The vessel to which you are assigned has...

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Question 1 of 2066636eef28f7522a1c520248

The vessel to which you are assigned has main diesel engines fitted with intake and exhaust systems as shown in the illustration. Under what circumstances would the check valve open and bypass the rotary-lobe roots blower? Illustration MO-0179

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Question 1 of 20

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🔍 Key Concepts

• Note how the turbocharger compressor discharge joins the air line going to the charge air cooler and then to the scavenging ports. • Think about when the turbocharger can supply more air (and higher pressure) than the Roots blower, and what that would do to the pressure on each side of the check valve. • Focus on whether the engine is at light load vs. heavy load, and what that means for exhaust energy driving the turbine and therefore compressor pressure.

💭 Think About

• Look at the flow arrows: when the turbocharger is really working, what happens to the air pressure in the big duct on the right compared with the air leaving the Roots blower? • Under which condition would it be more efficient to let air go around the Roots blower instead of being forced through it? • Ask yourself: does the check valve open when the pressure on the bypass line is higher or lower than the pressure at the Roots blower discharge? Then match that to light vs. heavy load.

✅ Before You Answer

• Be clear on which side of the check valve is connected to turbocharger compressor discharge and which side is connected to the Roots blower side of the system. • Decide under which engine condition (light or heavy load) the turbocharger will produce the highest boost pressure. • Match that condition to whether the Roots blower discharge pressure would effectively be overcome (pressure pushing backwards / made unnecessary) or whether it would be needed to supplement the air supply.

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