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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  short circuit.
  open circuit.
  increase in speed.
  decrease in speed.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 synchronous motor.
  induction generator.
 induction motor.
 synchronous generator.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 equal to that of second transformer.
 none of these.
  more than that of second transformer.
 less than that of second transformer.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 back to back test
 load test
 OC and SC tests
None of these

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.25.
 Greater than 1.
 near to 1.
 0.5.

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Electrical Machines
Armature of DC machine is made of

 insulating material.
 non-ferrous material.
 silicon steel.
 conducting material.

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MORE MCQ ON Electrical Machines

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