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Electrical Machines

Electrical Machines
Compensating winding is placed in the

 pole shoe
 main field
 armature core
All of these

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 92%
 95%
 94%
 96%

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Electrical Machines
The working principle of transformer depends on

 Amperes law.
 Coulombs law.
 Faradays law of electromagnetic induction.
 Newtons law.

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Electrical Machines
The constant losses in transformer is/are

 copper loss.
 hysteresis loss.
 both 2 and 3.
 eddy current loss.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 Increases cost.
All of these
 increases hysteresis loss.
 makes the material brittle.

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 25%
 5%
 2%
 4%

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MORE MCQ ON Electrical Machines

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