3. Sketch the load characteristic of a d.c. generator with (i) shunt (ii) series excitation. Give reasons for the particular shape in each case. The O.C.C. at 700 r.p.m. of a series generator with...

Extracted text: 3. Sketch the load characteristic of a d.c. generator with (i) shunt (ii) series excitation. Give reasons for the particular shape in each case. The O.C.C. at 700 r.p.m. of a series generator with separately-excited field is as follows : Field current (A) 20 40 50 60 75 Armature e.m.f. (V) : 190 360 410 450 480 Determine the current and terminal voltage as a self-excited series machine when running at 600 r.p.m. with a load of 6 2 connected to the terminal. Resistance of armature and series winding is 0.32. Ignore effect [369 V; 61.5 A] of armature reaction.