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Three Phase Induction Motors

Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Equal to
Greater than
Smaller than
None of the listed here

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

4 %
14%
0.4 %
0.04 %

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

Running torque
Slip
Rotor current
Line voltage

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will burn
The motor will run at reduced speed
The motor will not run
The motor will run in reverse direction

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Three Phase Induction Motors
Slip rings are usually made of

Copper
Aluminium
Phospor bronze
Carbon

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

Large
Practically zero
Small
None of the listed here

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