Question 78Motor Plants - QMED

The correct answer is A) a possible overheated bearing. An oil mist detector in a main propulsion diesel engine is designed to warn of a possible overheated bearing. The oil mist detector monitors the engine crankcase for the presence of oil mist, which can be an indication of a bearing failure or other mechanical issue that is generating excess heat. This early warning system allows the engine operator to take corrective action before a more serious problem develops. The other answer choices are incorrect because they do not accurately describe the primary purpose of an oil mist detector. Options B, C, and D are related to other engine monitoring systems, but are not the main function of the oil mist detector.