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THREE PHASE INDUCTION MOTORS

Three Phase Induction Motors
Slip rings are usually made of

Copper
Carbon
Phospor bronze
Aluminium

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

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

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

None
Two
Three
One

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Negligible
Low
Same as full load torque
Slightly more than full load torque

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

0.4 %
14%
0.04 %
4 %

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