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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 mechanical loss
 copper loss
 both A and B

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Nothing will happen.
  Will results in short circuit.
  Fail to start.
  Will results in open circuit.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 440 A.
 400 A.
 44 A.
  40 A.

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Electrical Machines
In DC generator, lap winding is used in

 where greater load is connected.
 high voltage and low current applications.
 where constant speed is required.
  high current and low voltage applications.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very high speed.
 run at very low speed.
 burn.
 start haunting.

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  balance the rotor dynamically.
  eliminate noise.
  facilitate cooling of rotor.
  none of these.

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