Electrical Machines
In DC generator, lap winding is used in

  high current and low voltage applications.
 high voltage and low current applications.
 where constant speed is required.
 where greater load is connected.

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 Ph will decrease but Pe will remain same
 both hysteresis loss(Ph) and eddy current loss(Pe) will increase
 Ph will increase but Pe will decrease
 Pe will increase but Ph will decrease

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