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Three Phase Induction Motors

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

8 poles
2 poles
4 poles
6 poles

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Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

Three
Two
One
None

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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
1000 rpm
2880 rpm
1440 rpm

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased four times
Decreased two times
Decreased four times
Increased two times

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

2.5 Hz
5 Hz
1.5 Hz
0.05 Hz

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply voltage
Supply frequency
Copper losses in motor
None of these

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MORE MCQ ON Three Phase Induction Motors

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