The four-stroke cycle, turbocharged main...

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Question 1 of 2066636eef28f7522a1c51fbcc

The four-stroke cycle, turbocharged main propulsion engines on your fishing vessel are fitted with after coolers for the purposes of increasing the air charge density and total power output. The after cooler air ducts must be periodically drained to remove accumulated condensation. What combination of conditions dictate more frequent draining?

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Question 1 of 20

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🔍 Key Concepts

• Turbocharging and aftercooling – how cooling compressed air affects its density and moisture content • Condensation formation – relationship between air temperature, cooling, and water vapor condensing in ducts • Engine load and air flow – how higher load changes turbo boost pressure, air temperature, and moisture volume

💭 Think About

• Think about when the air going into the after cooler will drop the most in temperature relative to the outside (ambient) air – when is that temperature drop largest? • Consider which combination will produce the greatest amount of water vapor being carried into the cooler and then condensed out: does high load mean more or less air and moisture moving through? • Ask yourself: in which situation is it most likely that cool metal surfaces and moist air will cause more water to condense and collect in the ducts?

✅ Before You Answer

• Compare low vs high ambient temperature: which one leads to a bigger cooling effect across the after cooler and thus more condensation? • Compare high vs low engine load: which one produces higher turbocharger boost, hotter compressed air, and more total moisture to be condensed? • Before choosing, mentally rank each option in terms of expected amount of condensation (from most to least), then select the one you believe gives the maximum condensation.

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