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EASA Gas Turbine Engine Practice Test

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Which engine category is most likely to have a noise suppression unit installed?
Correct Answer:
Turbojet
Explanation:
Noise suppression units are used to cut the noise coming from the exhaust of jet engines. A turbojet relies entirely on a jet exhaust to produce thrust, with little to no bypass air to muffle the sound. That makes the exhaust the dominant noise source, so installing an exhaust noise suppression device is a common and effective way to meet strict noise limits. Other engine types have different dominant noise sources (propeller noise for turboprops, rotor and mechanical noise for turboshafts, or the bypass stream in turbofans reducing core jet noise), so they are less commonly equipped with a dedicated exhaust noise suppression unit. Therefore, the turbojet is the most likely to have one.

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