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Three Phase Induction Motors

Three Phase Induction Motors
The term cogging is associated with

Dc series motors
Induction motors
Three phase transformer
Compound generators

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Phase sequence of supply voltage
Number of poles
Magnitude of supply voltage
Supply frequency

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

High rotor resistance is required during running
Speed control is required
Less costly motor is not required
High starting torque is required

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

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

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Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

None of the listed here
Greater than
Smaller than
Equal to

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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
None of the listed here
Four times
Two times

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