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Polyphase Induction Motors - Interview Questions and Answers

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66. A change of 4% of supply voltage to an induction motor will produce a change of appromimately
A. 4% in the rotor torque
B. 8% in the rotor torque
C. 12% in the rotor torque
D. 16% in the rotor torque
Explanation:
67. In case of the induction motors the torque is
A. inversely proportional to (Vslip)
B. directly proportional to (slip)2
C. inversely proportional to slip
D. directly proportional to slip
Explanation:
68. The purpose of using short-circuit gear is
A. to short circuit the rotor at slip rings
B. to short circuit the starting resis�tances in the starter
C. to short circuit the stator phase of motor to form star
D. none of the above
Explanation:
69. Insertion of resistance in the rotcir of an induction motor to develop a given torque
A. decreases the rotor current
B. increases the rotor current
C. rotor current becomes zero
D. rotor current rernains same
Explanation:
70. Insertion of resistance in the stator of an induction motor
A. increases the load torque
B. decreases the starting torque
C. increases the starting torque
D. none of the above
Explanation:
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