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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 greater than
 less than
 any of the above

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Electrical Machines
Armature reaction depends on which of the following?

 power factor of load
None of these
 both 1 and 2
 magnitude of load current

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Electrical Machines
The three point starter is used for

  Series motor.
  Shunt motor.
  Shunt, compound and series motor.
  Shunt motor as well as compound motors.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction motor torque.
  synchronous motor torque.
  DC motor torque.
  induction generator torque.

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Electrical Machines
Breather is provided in a transformer to

 filter the transformer oil.
  absorb moisture of air during breathing.
 absorb moisture from air entering in transformer.
 provide cold air in transformer.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  statically induced voltage.
  dynamically induced voltage.
  reactance voltage.
None of these

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