Question 173Steam Plants - Assistant Engineer

The correct answer is D) poor heat transfer in feed water heaters. An abnormally high temperature at the superheater outlet of a single furnace boiler would indicate poor heat transfer in the feed water heaters. This is because the feed water heaters are responsible for transferring heat from the steam or exhaust gases to the feed water, increasing the temperature of the feed water before it enters the boiler. If the heat transfer in the feed water heaters is poor, less heat will be absorbed by the feed water, leading to a higher temperature at the superheater outlet. The other options are incorrect because they do not directly explain the abnormally high temperature at the superheater outlet. High steam demand (A), insufficient combustion air (B), and excessive steam supply to fuel oil heaters (C) would not necessarily cause this specific issue.