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Three Phase Induction Motors

Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

0.05 Hz
5 Hz
1.5 Hz
2.5 Hz

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Three Phase Induction Motors
The rotor of induction motor

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

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

Supply voltage
None of these
Supply frequency
Copper losses in motor

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

Directly proportional to sqaure of
None of the listed here
Independent of
Directly proportional to

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Commutator
Synchronous
Series
Slip ring

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

Remains unchanged
None of the listed here
Is decreased
Is increased

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