Basic Knowledge of Boilers: [Question of the Day] 2011.04.23
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This post was last edited by zgj2405 on 2011-4-24 08:50. 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; this round consists of multiple-choice questions, with 5 points awarded for each correct answer. In principle, scores are given to the top 50 respondents who answer within 24 hours. Please hide your replies; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Boiler tests mainly include measurements of boiler efficiency, fan output, air leakage, wind speed, and coal powder fineness. The instrument used to measure fan output and wind speed is called a pitot tube. The measurement principle behind the pitot tube is the practical application of Bernoulli’s equation; it determines results by measuring the ( ) of the medium and then performing calculations. A. Temperature B. Dynamic pressure C. Flow velocity D. Static pressure Answer: B
Reply 1# zgj2405 D. Static pressure
Choose C. In research, production, teaching, environmental protection, as well as in areas related to clean rooms, mine ventilation, and energy management, anemometers are commonly used to measure the wind speed in pipes and the airflow velocity in flues of furnaces; by making conversions, it is possible to determine the flow rate, and these devices can also be used to measure the water flow velocity in pipes. Using a pitot tube to measure velocity and determine flow rate is based on solid theoretical principles; it is easy to use, accurate, and represents a classic and widely applied measurement method. Furthermore, it can also be used to measure the pressure of fluids.
Reply 1# zgj2405 b