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Three Phase Induction Motors

Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Rotor current
Slip
Line voltage
Running torque

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

Commutator
Series
Slip ring
Synchronous

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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 ______

Is increased
Remains unchanged
Is decreased
None of the listed here

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Rotor current becomes zero
Decreases the rotor current
Rotor current remains same
Increases the rotor current

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Three Phase Induction Motors
The maximum torque of a 3-phase induction motor under running conditions is

Inveresly proportional to supply voltage
None of the listed here
Directly proportional to rotor resistance
inversely proportional to rotor reactance at standstill

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply frequency
Copper losses in motor
Supply voltage
None of these

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