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Three Phase Induction Motors

Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

4 cm to 6 cm
1 cm to 2 cm
0.4 mm to 4 mm
2 cm to 4 cm

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Three Phase Induction Motors
Slip rings are usually made of

Aluminium
Phospor bronze
Copper
Carbon

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Copper losses in motor
None of these
Supply frequency
Supply voltage

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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
60 Hz
None of the listed here
50 Hz

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

6 poles
4 poles
8 poles
2 poles

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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 _____

1000 rpm
300 rpm
600 rpm
1200 rpm

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