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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 dependent upon the load.
 0o.
 180o.
 90o.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use drum winding.
 reactance voltage produced due to communication.
  the use equalizer in lap winding.
 the use of compensating winding.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 V
 f²
 V²

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Reduced copper loss.
  Decrease in weight/KVA.
 Increase in weight/KVA.
 Reduced iron loss.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of turbo alternator.
  none of these.
 greater than that of hydro generator.
 equal to that of the effective length of the line.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Both Compensating and Commutating pole winding.
 Compensating winding.
 Commutating pole winding.
 Auxiliary winding.

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