The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and __________.

Correct Answer: Option C — allow for an increase in water volume as the engine warms up

In USCG Motor Plants (Diesel Engineering), regarding 'The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and', the correct operational principle is: 'allow for an increase in water volume as the engine warms up'.