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Three Phase Induction Motors

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

0.2
1
Practically zero
0.5

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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
1600 rpm
400 rpm
2400 rpm

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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
1000 rpm
300 rpm
1200 rpm

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

2 to 5 %
20 to 30 %
10 to 20 %
None of the listed here

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Three Phase Induction Motors
In an induction motor if air gap increased

Windage losses will be more
The power factor will be low
Bearing friction will reduce
Copper loss will reduce

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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 _______

200 W
500 W
20 W
980 W

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