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Polyphase Induction Motors - Interview Questions and Answers

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56. An induction motor with 1000 r.p.m. speed will have
A. 8 poles
B. 6 poles
C. 4 poles
D. 2 poles
Explanation:
57. Which type of bearing is provided in small induction motors to support the rotor shaft ?
A. Ball bearings
B. Cast iron bearings
C. Bush bearings
D. None of the above
Explanation:
58. A 3-phase slip ring motor has
A. double cage rotor
B. wound rotor
C. short-circuited rotor
D. any of the above
Explanation:
59. The circle diagram for an induction motor cannot be used to determine
A. efficiency
B. power factor
C. frequency
D. output
Explanation:
60. The shape of the torque/slip curve of induction motor is
A. parabola
B. hyperbola
C. rectangular parabola
D. straigth line
Explanation:
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