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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase induction motor is ________

Very costly
A variable speed motor
Essentially a constant speed motor
Not easily maintainable

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

None of the listed here
Prime number
Equal to stator poles
Even number

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

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

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Three Phase Induction Motors
The term cogging is associated with

Three phase transformer
Compound generators
Induction motors
Dc series motors

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

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

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Three Phase Induction Motors
Reduced voltage starter can be used with

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

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