Electrical Machines
The basic function of a transformer is to change

 the power factor
 the level of the voltage
 the frequency
 the power level

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

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

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