Which component reduces the noise of ambient air?

• A. Air Cleaner
• B. Air Silencer
• C. Aftercooler
• D. Intercooler

Answer: (B)

Noise control in an air intake system is achieved by devices that absorb or dampen the sound waves produced as air moves through ducts and components. An air silencer is specifically designed to cut these noise levels by guiding the air through passages, baffles, and porous materials that absorb sound energy and disrupt turbulent flow that creates noise. As air flows and pressure waves develop, the silencer converts much of the acoustic energy into a small amount of heat, resulting in quieter operation near the ambient environment. The air cleaner removes dust and particulates, which is not about sound. An aftercooler and an intercooler focus on cooling the air after compression to improve density and reduce moisture, rather than reducing noise, so they don’t serve as the primary means of muffling sound.