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Three Phase Induction Motors

Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Series
Slip ring
Synchronous
Commutator

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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
A four speed squirrel cage induction motor uses______ stator windings.

One
Two
Three
Four

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

About the same
Less than
None of the listed here
More than

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Bronze
Cast iron
Silicon steel
Aluminium

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

1
0.2
0.5
Practically zero

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