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Three Phase Induction Motors

Three Phase Induction Motors
Slip rings are usually made of

Phospor bronze
Copper
Carbon
Aluminium

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Three Phase Induction Motors
DOL starting of induction motors is usually restricted to

Variable speed motors
High speed motors
Low horsepower motors
High horsepower motors

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

1
0.1
0.5
0

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Reducing supply voltage
Changing supply frequency
Changing number of poles
Changing winding resistance

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Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

None of the listed here
High resistance
High inductance
Low resistance

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

1-S
1+S
None of the listed here
S-1

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