SSC JE Electrical / Mock Test Series : 1

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

2. The power factor of an ordinary electric bulb is

3. The Inductor doesn’t allow sudden changes in

4. The unit of frequency is the hertz

5. The unit of magnetic flux is –

6. 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?

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

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

9. Unit of impedance is

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

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

12. Magnetic lines of forces –

13. Transformer core are laminated in order to reduce –

14. The reciprocal of permeability is –

15. Magnetic field has -

16. The voltage across the short is?

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

18. The length of a phasor represents the amplitude

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

20. Paramagnetic materials are –

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

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

23. The voltage across the open circuit is?

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

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

26. The capacitor doesn’t allow sudden changes in

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

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

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

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

31. S.I unit of Reluctance-

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

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

34. Reactive power is the product of

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

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

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

38. The power factor of practical inductor is

39. Many resistors connected in series will?

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

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

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

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

44. The total resistance between A and B are?

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

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

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

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

49. Resistance of any circuit depends on –

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

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

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

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

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

55. The frequency of an alternating current is –

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

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

58. Magnetic field strength is

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

60. Unit of resistivity is

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

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

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

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

65. Magnetic field is proportional to the –

66. The reciprocal of resistivity is________

67. S.I unit of conductance is –

68. 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

69. The energy per unit charge is

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

71. Magnetic circuit is a closed path followed by –

72. Voltage across the 60 ohm resistor is______

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

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

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

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

77. Which of the following is unit less?

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

79. S.I unit of Power is –

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

81. Transformer is a

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

83. The expression for energy of an inductor

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

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

86. What is the resistivity of Copper?

87. Which is the most cost efficient connection?

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

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

90. The principle of electromagnetic induction was propounded by

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

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

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

94. Magnetic lines of forces –

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

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

97. The resistance of straight conductor is independent of-

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

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

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