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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The shaft of induction motor is made of

Flexible
Stiff
Any of the listed here
Hollow

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0.1
0.5
0
1

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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
If the rotor slots are made deeper, rotor resistance is ______

Decreased at starting
Increased under running conditions
None of the listed here
Increased at starting

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

Very large
Large
As small as possible
1

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