SSC JE Electrical / Mock Test Series : 1

1. The power factor of practical inductor is

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

3. 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?

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

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

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

7. Magnetic lines of forces –

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

9. The expression for energy of an inductor

10. Paramagnetic materials are –

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

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

13. What is the resistivity of Copper?

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

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

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

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

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

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

20. The unit of magnetic flux is –

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

22. Magnetic field has -

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

24. Unit of resistivity is

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

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

27. The power factor of an ordinary electric bulb is

28. Which of the following is unit less?

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

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

31. Magnetic circuit is a closed path followed by –

32. Transformer core are laminated in order to reduce –

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

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

35. The frequency of an alternating current is –

36. Which is the most cost efficient connection?

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

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

39. The total resistance between A and B are?

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

41. The principle of electromagnetic induction was propounded by

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

43. Voltage across the 60 ohm resistor is______

44. Magnetic field is proportional to the –

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

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

47. The energy per unit charge is

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

49. Resistance of any circuit depends on –

50. Reactive power is the product of

51. The length of a phasor represents the amplitude

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

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

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

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

56. The unit of frequency is the hertz

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

58. Magnetic lines of forces –

59. Magnetic field strength is

60. The reciprocal of resistivity is________

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

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

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

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

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

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

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

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

69. S.I unit of Power is –

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

71. S.I unit of conductance is –

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

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

74. The resistance of straight conductor is independent of-

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

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

77. The reciprocal of permeability is –

78. Transformer is a

79. The voltage across the short is?

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

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

82. The Inductor doesn’t allow sudden changes in

83. S.I unit of Reluctance-

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

85. The voltage across the open circuit is?

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

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

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

89. Unit of impedance is

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

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

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

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

94. Many resistors connected in series will?

95. 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

96. The capacitor doesn’t allow sudden changes in

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

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

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

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