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Three Phase Induction Motors

Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Synchronous
Slip ring
Commutator
Series

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

0.4 %
0.04 %
14%
4 %

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Three Phase Induction Motors
DOL starting of induction motors is usually restricted to

High horsepower motors
Low horsepower motors
High speed motors
Variable speed motors

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

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

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

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

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

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

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