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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
 conduction.
 radiation.
  convection.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Magnetization
 Demagnetization
None of these
 Cross magnetization

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to provide better flux linkage.
  to reduce mechanical losses.
  to reduce eddy current loss.
  to reduce hysteresis loss.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 0°.
 about 115°.
  about 75°.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 230 V
 460 V
 115 V

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Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
None of these
 non reversing drive
 reversing drive

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