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Three Phase Induction Motors

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

Stiff
Any of the listed here
Hollow
Flexible

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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
None of the listed here
Greater mechanical strength

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Shaft diameter
Rotor current
Rotor power factor
Rotor emf

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

None of the listed here
Large
Small
Practically zero

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Three Phase Induction Motors
Slip rings are usually made of

Phospor bronze
Carbon
Copper
Aluminium

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Using DOL starter
Proper ventilation
Auto transformer starter
Having number of rotor slots more or less than the number of stator slots

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