Question 165Motor Plants - QMED

The correct answer is B) sulfuric acid corrosion. When diesel engine exhaust gases are cooled below their dew point, the water vapor in the exhaust condenses. This condensate can then dissolve any sulfur compounds in the exhaust, forming sulfuric acid. The presence of this sulfuric acid can lead to corrosion in the exhaust system, which is the key reason why this is the correct answer. The other options are incorrect because: A) increased back pressure is not a direct result of cooling the exhaust below the dew point, C) surface pitting of the turbocharger is not a typical effect of this phenomenon, and D) moisture impingement on the turbocharger blades is not the primary concern compared to the sulfuric acid corrosion.