Discussion
A dc motor's speed regulation is defined as
Answer: C
Correct answer: the no-load speed less the full-load speed, as a fraction of full load
Speed regulation is
\[ \text{regulation} = \frac{N_{nl} - N_{fl}}{N_{fl}} \times 100\% \]and it measures how much the speed droops as load is applied. A shunt motor manages a few per cent, a series motor a great deal more. It describes the machine’s inherent behaviour, not the range over which it can be controlled, which is a separate specification.
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