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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 leading.
 unity.
  lagging.
 zero.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1000W , 1400W
 1600W, 800W
 1400W, 1000W
 800W, 1600W

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

 series generator.
  short - shunt generator.
  level compound.
  shunt generator.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 20 V
 zero
 50 V
 40 V

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 trapezoidal.
 sinusoidal.
 rectangular.
  triangular.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 triangular
 saddle shape
 peaky in nature
 flat tapped or trapezoidal

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MORE MCQ ON Electrical Machines

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