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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
High loads
Improper design of machine

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

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

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Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

Large
As small as possible
Very large
1

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

Has simple and rugged construction
Provides high starting torque
None of the listed here
Provides fine speed control

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Three Phase Induction Motors
Less maintenance troubles are experienced in terms of

Both squirrel cage and slip ring
Squirrel cage induction motor
None of the listed here
Slip ring induction motor

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Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

High resistance
High inductance
None of the listed here
Low resistance

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