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Three Phase Induction Motors

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

Large
Small
Practically zero
None of the listed here

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

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

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Three Phase Induction Motors
Less maintenance troubles are experienced in terms of

Slip ring induction motor
None of the listed here
Squirrel cage induction motor
Both squirrel cage and slip ring

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Uniform torque
Less rotor losses
Greater mechanical strength
None of the listed here

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

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

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Three Phase Induction Motors
The no load speed of an induction motor depends on

The maximum flux/poles
The supply frequency
The number of its poles
Both supply frequency and number of poles

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