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Three Phase Induction Motors

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

Any of the listed here
Same
Bigger
Smaller

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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
Which of the following component is usually fabricated out of silicon steel?

None of these
Shaft
Bearings
Stator core

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

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

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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 _____

None of the listed here
25 Hz
50 Hz
60 Hz

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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 ______

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

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