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Three Phase Induction Motors

Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Small
Absent
Large
Infinity

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

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

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

2.5 Hz
5 Hz
0.05 Hz
1.5 Hz

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Three Phase Induction Motors
A 3 phase induction motor is ________

Very costly
Not easily maintainable
A variable speed motor
Essentially a constant speed motor

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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

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

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Three Phase Induction Motors
The term cogging is associated with

Induction motors
Three phase transformer
Dc series motors
Compound generators

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