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Three Phase Induction Motors

Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Slightly more than full load torque
Low
Negligible
Same as full load torque

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Decreasing rotor resistance
Increasing rotor reactance
Increasing rotor resistance
None of the listed here

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Mutual induction
Self induction
Hysteresis
Eddy currents

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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
Any of the listed here
Smaller
Same

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

6 poles
8 poles
4 poles
2 poles

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

Is increased
None of the listed here
Is decreased
Remains unchanged

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