Question 139Motor Plants - QMED

The correct answer is C) air charge density decreases. When the cooling water flow through the aftercooler is interrupted, the air charge density decreases. The aftercooler is used to cool the compressed air from the turbocharger before it enters the engine. If the cooling water flow is interrupted, the air charge will not be adequately cooled, resulting in a lower air density. This lower air density leads to a decrease in the power output of the turbocharged diesel engine. The other options are incorrect because: A) the turbocharger does not stall, B) the exhaust pressure does not increase, and D) the scavenge effect does not increase when the aftercooler cooling water flow is interrupted.