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Three Phase Induction Motors

Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Absent
Infinity
Small
Large

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Three Phase Induction Motors
Slip rings are usually made of

Copper
Carbon
Phospor bronze
Aluminium

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

None of these
Copper losses in motor
Supply voltage
Supply frequency

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

Less than
More than
About the same
None of the listed here

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Same as full load torque
Negligible
Slightly more than full load torque
Low

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

None of the listed here
(1-S) × rotor input
(1+S) × rotor input
S × rotor input

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