Coast Guard Exams
Question 105Motor Plants - Assistant Engineer70% to pass

Item labeled 'R' as shown in section 6 of the illustration is identified as the_______________. Illustration MO-0025

Diagram for question 105
AI Explanation
The correct answer is D) aftercooler. The item labeled 'R' in the illustration MO-0025 is identified as the aftercooler. The aftercooler is a heat exchanger that cools the compressed air from the turbocharger before it enters the engine's intake manifold. This cooling process increases the density of the air, allowing the engine to produce more power. The other answer choices, such as the air filter, exhaust manifold, and non-return scavenge valve, are not the components labeled 'R' in the given illustration.