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QUESTIONS

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

Greater than
None of the listed here
Smaller than
Equal to

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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 _____

600 rpm
300 rpm
1000 rpm
1200 rpm

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

Practically zero
0.5
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
0.1
0.5
0

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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 _____

50 Hz
25 Hz
None of the listed here
60 Hz

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