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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  decrease in speed.
  open circuit.
  increase in speed.
  short circuit.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 both 1 and 2
 Copper loss
 windage and friction loss
 core loss only

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Electrical Machines
In which of the following motors DC excitation is not required?

 3-phase synchronous generator
 3-phase synchronous motor
 hysteresis motor
 reluctance motor

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 reluctance motor.
 repulsion motor.
 AC series motor.

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Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  blowers.
  jaw crushers.
  lifts and hoists.

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Electrical Machines
In alternator, the rotary part is

 armature.
 core.
 none of these.
  magnetic field poles.

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