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Three Phase Induction Motors

Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Same
Smaller
Bigger
Any of the listed here

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

8 poles
4 poles
6 poles
2 poles

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

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

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Three Phase Induction Motors
The condition of induction motor at no load resemble those of a transformer whose secondady is _______

Open circuited
None of the listed here
Supplying a variable resistive load
Short-circuited

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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 _____

50 Hz
25 Hz
None of the listed here
60 Hz

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

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

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