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Three Phase Induction Motors

Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

5 Hz
2.5 Hz
1.5 Hz
0.05 Hz

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

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

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

Bigger
Smaller
Any of the listed here
Same

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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

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

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

1200 rpm
300 rpm
600 rpm
1000 rpm

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Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1600 rpm
400 rpm
2400 rpm
1200 rpm

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