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Three Phase Induction Motors

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

Shaft
Stator core
Bearings
None of these

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

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

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Three Phase Induction Motors
The term cogging is associated with

Three phase transformer
Induction motors
Dc series motors
Compound generators

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Commutator
Synchronous
Series
Slip ring

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Three Phase Induction Motors
The no load speed of an induction motor depends on

Both supply frequency and number of poles
The supply frequency
The maximum flux/poles
The number of its poles

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

980 W
200 W
500 W
20 W

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