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Three Phase Induction Motors

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

8 poles
6 poles
2 poles
4 poles

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Three Phase Induction Motors
The direction of rotation of field in a 3 phase induction motor depends upon _____

Magnitude of supply voltage
Supply frequency
Number of poles
Phase sequence of supply voltage

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Three Phase Induction Motors
The term cogging is associated with

Compound generators
Dc series motors
Three phase transformer
Induction motors

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Three Phase Induction Motors
The no load speed of an induction motor depends on

The maximum flux/poles
Both supply frequency and number of poles
The supply frequency
The number of its poles

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

Stator resistance test
All of these
Blocked rotor test
No-load test

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Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

15 to 20 %
5%
30 to 50%
10 to 15%

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