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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction opposite to stator flux
Insufficient data
None of the listed here
Always revolves in the direction of stator flux

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Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

15 to 20 %
5%
10 to 15%
30 to 50%

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Three Phase Induction Motors
In an induction motor if air gap increased

The power factor will be low
Copper loss will reduce
Bearing friction will reduce
Windage losses will be more

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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
Full load
Starting
No load

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Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

Shaft
Bearings
None of these
Stator core

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