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Three Phase Induction Motors

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

Small
None of the listed here
Practically zero
Large

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Slip ring
Commutator
Series
Synchronous

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

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

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always eqaul to the number of
Always less than the number of
Either more or less than the number of
Always greater than the number of

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Increasing rotor reactance
Increasing rotor resistance
Decreasing rotor resistance
None of the listed here

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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

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

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