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Three Phase Induction Motors

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
In an induction motor, the ratio of rotor cu loss and rotor input is given by

S/1-S
1-S
S
1/S

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

20 Hz
50 Hz
2 Hz
200 Hz

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are decreased
No load current is decreased
Leakage reactances are increased
None of the listed here

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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
In induction motor, percentage slip depends on

Supply frequency
Supply voltage
Copper losses in motor
None of these

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