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Polyphase Induction Motors - Interview Questions and Answers

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31. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor
A. will continue running burning its one phase
B. will continue running burning its two phases
C. will stop and carry heavy current causing permanent damage to its winding
D. will continue running without any harm to the winding
Explanation:
32. For which motor the speed can be controlled from rotor side ?
A. Squirrel-cage induction motor
B. Slip-ring induction motor
C. Both (a) and (b)
D. None of the above
Explanation:
33. When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered
A. in series
B. in parallel
C. in series-parallel
D. in parallel with stator
Explanation:
34. The number of slip rings on a squirrel cage induction motor is usually
A. two
B. three
C. four
D. none
Explanation:
35. Slip ring motor is recommended where
A. speed control is required
B. frequent starting, stopping and reversing is required
C. high starting torque is needed
D. all above features are required
Explanation:
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