11.In a D.C. generator the critical resistance can be increased by

12.The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is

13.The main factor which leads to unstable parallel operation of flat and over compounded generators is

14.With a D.C. generator which of the following regulation is preferred ?

15.For both lap and wave windings, there are as many commutator bars as the number of