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Polyphase Induction Motors - Interview Questions and Answers

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76. Less maintenance troubles are experienced in case of
A. slip ring induction motor
B. squirrel cage induction motor
C. both (a) and (b)
D. none of the above
Explanation:
77. A squirrel cage induction motor is not selected when
A. initial cost is the main consideration
B. maintenance cost is to be kept low
C. higher starting torque is the main consideration
D. all above considerations are involved
Explanation:
78. The term 'cogging' is associated with
A. three phase transformers
B. compound generators
C. D.C. series motors
D. induction motors
Explanation:
79. In an induction motor if air-gap is increased
A. the power factor will be low
B. windage losses will be more
C. bearing friction will reduce
D. copper loss will reduce In an induction motor
Explanation:
80. Insertion of reactance in the rotor circuit
A. reduces starting torque as well as maximum torque
B. increases starting torque as well as maximum torque
C. increases starting torque but maxi-mum torque remains unchanged
D. increases starting torque but maxi-mum torque decreases
Explanation:
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