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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The low power factor of induction motor is due to

All of these
Rotor leakage reactance
The reactive lagging magnetizing current necessary to generate the magnetic flux
Stator reactance

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Half full load
Starting
No load
Full load

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Bigger
Any of the listed here
Smaller
Same

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

1.5 %
2%
Less than 1%
4%

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

2 poles
4 poles
6 poles
8 poles

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MORE MCQ ON Three Phase Induction Motors

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