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Three Phase Induction Motors

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
The frame of an induction motor is usually made of

Aluminium
Bronze
Silicon steel
Cast iron

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

About the same
More than
Less than
None of the listed here

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Practically zero
Small
Large
None of the listed here

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Three Phase Induction Motors
Slip rings are usually made of

Aluminium
Carbon
Copper
Phospor bronze

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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 _____

1200 rpm
1000 rpm
300 rpm
600 rpm

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