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Three Phase Induction Motors

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 no load speed of an induction motor depends on

The maximum flux/poles
The supply frequency
The number of its poles
Both supply frequency and number of poles

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

All of the listed here
Rotor inductive reactance
Frequency
Square of supply voltage

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

None of the listed here
Equal to
Smaller than
Greater than

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Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1200 rpm
2400 rpm
1600 rpm
400 rpm

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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

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

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