Question 379Motor Plants - Assistant Engineer

The correct answer is A) provide scavenge air pressure at low load. The auxiliary blower in the diesel engine illustration is used to provide additional air pressure to the engine's scavenge air system, particularly at low engine loads. This helps ensure sufficient air flow through the engine cylinders, which is crucial for complete combustion and efficient operation, especially when the engine is not generating enough natural air flow on its own at low loads. The other answer choices are incorrect because: B) maintaining a positive pressure on the crankcase is not the primary function of the auxiliary blower, C) increasing scavenge air pressure at full load is not necessary as the engine's natural air flow is sufficient at high loads, and D) maintaining a vacuum on the crankcase is not the role of the auxiliary blower.