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Three Phase Induction Motors

Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

4 cm to 6 cm
2 cm to 4 cm
0.4 mm to 4 mm
1 cm to 2 cm

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

None of the listed here
Provides fine speed control
Provides high starting torque
Has simple and rugged construction

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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
Remains unchanged
None of the listed here
Is decreased

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Three Phase Induction Motors
An induction motor is

Self starting with zero torque
Non self starting
Self starting with low torque
Self starting with high torque

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

About the same
Less than
More than
None of the listed here

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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 two times
Decreased four times
Decreased two times
Increased four times

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