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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Copper loss
 Eddy current loss
 Hysteresis loss
 Magnetic loss

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Electrical Machines
DC generator will not build up voltage

 any one of above.
  if it has lost residual magnetism.
 if field resistance is more than critical resistance.
 due to wrong direction of rotation.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 field winding
 commutator
 starters

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  zero.
  250 V.
  very small, say about 2 or 3 V.
 about 100 V.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 8 KW.
  2 KW.
 10 KW.
 0.

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Electrical Machines
The overall power factor of an on load transformer

 is always leading.
 is always unity.
  depends on the power factor of the load.
 is always lagging.

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MORE MCQ ON Electrical Machines

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