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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 200 V
 460 V
 115 V

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction by slowly.
 it will run in same direction.
 motor will not run.
 it will run in opposite direction.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and low voltage
 high current and high voltage
 low current and low voltage
 low current and high voltage

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
  2 Hz.
 10 Hz.
  3 Hz.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Parallel.
 None of the options.
  Series.
 Compound.

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Electrical Machines
Breather is provided in a transformer to

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

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