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Three Phase Induction Motors

Three Phase Induction Motors
An induction motor is so called because its operation depends on

Mutual induction
Hysteresis
Self induction
Eddy currents

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Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

Three
One
None
Two

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

1000 rpm
300 rpm
1200 rpm
600 rpm

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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 efficiency of an induction motor can be expected to be nearly

60 to 90%
80 to 90%
99%
95 to 98 %

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Three Phase Induction Motors
Slip rings are usually made of

Carbon
Aluminium
Phospor bronze
Copper

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