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Three Phase Induction Motors

Three Phase Induction Motors
The shaft of induction motor is made of

Flexible
Any of the listed here
Hollow
Stiff

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Three Phase Induction Motors
The power factor of an induction motor under no load conditions will be closer to

0.2 leading
0.2 lagging
Unity
0.5 leading

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

External resistance can be inserted in the rotor circuit
It requires less maintenance
None of the listed here
It is inexpensive

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Three Phase Induction Motors
The low power factor of induction motor is due to

Rotor leakage reactance
Stator reactance
The reactive lagging magnetizing current necessary to generate the magnetic flux
All of these

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Three Phase Induction Motors
Reduced voltage starter can be used with

Squirrel cage as well as slip ring induction motor
None of these
Squirrel cage induction motor only but not with slip ring motor
Slip ring motor only but not with squirrel cage induction motor

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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.

Two times
None of the listed here
Equal to
Four times

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