Operating a reciprocating air compressor without an air filter will cause __________.

Correct Answer: Option C — excessive wear on valves and cylinder liners

Air filters are critical for preventing atmospheric contaminants like dust and grit from entering the compressor. Without filtration, these abrasive particles enter the cylinders, causing rapid scoring of cylinder liners and accelerated wear on piston rings and valves, significantly reducing the service life and efficiency of the compressor unit.