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QUESTIONS

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

Smaller than
Equal to
None of the listed here
Greater than

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

1200 rpm
300 rpm
1000 rpm
600 rpm

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Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

0.5
Practically zero
1
0.2

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

1
0
0.1
0.5

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

25 Hz
None of the listed here
50 Hz
60 Hz

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