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THREE PHASE INDUCTION MOTORS

Three Phase Induction Motors
Slip rings are usually made of

Phospor bronze
Aluminium
Carbon
Copper

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

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

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

Two
Three
None
One

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

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

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

14%
4 %
0.4 %
0.04 %

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