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Three Phase Induction Motors

Three Phase Induction Motors
The rotor of an induction motor runs at

Above synchronous speed
Below synchronous speed
Synchronous speed
Any of the above

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

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

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

1
0.5
0.1
0

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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

Smaller
Same
Bigger
Any of the listed here

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Three Phase Induction Motors
The induction motor has lagging power factor during

Operation only
None of the listed here
Both starting and operation
Starting only

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Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

65%
90%
None of the listed here
40%

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