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Electrical Machines

Electrical Machines
DC machine windings are

None of these
 short pitched
 full pitched
 either of these

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

  hysteresis loss.
 eddy current loss.
 both eddy current and hysteresis loss.
 ohmic loss.

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Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  lifts and hoists.
  jaw crushers.
  blowers.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.9 lag
 0.2 lag
 0.2 lead

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 2, 3, 6
 1, 2, 5
 2, 4, 5, 6
 3, 4, 5

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 200V
 20V
 100V
 10V

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