You are analyzing the data used for trend...

Question 1 / 2066636eef28f7522a1c51f6a2

Question 1 of 2066636eef28f7522a1c51f6a2

You are analyzing the data used for trend analysis for one of the 2-stroke turbocharged main propulsion diesel engines on your ocean-going tug. Over time the scavenging air receiver (air box) pressure is steadily increasing. What condition would produce this data?

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🔍 Key Concepts

• Scavenging air receiver (air box) pressure relationship to air flow restriction and port condition • Difference between restrictions before the turbocharger, after the turbocharger, and at the scavenging ports • How fouling on the air side of the system affects pressure and flow patterns over time

💭 Think About

• Think about what happens to the pressure in a closed volume if the same amount of air is being pushed in but it cannot get out as easily. • Compare which components, when fouled, would cause less air to reach the cylinders versus less air to reach the turbocharger. • Ask yourself: which restriction would cause the blower/turbo to build higher pressure in the receiver, rather than lower pressure?

✅ Before You Answer

• Identify which components are upstream of the turbocharger, which are between the turbo and air box, and which are between the air box and the cylinders. • For each option, predict whether the scavenging air receiver pressure would increase, decrease, or stay about the same over time. • Verify which condition would most likely cause increased receiver pressure but reduced effective scavenging of the cylinders.

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Question 1 of 20

The turbocharger air inlet screen is gradually becoming fouled.

The engine air intake filter is gradually becoming fouled.

The scavenging air ports are gradually becoming restricted with carbon.

The air side of the turbocharger after cooler is gradually becoming fouled.

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Question 1 / 2066636eef28f7522a1c51f6a2

Question 1 of 2066636eef28f7522a1c51f6a2

Back

Question 1 of 20

66636eef28f7522a1c51f6a2

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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