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Three Phase Induction Motors

Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

None of the listed here
Star
Partly star and partly delta
Delta

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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.

Equal to
Two times
Four times
None of the listed here

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Small
Large
Practically zero
None of the listed here

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

Large slip
high resistance
High reactance
Low resistance

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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
Maximum at no load
Remains the same at all loads

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Three Phase Induction Motors
The rotor of an induction motor runs at

Above synchronous speed
Below synchronous speed
Synchronous speed
Any of the above

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