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Three Phase Induction Motors

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

Bigger
Same
Smaller
Any of the listed here

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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

1.5 Hz
2.5 Hz
5 Hz
0.05 Hz

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

6 poles
2 poles
4 poles
8 poles

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

4%
1.5 %
Less than 1%
2%

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

1+S
1-S
None of the listed here
S-1

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

High reactance
Low resistance
Large slip
high resistance

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