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Three Phase Induction Motors

Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

None of the listed here
Rotating
Steady
Alternating

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

Remains unchanged
Is decreased
Is increased
None of the listed here

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Three Phase Induction Motors
The induction motor has lagging power factor during

None of the listed here
Both starting and operation
Operation only
Starting only

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Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

0.5
1
Practically zero
0.2

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

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

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Self induction
Hysteresis
Mutual induction
Eddy currents

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