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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

Slip ring induction motor
Squirrel cage induction motor
None of these
Both (A) and (B)

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Having number of rotor slots more or less than the number of stator slots
Auto transformer starter
Proper ventilation
Using DOL starter

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

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

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

None of the listed here
Remains unchanged
Is increased
Is decreased

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

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

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