single phase induction motors Mcqs
101. A universal motor can run on___________?
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A. A.C. only

B. either A.C. or D.C.

C. D.C. only

D. none of the above

102. Which of the following statements regarding reluctance-start motor is incorrect ?
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A. So far as its basic working principle is concerned, it is similar to shaded pole motor

B. It is basically an induction motor and not a synchronous one

C. It is similar to reluctance motor

D. the air-gap between rotor and salient poles is non- uniform

103. Torque developed by a single phase induction motor at starting is_____________?
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A. uniform

B. pulsating

C. nil

D. none of the above

104. In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?
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A. draw excessive armature current and may burn out

B. fall out of synchronism and come to stand still

C. run as induction motor

D. become unstable

105. In case of high speed universal motor which of the following needs more attention?
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A. End play

B. Air gap

C. Insulation in rotor

D. Balancing of rotor
106. Which of the following motors is used in mixies ?
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A. Repulsion motor

B. Hysteresis motor

C. Reluctance motor

D. Universal motor
107. Direction of rotation of a split phase motor can be reversed by reversing the connection of__________?
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A. running winding only

B. starting winding only

C. either A. or (b)

D. both A. and (b)

108. The value of starting capacitor of a fractional horse power motor will be__________?
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A. 300 uF

B. 200 uF

C. 400 uF

D. 100 uF

109. In a hysteresis motor, the rotor must have____________?
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A. none of the above

B. susceptibility

C. retentivity

D. resistivity

110. A repulsion motor is equipped with__________?
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A. slip rings

B. commutator

C. both A. and (b)

D. none of the above