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Electrical Machines

Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  modified.
  none of these.
  reversed.

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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
Under commutation results in

  no sparking.
  sparking at the leading edge of the brush.
  sparking the trailing edge of the brush.
  sparking at the middle of the brush.

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

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

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

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Electrical Machines
Which of the following generators are used in arc welding?

 shunt generators
 differential compound generators
 series generators
 cumulative compound generators

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