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Three Phase Induction Motors

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

None of these
Supply frequency
Copper losses in motor
Supply voltage

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

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

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

99%
60 to 90%
95 to 98 %
80 to 90%

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

None of the listed here
Decreased at starting
Increased under running conditions
Increased at starting

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

None of the listed here
Both squirrel cage and slip ring
Squirrel cage induction motor
Slip ring induction motor

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Line voltage
Running torque
Slip
Rotor current

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