【Question 084】Boiler basic questions

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This post was last edited by zgj2405 on 2010-3-17 20:08. 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 considered 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. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2% 1. For boilers of different capacities, the larger the capacity, the greater the value of q5(). A. Smaller B. Unchanged C. Larger D. Irrelevant 2. The most widely used method for determining the thermal efficiency of boiler units is ( ). A. Forward balance method B. Reverse balance method C. Both methods are applicable D. It depends on the conditions of the boiler. 3. For the entire boiler unit, the optimal coal powder fineness refers to ( ). A. The fineness at which the power consumption of the coal grinder is minimized. B. The fineness at which the output of the coal grinding system is maximized. C. The fineness at which the net efficiency of the boiler is highest. D. The fineness at which the total specific energy consumption for coal grinding is minimized. 4. The main factors that do not affect the operation of a medium-speed coal grinder are ( ). A. Rotational speed, air volume; B. Air flow velocity in the air ring; C. Grinding pressure and fuel properties; D. Ball filling coefficient. 5. ( ) Grease is heat-resistant, but it is sensitive to water and moisture. A. Calcium lipide B. Sodium lipide C. Lithium lipide D. All