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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

Small
Large
Absent
Infinity

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

None of the listed here
Stator slots are exact multiple of rotor slots
Stator slots are equal to rotor slots
Stator slots are not exact multiple of rotor slots

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

Two
Three
Four
One

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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
200 Hz
2 Hz

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Three Phase Induction Motors
In an induction motor if air gap increased

The power factor will be low
Bearing friction will reduce
Copper loss will reduce
Windage losses will be more

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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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