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Three Phase Induction Motors

Three Phase Induction Motors
Slip rings are usually made of

Carbon
Copper
Aluminium
Phospor bronze

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Bigger
Smaller
Any of the listed here
Same

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

Running torque
Line voltage
Rotor current
Slip

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

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

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

(1-S) × rotor input
None of the listed here
(1+S) × rotor input
S × rotor input

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

25 Hz
60 Hz
50 Hz
None of the listed here

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MORE MCQ ON Three Phase Induction Motors

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