Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
 copper loss at half load.
  copper loss at any load.
 copper loss at over load.

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Electrical Machines
The compensating winding in a DC machine

 is located on commutating poles for improving commutation.
  is located on pole shoes to avoid the sparking at the brushes.
  is located on pole shoes for avoiding the flashover at the commutator.
 is located in armature slots for compensation of the armature reaction.

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

  reduction in field current, effect of armature reaction, armature.
 armature resistance, effect of armature reaction.
 armature resistance, inter poles, armature.
  armature resistance, effect of armature reaction.

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