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Three Phase Induction Motors

Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Same as full load torque
Low
Negligible
Slightly more than full load torque

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Three Phase Induction Motors
DOL starting of induction motors is usually restricted to

High speed motors
Low horsepower motors
Variable speed motors
High horsepower motors

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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
Same
Any of the listed here
Smaller

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Three Phase Induction Motors
The rotor of induction motor

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

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

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

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Having number of rotor slots more or less than the number of stator slots
Proper ventilation
Using DOL starter
Auto transformer starter

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MORE MCQ ON Three Phase Induction Motors

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