An exhaust gas bypass is installed on a waste heat boiler in order to __________.

Correct Answer: Option B — minimize moisture condensation in the boiler gas passages at low loads

Exhaust gas bypass dampers on waste heat recovery boilers divert exhaust gases around the heating surfaces during low engine loads. This prevents low flue gas temperatures from dropping below the dew point, minimizing destructive sulfuric acid moisture condensation and corrosion.