Discussion
Match the machine with its external characteristic.
1. Shunt 2. Series 3. Over-compounded
P. Rising with load Q. Slightly falling with load R. Steeply rising then falling
Answer: D
Correct answer: 1-Q, 2-R, 3-P
A shunt generator’s voltage falls slightly with load, through the armature drop, armature reaction and the consequent weakening of its own field. A series generator has no voltage at all at no load and rises steeply as current magnetises the field, until saturation and the resistance drop turn the curve over again. An over-compounded machine has enough series turns to make the full-load voltage exceed the no-load value, so its characteristic rises.
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