Question 228Steam Plants - Assistant Engineer
70% to passWhich of the following problems can occur when an excessive number of water screen tubes are plugged?
ASuperheater outlet temperature will rise.
BSteam pressure leaving the drum will increase.
CSuperheater outlet pressure will rise.
DSteam temperature in the drum will decrease.
AI Explanation
The correct answer is A) Superheater outlet temperature will rise. When an excessive number of water screen tubes are plugged, it reduces the flow of water through the boiler. This leads to less heat transfer from the furnace gases to the water, causing the superheater outlet temperature to rise. The other options are incorrect because a reduction in water flow would not cause the steam pressure leaving the drum to increase (B), the superheater outlet pressure to rise (C), or the steam temperature in the drum to decrease (D).
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