Question 318Motor Plants - Assistant Engineer

The correct answer is D) increase peak power output. Cooling the intake air supplied to a diesel engine increases the air charge density, which in turn increases the mass of air drawn into the engine cylinder. This higher air charge density results in a greater amount of fuel being able to be burned during the combustion process, leading to an increase in the peak power output of the engine. The other answer choices are incorrect because: A) Reducing mean effective pressure would decrease engine power output, not increase it. B) Decreasing the average compression ratio would decrease engine power output, not increase it. C) Decreasing air charge density would reduce the mass of air drawn into the engine, leading to lower power output.