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Three Phase Induction Motors

Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

One
None
Two
Three

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

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

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Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

High resistance
None of the listed here
High inductance
Low resistance

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

None of the listed here
Rheostatic control
Pole changing
Cascade control

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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 _____

300 rpm
1000 rpm
1200 rpm
600 rpm

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