【Question 005】Boiler basic questions

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This post was last edited by zgj2405 on 2009-10-31 23:43. 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. For the multiple-choice questions in this session, each question is worth 2 points, with an additional 5 points awarded for getting all of them correct. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D1. 1. When the position of the flame center drops, inside the furnace ( ). a. The heat absorbed by radiation decreases, and the temperature of the reheat steam rises. b. The heat absorbed by radiation increases, and the temperature of the reheat steam drops. c. The heat absorbed by radiation decreases, and the temperature of the reheat steam drops. 2. The purpose of performing passivation treatment after acid cleaning of the heating surfaces is ( ). A. Forming a dense layer of magnetic iron oxide as a protective film on the metal surface. B. Making the metal surface smoother. C. Creating an anti-wear protective layer on the metal surface. D. Removing residual iron shavings from the metal surface. 3. The main reason for the gradual increase in vibration of the induced draft fan as operating hours increase is generally ( ). A. Bearing wear B. Abnormal air intake C. Abnormal air output D. Fan impeller wear 4. With the external load remaining constant, the stability of steam pressure mainly depends on ( ). A. The value of the heat intensity per unit volume of the furnace chamber; B. The stability of the combustion conditions inside the furnace; C. The heat storage capacity of the boiler; D. The magnitude of the heat load on the water wall after it is heated. 5. Increasing the soot blowing on the water wall will result in an increase in the temperature of the superheated steam ( ). A. Decrease B. Increase C. Remain unchanged D. Increase in a logarithmic manner