11.Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.

12.Armature reaction in a generator results in

13.Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?

14.Lap winding is composed of

15.In a D.C. generator in case the resistance of the field winding is increased, then output voltage will