SSC JE Electrical / Mock Test Series : 1

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

2. Unit of resistivity is

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

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

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

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

7. Transformer is a

8. Unit of impedance is

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

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

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

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

13. 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?

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

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

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

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

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

19. Magnetic lines of forces –

20. Magnetic field strength is

21. Reactive power is the product of

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

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

24. The unit of frequency is the hertz

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

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

27. The reciprocal of resistivity is________

28. The unit of magnetic flux is –

29. Resistance of any circuit depends on –

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

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

32. The power factor of practical inductor is

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

34. Paramagnetic materials are –

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

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

37. Transformer core are laminated in order to reduce –

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

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

40. S.I unit of Power is –

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

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

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

44. The principle of electromagnetic induction was propounded by

45. Magnetic lines of forces –

46. The power factor of an ordinary electric bulb is

47. Which of the following is unit less?

48. Voltage across the 60 ohm resistor is______

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

50. Magnetic field is proportional to the –

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

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

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

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

55. S.I unit of Reluctance-

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

57. The reciprocal of permeability is –

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

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

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

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

62. Magnetic circuit is a closed path followed by –

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

64. The capacitor doesn’t allow sudden changes in

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

66. Magnetic field has -

67. The resistance of straight conductor is independent of-

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

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

70. S.I unit of conductance is –

71. What is the resistivity of Copper?

72. The frequency of an alternating current is –

73. The voltage across the open circuit is?

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

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

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

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

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

79. The voltage across the short is?

80. The total resistance between A and B are?

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

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

83. Which is the most cost efficient connection?

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

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

86. The energy per unit charge is

87. The length of a phasor represents the amplitude

88. 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

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

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

91. The expression for energy of an inductor

92. The Inductor doesn’t allow sudden changes in

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

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

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

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

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

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

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

100. Many resistors connected in series will?