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Three Phase Induction Motors

Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Delta
Star
None of the listed here
Partly star and partly delta

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

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

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Running torque
Slip
Line voltage
Rotor current

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Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

10 to 15%
30 to 50%
5%
15 to 20 %

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Three Phase Induction Motors
In induction motor, percentage slip depends on

None of these
Supply voltage
Copper losses in motor
Supply frequency

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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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