Question 153Motor Plants - 1st Asst/Chief

The correct answer is D) provide scavenge air pressure at low load. The diesel engine shown in the illustration is equipped with an auxiliary blower, which is used to provide scavenge air pressure at low load conditions. At low engine loads, the engine's turbocharger may not be able to generate sufficient scavenge air pressure on its own. The auxiliary blower supplements the turbocharger's output to ensure adequate air supply to the engine under these conditions, maintaining proper combustion and engine performance. The other answer choices are incorrect because: A) maintaining positive crankcase pressure is not the purpose of the auxiliary blower, B) increasing scavenge air pressure at full load is the function of the turbocharger, not the auxiliary blower, and C) maintaining a vacuum on the crankcase is not the role of the auxiliary blower in this system.