Question 10Motor Plants - Assistant Engineer

The correct answer is B) propeller curve. The propeller curve, also known as the propeller characteristic curve, is a graphical representation of the relationship between the thrust and speed of a marine propeller. This curve shows the performance of the propeller and is an essential tool for understanding the propulsion system of a vessel. The propeller curve is typically labeled as "Line P" in marine engineering illustrations, such as the one referenced (MO-0126). The other options are incorrect because they do not accurately describe the purpose or meaning of Line P in the illustration. Line "A" would represent the line of maximum horsepower, Line "C" would represent the line of maximum efficiency, and Line "D" would represent an exponential line, which is not the typical representation of a propeller curve.