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Three Phase Induction Motors

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
The low power factor of induction motor is due to

Rotor leakage reactance
All of these
The reactive lagging magnetizing current necessary to generate the magnetic flux
Stator reactance

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

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

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Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

Two
Three
One
None

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Greater mechanical strength
Less rotor losses
Uniform torque
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 ______

Is decreased
Is increased
None of the listed here
Remains unchanged

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