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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  rotor shaft.
  stator frame.
None of these
  pole faces.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the overall weight
 economise on the material required for interpoles and their windings
 reduce the saturation in the interpole
 increase the acceleration of commutation

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 16/9.
 9/16.
 3/4.
 4/3.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 59 / 3.
  slip X 50 / 3.
 1.
  slip X 69 / 3.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 transformer.
 generator.
 thermocouple.
 choke.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 36°
 18°
 30°

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MORE MCQ ON Electrical Machines

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