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Three Phase Induction Motors

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 speed of a squirrel cage induction motor is changed by

Pole changing
None of the listed here
Cascade control
Rheostatic control

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

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

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Three Phase Induction Motors
The condition of induction motor on load resemble those of a transformer whose secondady is _______

Open circuited
Short circuited
None of the listed here
Supplying a variable resistive load

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Three Phase Induction Motors
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______

None of the listed here
Is decreased
Remains unchanged
Is increased

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

S × rotor input
(1-S) × rotor input
None of the listed here
(1+S) × rotor input

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