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Three Phase Induction Motors

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

High speed steel
Cast iron
Stainless steel
Carbon steel

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

Three
Two
Four
One

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

500 W
200 W
20 W
980 W

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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
None of the listed here
Large

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

S/1-S
S
1/S
1-S

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

None of the listed here
Delta
Star
Partly star and partly delta

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