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Polyphase Induction Motors - Interview Questions and Answers

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16. A double squirrel-cage induction motor has
A. two rotors moving in oppsite direction
B. two parallel windings in stator
C. two parallel windings in rotor
D. two series windings in stator
Explanation:
17. In an induction motor the relationship between stator slots and rotor slots is that
A. stator slots are equal to rotor slots
B. stator slots are exact multiple of rotor slots
C. stator slots are not exact multiple of rotor slots
D. none of the above
Explanation:
18. In the circle diagram for induction motor, the diameter of the circle represents
A. slip
B. rotor current
C. running torque
D. line voltage
Explanation:
19. An induction motor is
A. self-starting with zero torque
B. self-starting with high torque
C. self-starting with low torque
D. non-self starting
Explanation:
20. Stepless speed control of induction motor is possible by which of the following methods ?
A. e.m.f. injection in rotor eueuit
B. Changing the number of poles
C. Cascade operation
D. None of the above
Explanation:
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