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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase induction motor is ________

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

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Three Phase Induction Motors
The low power factor of induction motor is due to

All of these
Stator reactance
Rotor leakage reactance
The reactive lagging magnetizing current necessary to generate the magnetic flux

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Three Phase Induction Motors
The shaft of induction motor is made of

Flexible
Hollow
Any of the listed here
Stiff

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

None of the listed here
(1-S) × rotor input
S × rotor input
(1+S) × rotor input

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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?

2880 rpm
1000 rpm
730 rpm
1440 rpm

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Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

4 cm to 6 cm
0.4 mm to 4 mm
1 cm to 2 cm
2 cm to 4 cm

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