Which of the following statements regarding IC engine pistons, rings, and cylinder liners is/are correct?
Options:
(A) Compression rings seal high-pressure combustion gas against blow-by into the crankcase.
(B) Oil control rings scrape excess lubricant off the cylinder bore on downstrokes and return it to the oil sump.
(C) Wet cylinder liners make direct contact with circulating liquid engine coolant in the block jacket.
(D) Dry cylinder liners are thin pressed sleeves that do not make direct contact with engine coolant.
Answer Key:
A, B, C, D
Step-by-Step Solution & Explanation
All four statements describe standard engine cylinder architecture:
• Compression rings seal combustion pressure.
• Oil scraper rings regulate cylinder oil film thickness.
• Wet liners contact coolant directly and require O-ring sealing collars.
• Dry liners are thin sleeves fitted into bored engine block castings without direct coolant contact.