You are analyzing the data used for trend...

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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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Question 1 of 20

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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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