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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V²
 f²
 V
 f

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 150Hz.
 100Hz.
 200Hz.

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Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  Z.
  P.
  none of these.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
 copper loss at half load.
 copper loss at over load.
  copper loss at any load.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 half.
 double.
 4 times.
 one fourth.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Armature control.
 Ward-Leonard control.
 Multiple voltage control.
 Field control.

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MORE MCQ ON Electrical Machines

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