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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

980 W
20 W
200 W
500 W

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased four times
Increased two times
Decreased four times
Decreased two times

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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
0.2 leading
Unity
0.2 lagging

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Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

Two times
Four times
Equal to
None of the listed here

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Three Phase Induction Motors
The crawling in an induction motor is caused by

Harmonics developed in the rotor
Improper design of machine
Low voltage supply
High loads

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

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