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Three Phase Induction Motors

Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

None
One
Two
Three

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Large
Small
None of the listed here
Practically zero

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

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

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Three Phase Induction Motors
An induction motor is

Non self starting
Self starting with zero torque
Self starting with low torque
Self starting with high torque

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

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

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Three Phase Induction Motors
A 3 phase induction motor is ________

Essentially a constant speed motor
A variable speed motor
Not easily maintainable
Very costly

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