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Three Phase Induction Motors

Three Phase Induction Motors
The induction motor has lagging power factor during

Starting only
Operation only
Both starting and operation
None of the listed here

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction of stator flux
None of the listed here
Always revolves in the direction opposite to stator flux
Insufficient data

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

Directly proportional to
None of the listed here
Independent of
Directly proportional to sqaure of

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Three Phase Induction Motors
Slip rings are usually made of

Aluminium
Copper
Carbon
Phospor bronze

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

S × rotor input
(1-S) × rotor input
(1+S) × rotor input
(S-1) × rotor input

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

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

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