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Multiple Choice Question (MCQ) of Induction Motors page-7

61. Single phase induction motor can be made self-starting by

a) Adding series combination of capacitor and auxiliary winding in parallel with the main winding
b) Adding an auxiliary winding in parallel with the main winding
c) Adding an auxiliary winding in series with a capacitor and the main winding
d) None of these

Ans: (a)

62. Which of the following single phase motors does not have constant speed characteristic?

a) Reluctance motor
b) Hysteresis motor
c) Universal motor
d) All of the above

Ans: (c)

63. For the same rating which of the following motors has the highest starting torque?

a) Universal motor
b) Split phase motor
c) Synchronous motor
d) All have identical starting torque

Ans: (a)

64. All single phase motors have

a) Large starting torque
b) Zero starting torque
c) Medium starting torque
d) Very small starting torque

Ans: (b)

65. If a single phase motor fails to start, the probable cause may be

a) Open circuit in auxiliary winding
b) Open circuit in many winding
c) Blown fuses
d) Any of the above

Ans: (d)

66. Single phase motors generally get overheated due to

a) Overloading
b) Short winding
c) Bearing troubles
d) Any of above

Ans: (d)

67. The speed of the split phase induction motor can be reversed by reversing the leads of

a) Auxiliary winding
b) Mani winding
c) Either (a) or (b)
d) Speed can not be reversed

Ans: (c)

68. If a single phase motor runs slow, it may be due to

a) Overload
b) Low frequency
c) Low voltage
d) Any of these

Ans: (d)

69. A capacitor start single phase induction motor will usually have power factor of

a) Units
b) 0.6 leading
c) 0.8 leading
d) 0.6 lagging

Ans: (d)

70. Which of the following single phase motors is cheapest?

a) Capacitor run motor
b) Capacitor start motor
c) Reluctance motor
d) All have almost the same cost

Ans: (b)

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