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Three Phase Induction Motors

Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Smaller
Bigger
Same
Any of the listed here

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Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

None of these
Stator core
Bearings
Shaft

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

200 W
20 W
980 W
500 W

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

Low resistance
high resistance
High reactance
Large slip

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

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

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

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

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