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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase induction motor is ________

Not easily maintainable
Very costly
A variable speed motor
Essentially a constant speed motor

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

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

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Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Large
Small
Infinity
Absent

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Small
Large
None of the listed here
Practically zero

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Slip ring
Series
Commutator
Synchronous

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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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