You are assigned as an engineer on an anchor...

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Question 1 of 2066636eef28f7522a1c51f6ec

You are assigned as an engineer on an anchor handling vessel using main propulsion engines of the type shown in the illustration. Fortunately, with engines of this type, it is possible to inspect the compression rings while in place inside the engine. What would be the indication of properly functioning rings? Illustration MO- 0224

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Question 1 of 20

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🔍 Key Concepts

• Function of compression rings in a four-stroke diesel like the one shown in MO-0224 • Difference between normal wear patterns and signs of blow-by or sticking on piston rings • Why rings must be free to move in their grooves for proper sealing and lubrication

💭 Think About

• Look at how combustion gases move in the illustration and think about what a good gas seal at the cylinder wall would make the ring face look like over time • Ask yourself which surface appearance would suggest correct contact with the cylinder liner versus oil glazing or carbon fouling • Consider why a ring that cannot move freely in its groove would affect compression and oil control

✅ Before You Answer

• Confirm that properly working compression rings should be free to move slightly in their grooves and not be stuck • Decide which surface condition best indicates even contact with the liner without heavy carbon deposits • Eliminate any option that suggests stuck rings or faces that are heavily carboned or completely shiny/glazed with oil

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