Question 355Steam Plants - Assistant Engineer
70% to passWhy are hard scale deposits on the inside of boiler tubes most objectionable?
APoor heat transfer due to hard scale deposits overheats tubes.
BFlow of water within the tube is restricted.
CHydroxyl ions liberated by the scaling process form acid in the boiler water.
DThe metal of the tube interior is eaten away by scale.
AI Explanation
The correct answer is A) Poor heat transfer due to hard scale deposits overheats tubes. Hard scale deposits on the inside of boiler tubes restrict the efficient transfer of heat from the boiler's heat source to the water within the tubes. This reduced heat transfer can cause the metal of the tubes to overheat, potentially leading to tube failure and boiler damage. The other answer choices, while related to boiler operations, do not directly address the primary issue of poor heat transfer caused by hard scale deposits.
Related Questions
Q91:When raising steam on a cold boiler under normal conditions, you should always _... Q444:A boiler accumulation test is used to measure the _______________. Q170:Air accumulated in the inter condenser of the air ejector assembly is discharged... Q559:As steam accomplishes work in an engine or turbine, the pressure of the steam is... Q156:Which characteristic of fuel oil is the most significant when determining the te...
Ready to test your knowledge?
Take a Steam Plants - Assistant Engineer Practice ExamOfficial Resources