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Three Phase Induction Motors

Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Delta
Partly star and partly delta
None of the listed here
Star

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply frequency
None of these
Copper losses in motor
Supply voltage

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

It requires less maintenance
External resistance can be inserted in the rotor circuit
None of the listed here
It is inexpensive

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

Self induction
Mutual induction
Hysteresis
Eddy currents

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

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

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

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

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