Question 59Motor Plants - QMED

The correct answer is C) direct air admissions. Large, direct reversing, main propulsion diesel engines in maritime applications are typically started using direct air admissions. This method involves using compressed air that is directly admitted into the engine cylinders to rotate the crankshaft and start the engine. This is a common and reliable starting system for these types of large marine diesel engines. The other options are incorrect because hydraulic starting motors (A) and electric starting motors (B) are not the primary starting systems used for large, direct reversing, main propulsion diesel engines. Vane-type air motors (D) are a different type of air-powered starting system that is less commonly used for these large diesel engines.