Discussion
Assertion (A): A shunt generator will not build up if its field resistance is too high.
Reason (R): The field resistance line then lies above the magnetisation curve.
Select the correct option.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. The field resistance line is a straight line through the origin whose slope is the field circuit resistance, and build-up settles where that line meets the magnetisation curve. If the resistance is above critical the line is steeper than the initial part of the curve, lies above it everywhere, and the only intersection is at the origin - so the machine never leaves its residual voltage.
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