【Question 125】Boiler Foundation Questions (July 5)

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This post was last edited by zgj2405 on 2010-7-5 17:10. Please hide your replies; think carefully before posting, as edits are invalid! Those with different views on the provided answer keys can post discussions the next day. For multiple accounts under the same IP responding to participate, only the first response is valid. All participants receive 2 points as a reward. This round consists of multiple-choice questions, with 2 points for each question; an additional 5 points are given for getting all answers correct. Scores are given to the top 30 answerers. 1. Among all types of scale in boilers, the most harmful one is ( ). A. Carbonate scale　　　　　　　B. Sulfate scale C. Nitrate scale　　　　　　　D. Oil scale 2. After cleaning the boiler, it is particularly important to check those areas where cracks and severe corrosion are likely to occur, which is ( ). A. The bent edges and corners of the front and rear end caps of the furnace shell B. The steam drum area C. The middle part of the flue tube supports D. The furnace shell area. 3. Which methods can be used to detect cracks in a boiler? A. Kerosene powder method　　　　　　　B. Ultrasonic detection method C. Soft metal casting method　　　　　　D. A+B 4. If the boiler is not in use for a long period, but no more than one month, then ( ). A. Maintain steam during the ceasefire period B. Shut down the boiler and keep water with appropriate alkalinity at a high temperature C. Use the full-water maintenance method D. Use the dry-maintenance method 5. Ash accumulation on the boiler’s heating surfaces does not include ( ). A. Vanadium and sodium compounds B. Calcium sulfate C. Unburned carbon particles D. Iron oxides