Question 196General Subjects - Assistant Engineer

The correct answer is D) variable or constant speed motor. The device illustrated appears to be a hydraulic motor, which can be used as either a variable or constant speed motor to power various onboard systems on a vessel. This type of motor is commonly used in marine applications to provide mechanical power for tasks such as operating hatches, winches, or other equipment. The other answer choices are not as accurate. A power take-off driven lube oil pump (A) and a variable capacity pump (B) are different types of hydraulic components, not motors. A hydraulic hatch supply pump (C) is a more specific application of a hydraulic motor, but the general description of "variable or constant speed motor" is a more accurate characterization of the device shown.