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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction of stator flux
Insufficient data
None of the listed here
Always revolves in the direction opposite to stator flux

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Delta
Partly star and partly delta
None of the listed here
Star

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Increases the rotor current
Decreases the rotor current
Rotor current becomes zero
Rotor current remains same

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Phase sequence of supply voltage
Magnitude of supply voltage
Supply frequency
Number of poles

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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
Using DOL starter
Proper ventilation

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