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Three Phase Induction Motors

Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(1+S) × rotor input
S × rotor input
(S-1) × rotor input
(1-S) × rotor input

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

Stator slots are equal to rotor slots
Stator slots are not exact multiple of rotor slots
None of the listed here
Stator slots are exact multiple of rotor slots

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

No load current is decreased
Leakage reactances are increased
None of the listed here
Leakage reactances are decreased

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

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

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

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

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

Large
1
Very large
As small as possible

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