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Electrical Engineering - Polyphase Induction Motors MCQs
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Avg score: 26% • Most missed: “An induction motor with 1000 r.p.m. speed will have”
Electrical Engineering - Polyphase Induction Motors MCQs
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25 Questions

1. In a squirrel cage motor the induced e.m.f. is
2. A squirrel cage induction motor is not selected when
3. In a star-delta starter of an induction motor
4. In induction motor, percentage slip depends on
5. If an induction motor with certain ratio of rotor to stator slots, runs at 1/7 of the normal speed, the phenomenon will be termed as
6. In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be
7. Low voltage at motor terminals is due to
8. In case of the induction motors the torque is
9. The power scale of circle diagram of an induction motor can be found from
10. In an induction motor if air-gap is increased
11. In three-phase squirrel-cage induction motors
12. As load on an induction motor goes on increasing
13. In an induction motor, no-load the slip is generally
14. The starting torque of a three phase induction motor can be increased by
15. It is advisable to avoid line-starting of induction motor and use starter because
16. For driving high inertia loods best type of induction motor suggested is
17. Less maintenance troubles are experienced in case of
18. In case of 3-phase induction motors, plugging means
19. What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero ?
20. A change of 4% of supply voltage to an induction motor will produce a change of appromimately
21. The good power factor of an induction motor can be achieved if the average flux density in the air gap is
22. Slip ring motor is preferred over squirrel cage induction motor where
23. The power factor of an induction motor under no-load conditions will be closer to
24. The shaft of an induction motor is made of
25. Rotor rheostat control method of speed control is used for

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