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Three Phase Induction Motors

Three Phase Induction Motors
The crawling in an induction motor is caused by

High loads
Improper design of machine
Harmonics developed in the rotor
Low voltage supply

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased two times
Decreased four times
Decreased two times
Increased four times

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

Speed control is required
High rotor resistance is required during running
High starting torque is required
Less costly motor is not required

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

None of the listed here
Small
Practically zero
Large

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Three Phase Induction Motors
The rotor of an induction motor runs at

Above synchronous speed
Below synchronous speed
Synchronous speed
Any of the above

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

None of the listed here
Rheostatic control
Cascade control
Pole changing

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