Question 402Motor Plants - Assistant Engineer

The correct answer is D) maintain a constant speed with variations of load. The key characteristic of an isochronous governor is its ability to maintain a constant engine speed regardless of changes in the load. An isochronous governor accomplishes this by automatically adjusting the engine's fuel supply to compensate for load variations, keeping the speed constant. This is in contrast to other governor types, such as the droop governor, which allow the engine speed to decrease as the load increases. The other answer choices are incorrect because they do not accurately describe the behavior of an isochronous governor. Option A describes the behavior of a speed-droop governor, option B describes an overspeed shutdown mechanism, and option C describes the behavior of a speed-droop governor, which is the opposite of an isochronous governor.