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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
None of these
 either GNA or MNA
 MNA

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce both eddy current and hysteresis loss.
 reduce eddy current loss only.
 reduce hysteresis loss only.
 increase the permeability.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat less than 230 V
 6 V
 230 V
 somewhat more than 230 V

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and field current
 no load voltage and armature current
 short circuit current and armature current
 short circuit current and field current

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Electrical Machines
Which of the following are variable losses?

 eddy current loss
 shunt field copper loss
 hysteresis loss
 armature copper loss

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Universal.
  Capacitor run.
  Repulsion.
  Split phase.

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