Question

No load point of DC generator is __________

(a) Intersection of OCC and Rf line

(b) Point on the Y axis at rated field current

(c) Point on the X axis at rated terminal voltage

(d) Can’t find through graphical interpretation

I have been asked this question in an international level competition.

This interesting question is from Graphical Representation of External Characteristics topic in section DC Generator of DC Machines

Answer 1

Correct option is (a) Intersection of OCC and Rf line

The explanation is: Intersection of OCC with field resistance line gives the no-load point. All the value so obtained from x and y axis respectively gives the terminal voltage and field current of a DC generator at no-load.