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Three Phase Induction Motors

Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(S-1) × rotor input
S × rotor input
(1+S) × rotor input
(1-S) × rotor input

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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 ______

None of the listed here
Uniform torque
Greater mechanical strength
Less rotor losses

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Three Phase Induction Motors
The rotor of induction motor

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

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

High rotor resistance is required during running
Speed control is required
Less costly motor is not required
High starting torque is required

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Three Phase Induction Motors
The term cogging is associated with

Three phase transformer
Dc series motors
Induction motors
Compound generators

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

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

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