Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Reluctance motors.
  Universal motors.
  Induction motors.
  Stepper motors.

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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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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field resistance was higher than critical resistance
 there was a break in the armature circuit
 field winding was wrongly connected
 field system lost residual magnetism

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