A Roots-blown, two-stroke cycle main...

Question 1 / 2066636eef28f7522a1c5201f0

Question 1 of 2066636eef28f7522a1c5201f0

A Roots-blown, two-stroke cycle main propulsion engine on the fishing factory ship to which you are assigned is emitting excessive bluish-tinged smoke from the stack. Further investigation reveals excessive lube oil consumption. What condition would most likely account for this?

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🔍 Key Concepts

• Color of exhaust smoke and what it indicates (blue vs black vs white) • How lube oil can get into the scavenging air or combustion space on a two-stroke engine • The function and location of a Roots blower and its seals, air intake, and effect on mixture

💭 Think About

• Think about which component, if it fails, would allow lubricating oil to be carried along with the intake or scavenging air into the cylinders • Consider which fault would mainly affect air quantity (and thus black smoke or poor combustion) rather than directly introducing oil • Ask yourself: which option connects directly to oil getting into the air stream or cylinders, not just fuel or air supply?

✅ Before You Answer

• Link blue smoke specifically to burning lubricating oil, not fuel • Identify which listed fault is most directly associated with oil leakage into the air path on a Roots-blown two-stroke • Eliminate choices that would more likely cause black smoke (rich fuel/poor air) or white smoke (unburned fuel/cool combustion) rather than blue

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Question 1 of 20

Worn blower rotor shaft seals

Leaking fuel injector needle valve

Restricted scavenging air intake ports

Restricted blower air intake filter

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Question 1 / 2066636eef28f7522a1c5201f0

Question 1 of 2066636eef28f7522a1c5201f0

Back

Question 1 of 20

66636eef28f7522a1c5201f0

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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