Question 41Motor Plants - QMED

The correct answer is D) minimize moisture condensation in the boiler gas passages at low loads. The purpose of an exhaust gas bypass on a waste heat boiler is to prevent moisture condensation in the boiler gas passages at low engine loads. At low loads, the exhaust gas temperature may drop below the dew point, leading to condensation. The exhaust gas bypass allows a portion of the hot exhaust gas to bypass the boiler, maintaining higher temperatures and preventing this condensation issue. The other options are incorrect because they do not accurately describe the primary purpose of the exhaust gas bypass on a waste heat boiler. Options A and B relate more to managing backpressure or efficiency, while option C describes a different system (exhaust gas recirculation) not specifically related to the waste heat boiler.