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Electrical Machines

Electrical Machines
In DC machines shape of net flux density is?

 flat tapped or trapezoidal
 saddle shape
 peaky in nature
 sine wave

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  self or mutual induction.
  self induction.
  electromagnetic induction.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 field winding
 interpole winding
 armature winding
 interpole and compensating windings together

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Electrical Machines
Which of the following are variable losses?

 eddy current loss
 armature copper loss
 hysteresis loss
 shunt field copper loss

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 infinity.
 two.
 zero.
  unity.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
 will become lagging
 will remain the same
None of these

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