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Three Phase Induction Motors

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

Straight line
Parabola
Rectangular parabola
Hyperbola

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

99%
95 to 98 %
80 to 90%
60 to 90%

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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

Any of the listed here
Smaller
Bigger
Same

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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
None of the listed here
More than

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

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

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Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

None of the listed here
Equal to
Four times
Two times

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