Assuming the use of low sulfur content...

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Question 1 of 2066636eef28f7522a1c51f729

Assuming the use of low sulfur content diesel fuel, what combination of conditions associated with uninspected fishing industry vessel engine room operations would most contribute to internal corrosion of exhaust systems?

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Question 1 of 20

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🔍 Key Concepts

• Condensation in exhaust systems when metal and gas temperatures are relatively cool • How engine load affects exhaust gas temperature and moisture remaining in the system • The role of ambient (engine room) temperature in allowing water vapor to condense inside exhaust piping

💭 Think About

• Under what temperature conditions is water vapor in exhaust most likely to condense on metal surfaces instead of staying as vapor and exiting the system? • How does running an engine at low load vs. high load change exhaust temperature and the likelihood of moisture and acidic compounds staying on the metal? • Which combination of ambient temperature and engine load will keep the exhaust system surfaces coolest relative to the moist exhaust gas, encouraging internal corrosion?

✅ Before You Answer

• Identify which choice gives the coolest overall exhaust system metal temperatures (consider both ambient and engine load). • Consider which condition would allow water vapor and acidic byproducts to sit on metal surfaces rather than being burned off or carried away. • Eliminate any option where both factors tend to raise temperatures and keep the system dry.

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