Electric Machines Mega Quiz 5

21. In D.C. generators, current to the external circuit from armature is given through

22. Brushes of D.C. machines are made of

23. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by

24. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be

D.C. generators are connected to the busbars or disconnected from them only under the floating condition