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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

None of the listed here
Rheostatic control
Pole changing
Cascade control

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

None of the listed here
Minimum at no load
Remains the same at all loads
Maximum at no load

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Three Phase Induction Motors
An induction motor is

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

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

Steady
None of the listed here
Alternating
Rotating

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

1000 rpm
1440 rpm
730 rpm
2880 rpm

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