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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
Which of the following component is usually fabricated out of silicon steel?

None of these
Shaft
Bearings
Stator core

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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
None of the listed here
1+S
S-1

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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

5 Hz
2.5 Hz
1.5 Hz
0.05 Hz

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Increases the rotor current
Rotor current remains same
Rotor current becomes zero
Decreases the rotor current

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Three Phase Induction Motors
The shape of the torque/slip curve of induction motor is

Rectangular parabola
Parabola
Straight line
Hyperbola

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