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Three Phase Induction Motors

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

Cast iron
Carbon steel
High speed steel
Stainless steel

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

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

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

High inductance
None of the listed here
Low resistance
High resistance

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

200 Hz
50 Hz
2 Hz
20 Hz

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

One
Three
None
Two

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Maximum at no load
Minimum at no load
Remains the same at all loads
None of the listed here

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