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Three Phase Induction Motors

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

High reactance
high resistance
Large slip
Low resistance

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Three Phase Induction Motors
Less maintenance troubles are experienced in terms of

Both squirrel cage and slip ring
Slip ring induction motor
Squirrel cage induction motor
None of the listed here

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

14%
4 %
0.04 %
0.4 %

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

Slip ring induction motor
None of these
Squirrel cage induction motor
Both (A) and (B)

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

2 poles
6 poles
4 poles
8 poles

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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 _______

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

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