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Three Phase Induction Motors

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

1
As small as possible
Very large
Large

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Three Phase Induction Motors
Less maintenance troubles are experienced in terms of

None of the listed here
Squirrel cage induction motor
Both squirrel cage and slip ring
Slip ring induction motor

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

0.5 leading
Unity
0.2 leading
0.2 lagging

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

4 poles
2 poles
8 poles
6 poles

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always greater than the number of
Always less than the number of
Either more or less than the number of
Always eqaul to the number of

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Three Phase Induction Motors
The induction motor has lagging power factor during

Starting only
None of the listed here
Operation only
Both starting and operation

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