Diesel engine mufflers or silencers reduce...

Question 1 / 270705eccefa2bacbc34ba4d47b63

Question 1 of 270705eccefa2bacbc34ba4d47b63

Diesel engine mufflers or silencers reduce the engine exhaust noise by __________.

Question 1 of 27070

Diesel engine mufflers or silencers reduce the engine exhaust noise by __________.

🔍 Key Concepts

• How mufflers/silencers work in general (on any internal combustion engine) • Relationship between gas velocity, expansion, and sound energy • What happens to sound when a gas is allowed to expand and slow down in chambers or baffles

💭 Think About

• Think about whether faster-moving exhaust gas tends to be noisier or quieter when leaving a pipe into the open air. • Which option best describes what typical mufflers actually do inside: do they constrict flow to speed it up, or give the gas space/baffles to change pressure/velocity and absorb sound? • Eliminate any answers that suggest mechanisms that are uncommon or impractical in real marine exhaust systems.

✅ Before You Answer

• Check which choice matches the idea of expanding exhaust gases into larger volumes or chambers. • Verify which option would most likely lower sound pressure levels at the outlet. • Make sure the option you pick is consistent with how car and truck mufflers work, since the basic principle is the same.

Question 1 of 27070

Diesel engine mufflers or silencers reduce the engine exhaust noise by __________.

passing the exhaust through long head pipes

diffusing exhaust vibrations through activated carbon baffles

increasing the exhaust gas velocity

reducing the exhaust gas velocity

Question 1 / 270705eccefa2bacbc34ba4d47b63

Question 1 of 270705eccefa2bacbc34ba4d47b63

Diesel engine mufflers or silencers reduce the engine exhaust noise by __________.

Back

Question 1 of 27070

Diesel engine mufflers or silencers reduce the engine exhaust noise by __________.