Question 27General Subjects - Assistant Engineer

The correct answer is D) Ship's service air compressor. The ship's service air compressor is typically designed to operate at around 100 psig to provide compressed air for various ship systems and equipment. This pressure is sufficient for the operation of deck machinery, valves, and other pneumatic equipment on board the vessel. The other options are incorrect because: A) Starting air compressors typically operate at a higher pressure, around 200-300 psig, to provide the necessary air pressure for starting the ship's main engines. B) Topping air compressors are used to maintain the pressure in the starting air system and would also operate at a higher pressure. C) Emergency air compressors are designed to provide backup air supply at a similar pressure as the ship's service air compressor, around 100 psig.