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Three Phase Induction Motors

Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

40%
None of the listed here
65%
90%

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

Provides high starting torque
Has simple and rugged construction
None of the listed here
Provides fine speed control

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply frequency
Copper losses in motor
None of these
Supply voltage

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

Cascade control
Pole changing
Rheostatic control
None of the listed here

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Three Phase Induction Motors
The term cogging is associated with

Induction motors
Three phase transformer
Dc series motors
Compound generators

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

None of the listed here
Less than
About the same
More than

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