【Question 120】Boiler Basic Questions (June 22)

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This post was last edited by zgj2405 on 2010-6-22 at 13:15. 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. The higher the boiler steam pressure, the more intense the natural water circulation ( ). A. The better　　　　　　　　　　B. The worse C. Unaffected　　　　　　　　D. Varies from good to bad 2. When a boiler uses natural ventilation, the furnace pressure is ( ) atmospheric pressure. A. Higher than　　　B. Lower than　　　C. Equal to　　　D. A or B 3. If the excess air coefficient of a boiler is too high, then ( ) increases. A. Fan energy consumption　　　　　　　B. Smoke exhaust losses C. Incomplete combustion losses　　　　　D. A+B 4. The greatest hazard of oil in boiler water is that it causes ( ). A. Reduced evaporation rate　　　　　　　B. Damage to the heating surface tubes C. Increased amount of water carried by the steam D. Increased corrosion 5. The function of the orifice plate located below the water level in the boiler’s drum is ( ). A. Preventing foaming of water B. Improving water circulation C. Balancing the evaporative surface load D. A+B+C