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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

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

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Electrical Machines
In DC generator, lap winding is used in

  high current and low voltage applications.
 high voltage and low current applications.
 where constant speed is required.
 where greater load is connected.

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Electrical Machines
Series booster is a

  series wound DC generator.
 separately excited DC generator.
 permanent magnet DC generator.
 shunt wound DC generator.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the mass.
 to reduce the hysteresis loss.
 to reduce the eddy current loss.
 to reduce the inductor.

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Avoid sparking.
 Limit the flux.
  Limit the speed.
 Limit the current.

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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

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

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