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In an OCC at If =0, graph starts from origin.

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in DC Machines by (506k points)
In an OCC at If =0, graph starts from origin.

(a) True

(b) False

I have been asked this question during an online interview.

The origin of the question is No Load with On Load Characteristics of DC Generator in division DC Generator of DC Machines

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The correct choice is (b) False

The best explanation: As the machine would have been previously subjected to magnetization, a small residual voltage would be present with field unexcited. As will be seen practically, this is necessary for generator to self-excite. So, graph will start from just above the origin on Voc axis.

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