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Three Phase Induction Motors

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

6 poles
4 poles
2 poles
8 poles

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

Less costly motor is not required
High rotor resistance is required during running
High starting torque is required
Speed control is required

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always greater than the number of
Always less than the number of
Always eqaul to the number of
Either more or less than the number of

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

Large slip
Low resistance
high resistance
High reactance

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Three Phase Induction Motors
The crawling in an induction motor is caused by

High loads
Improper design of machine
Harmonics developed in the rotor
Low voltage supply

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Star
Delta
None of the listed here
Partly star and partly delta

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