A main propulsion diesel engine on your...

Question 1 / 2066636eef28f7522a1c51fe98

Question 1 of 2066636eef28f7522a1c51fe98

A main propulsion diesel engine on your towing vessel produces gray to black smoke under virtually all load conditions as observed at the stack. The heavier the load on the engine, the darker the smoke becomes. What condition would most likely account for this?

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🔍 Key Concepts

• Relationship between diesel exhaust color and type of problem (fuel, air, oil, or water/steam) • How engine load and back pressure affect combustion and smoke color/intensity • Typical symptoms of oil burning vs water/steam in exhaust vs restricted exhaust flow

💭 Think About

• For each choice, ask: would this problem usually make the exhaust look black/sooty, blue, or white? Which matches the question? • How would the smoke change as engine load increases for each condition—would it reliably get darker with more load? • Which condition directly affects how easily exhaust can leave the engine, and how would that influence combustion efficiency and smoke?

✅ Before You Answer

• Match smoke color (gray to black, heavier with load) with the most typical cause in diesel engines: fuel-rich/incomplete combustion vs oil burning vs water/steam. • Check which options would mainly introduce oil into the exhaust, which would introduce water, and which would change exhaust flow or pressure. • Eliminate any option that would more likely cause white steam or blue/oily smoke rather than sooty black smoke.

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Question 1 of 20

Excessively worn exhaust valve guides.

Leaking exhaust piping expansion joints.

Excessively restricted exhaust silencer/muffler.

Leaking exhaust manifold cooling water jackets.

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Question 1 / 2066636eef28f7522a1c51fe98

Question 1 of 2066636eef28f7522a1c51fe98

Back

Question 1 of 20

66636eef28f7522a1c51fe98

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Be the first to share your thoughts!

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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