Electrical Machines
Flashing the field of DC generator means

  making the magnetic losses forces parallel.
  neutralising residual magnetism.
  creating residual magnetism by a DC source.
 increasing flux density by adding extra turns of winding.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 A is bigger than B for the same voltage rating
 B is bigger than A for the same current rating
 A is bigger than B for the same current rating
 both are of the same size for the same current rating

ANSWER DOWNLOAD EXAMIANS APP