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Three Phase Induction Motors

Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

None of these
Bearings
Stator core
Shaft

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

20 W
980 W
200 W
500 W

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

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

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Half full load
No load
Full load
Starting

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Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Absent
Large
Infinity
Small

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

1-S
1+S
S-1
None of the listed here

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