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Three Phase Induction Motors

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

Supply voltage
Copper losses in motor
Supply frequency
None of these

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

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

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Three Phase Induction Motors
The low power factor of induction motor is due to

The reactive lagging magnetizing current necessary to generate the magnetic flux
Rotor leakage reactance
All of these
Stator reactance

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

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

Cascade control
Rheostatic control
Pole changing
None of the listed here

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

Even number
Equal to stator poles
Prime number
None of the listed here

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