unit of Reluctance-

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

28. Magnetic circuit is a closed path followed by –

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

30. The frequency of an alternating current is –

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

32. The energy per unit charge is

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

34. The power factor of an ordinary electric bulb is

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

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

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

38. The reciprocal of permeability is –

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

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

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

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

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

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

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

46. Many resistors connected in series will?

47. Paramagnetic materials are –

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

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

50. 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?

51. Reactive power is the product of

52. Magnetic field strength is

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

54. The unit of magnetic flux is –

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

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

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

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

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

60. Unit of resistivity is

61. What is the resistivity of Copper?

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

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

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

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

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

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

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

69. Resistance of any circuit depends on –

70. The voltage across the short is?

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

72. Unit of impedance is

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

74. Magnetic field has -

75. The total resistance between A and B are?

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

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

78. Magnetic field is proportional to the –

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

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

81. Voltage across the 60 ohm resistor is______

82. The unit of frequency is the hertz

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

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

85. The expression for energy of an inductor

86. The principle of electromagnetic induction was propounded by

87. The length of a phasor represents the amplitude

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

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

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

91. 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

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

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

94. The power factor of practical inductor is

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

96. S.I unit of Power is –

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

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

99. S.I unit of conductance is –

100. Which of the following is unit less?