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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

Alternating
Steady
Rotating
None of the listed here

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Three Phase Induction Motors
The power factor of an induction motor under no load conditions will be closer to

0.2 lagging
Unity
0.5 leading
0.2 leading

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Three Phase Induction Motors
Slip rings are usually made of

Copper
Aluminium
Carbon
Phospor bronze

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

1000 rpm
600 rpm
1200 rpm
300 rpm

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

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

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