Engine General (Supplementary) USCG Question #440 (Set 8)

The device shown in the illustration is commonly used to __________? GS-0120

USCG Exam Illustration GS-0120
USCG Examination Diagram: Illustration GS-0120
Official USCG Answer & Rule Citation

Correct Answer: Option C — compress air

The illustration depicts a reciprocating piston-type air compressor, characterized by cylinders, pistons, and valve assemblies. These machines are standard equipment on vessels for providing compressed air for starting main engines, operating pneumatic tools, and supplying control systems. Their mechanical design is specifically engineered to increase the pressure of an air charge.

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