For self-excited DC generator, field circuit curve in the OCC will be __________(a) Straight line not passing through the origin with +ve slope(b) Straight line passing through the origin(c) Straight line not passing through the origin with -ve slope(d) Increasing curveI had been asked this question in an online interview.Asked question is from Characteristics of Self Excited Generator in chapter DC Generator of DC Machines

For self-excited DC generator, field circuit curve in the OCC will be

1.	For self-excited DC generator, field circuit curve in the OCC will be __________(a) Straight line not passing through the origin with +ve slope(b) Straight line passing through the origin(c) Straight line not passing through the origin with -ve slope(d) Increasing curveI had been asked this question in an online interview.Asked question is from Characteristics of Self Excited Generator in chapter DC Generator of DC Machines
Answer» The CORRECT choice is (b) Straight line PASSING through the origin The best I can explain: Field is CONNECTED such that this current increases the field MMF and therefore the induced EMF, the machine will continuously build up. For the field circuit V = If *Rf, which is a straight-line relationship, called the Rf -line, in V-If plot.

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