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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 flat-topped
 rectangular
 co- sinusoidal

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Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
 high viscosity.
  low viscosity.
 low resistivity.

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 19%
 40%
 5%

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Will results in open circuit.
  Nothing will happen.
  Fail to start.
  Will results in short circuit.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K×R1
 R1 /K
 K²R1
 R1 /K²

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

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

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MORE MCQ ON Electrical Machines

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