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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
Steady
Rotating
Alternating

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

1
0.2
Practically zero
0.5

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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

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

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

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

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always greater than the number of
Always eqaul to the number of
Either more or less than the number of
Always less than the number of

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction of stator flux
Insufficient data
None of the listed here
Always revolves in the direction opposite to stator flux

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