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Three Phase Induction Motors

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

Slip
Rotor current
Running torque
Line voltage

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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
50 Hz
None of the listed here
60 Hz

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

4 poles
8 poles
6 poles
2 poles

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

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

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Less rotor losses
Greater mechanical strength
None of the listed here
Uniform torque

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

10 to 20 %
2 to 5 %
20 to 30 %
None of the listed here

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