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Three Phase Induction Motors

Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1200 rpm
1600 rpm
2400 rpm
400 rpm

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

None of the listed here
Star
Delta
Partly star and partly delta

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

2 poles
8 poles
6 poles
4 poles

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are increased
Leakage reactances are decreased
None of the listed here
No load current is decreased

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Small
None of the listed here
Practically zero
Large

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Three Phase Induction Motors
The crawling in an induction motor is caused by

Low voltage supply
Improper design of machine
High loads
Harmonics developed in the rotor

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