The device shown in the illustration is...

🔍 Key Concepts

• Identify the flow paths on both sides of the central shaft (hot side vs. air side). • Notice the turbine wheel on one end and a compressor/impeller wheel on the other, mounted on the same shaft. • Compare this to what devices are used for crankcase protection, cooling-water circulation, and starting air on large diesel engines.

💭 Think About

• On a large marine diesel, which common device has an exhaust-gas side and a clean-air side connected by one shaft? • Does any crankcase safety device, cooling-water pump, or starting-air component normally have two separate scroll-shaped housings and rotating wheels on a common shaft like this? • What is the purpose of using exhaust-gas energy in an engine system – where is that recovered energy usually applied?

✅ Before You Answer

• Verify which choice involves exhaust gas energy driving a turbine connected to a compressor. • Confirm that crankcase explosion relief devices are usually valves or doors on the crankcase, not large shafted rotating machines. • Confirm that cooling-water pumps and air-start systems do not normally have a hot exhaust side with gas passages shaped like those labeled A in the illustration.

The device shown in the illustration is commonly used to __________. Illustration MO-0080

utilize the flow of exhaust gases to supercharge the engine

protect the crankcase from overpressure in event of explosion

provide cooling water circulation through the engine

provide air starting pressure

🔍 Key Concepts

💭 Think About

✅ Before You Answer