【Question 107】Boiler Foundation Questions (April 19)

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This post was last edited by zgj2405 on 2010-4-19 20:27. 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, only the first response indicating participation 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. In principle, answers are graded within 48 hours. For the specific method of hiding, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2% 1. An air preheater uses the heat from the flue gases at the back of the boiler to heat the （） used in combustion. A、Feed water ； B. Air ； C. Fuel ； D. Fuel. 2. Pulverized coal takes the longest time ( ) during the combustion process. A. Preparation phase before ignition ； B. Combustion stage ； C. Burnout phase ； D. Ignition stage. 3. The management focus for the lifespan of a boiler is the boiler’s main structure, and components that need to be monitored include ( ). A. Drum, header, main steam pipeline ； B. Water wall, superheater, reheater ； C. Drum, superheater, reheater, water wall ； D. Water wall, superheater, reheater, economizer. 4. After the boiler is ignited, as the temperature of the working fluid rises, when the iron content in the water exceeds the specified value, it is necessary to carry out ( ). A. Enhance combustion ； B、Row ； C. Reduce combustion. D. Hot cleaning. 5. The measure to prevent powder leakage during the operation of the powder conveyor is ( ). A. Proper use of the baffle, and regular checking of the powder level ； B. Strengthen inspection of electrical equipment ； C. Frequent leaks ； D. The unit is operating at full load.