For determining IaRa maximum _____________(a) Distance between Rf line and v+ IaRa line is taken(b) Distance between OCC and v+ IaRa line is taken(c) Maximum Distance between OCC and v+ IaRa line is taken(d) Can’t calculated graphicallyThis question was addressed to me during a job interview.The above asked question is from Graphical Representation of External Characteristics topic in section DC Generator of DC Machines

For determining IaRa maximum _____________(a) Distance between Rf line

1.	For determining IaRa maximum _____________(a) Distance between Rf line and v+ IaRa line is taken(b) Distance between OCC and v+ IaRa line is taken(c) Maximum Distance between OCC and v+ IaRa line is taken(d) Can’t calculated graphicallyThis question was addressed to me during a job interview.The above asked question is from Graphical Representation of External Characteristics topic in section DC Generator of DC Machines
Answer» The CORRECT choice is (c) Maximum Distance between OCC and v+ IaRa line is taken The best I can EXPLAIN: OCC when starts from some RESIDUAL voltage on y axis, goes on increasing TILL some maximum value and then starts reducing slightly. The BULK is formed where maximum distance between OCC and v+ IaRa line is taken, to get effective frop in armature.

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