Question 27 DDE04 - Designated Duty Engineer - 1000-4000 HP

The Correct Answer is C **Explanation for Option C (Charge air manifold):** The Charge Air Manifold (also known as the intake manifold or plenum) is the component responsible for collecting the high-pressure, cooled air delivered by the turbocharger/charge air cooler system and distributing it evenly to the intake ports of the individual cylinders. Since the illustration refers to a diesel generator with intake and exhaust systems, and component "2" is positioned after the cooling stage (usually labeled as a charge air cooler, D), its function must be to deliver the boosted air to the engine cylinders. Therefore, component "2" represents the Charge Air Manifold. **Why the other options are incorrect:** * **A) Wet muffler:** A muffler is part of the **exhaust system** and is used to dampen engine noise. Component "2" is positioned within the intake (air) system flow, making this incorrect. * **B) Exhaust manifold:** The Exhaust Manifold collects spent gases **after** combustion and directs them to the turbocharger turbine or directly out of the engine. Component "2" is involved with the air entering the engine, making this incorrect. * **D) Charge air cooler:** The Charge Air Cooler (CAC) removes heat from the air compressed by the turbocharger, increasing the density of the air charge. While air passes through the CAC *before* the manifold, the manifold (C) is the distribution component itself. If "2" is the final distribution point just prior to the cylinder head, it is the manifold, not the cooler.