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Three Phase Induction Motors

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

Small
Practically zero
Large
None of the listed here

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

Large
As small as possible
1
Very large

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

1000 rpm
730 rpm
1440 rpm
2880 rpm

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Half full load
Starting
Full load
No load

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased two times
Decreased two times
Decreased four times
Increased four times

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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 ______

Is increased
Is decreased
Remains unchanged
None of the listed here

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