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Three Phase Induction Motors

Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

730 rpm
2880 rpm
1000 rpm
1440 rpm

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Three Phase Induction Motors
The rotor of an induction motor runs at

Any of the above
Synchronous speed
Below synchronous speed
Above synchronous speed

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

6 poles
8 poles
2 poles
4 poles

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

20 to 30 %
2 to 5 %
None of the listed here
10 to 20 %

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

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

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Same as full load torque
Slightly more than full load torque
Negligible
Low

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