The piston rod scraper box incorporated in a two-stroke cycle, crosshead diesel engine serves to __________.

Correct Answer: Option C — prevent sludge and dirty oil from entering the crankcase

The piston rod scraper box contains spring-loaded scraper rings that remove combustion residues, carbon, and scraped cylinder oil from the reciprocating rod, preventing contaminants from entering and degrading the crankcase lubricating oil.