Basic Chemical Engineering Knowledge: One Question per Day: February 24, 2012

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This post was last edited by ai444099439 on 2012-2-24 23:23. Multiple-choice questions on fluid flow: 17. Steady flow refers to a situation in a fluid flow system where physical quantities related to the flow, such as the velocity, pressure, and density of the fluid at any given cross-section, ( ). A. Change only with position, not with time B. Change only with time, not with position C. Do not change neither with time nor with position. 18. When a fluid flows turbulently inside a pipe, the thickness of the laminar inner layer increases as the Reynolds number Re increases. A. Thicken B. Thin out C. Remain unchanged 19 In a steadily flowing parallel pipeline, the flow rate through the section of pipe that is longer, has a smaller diameter, and a higher friction coefficient is ( ). A. The same as the supervisor’s B. Large C. Small 20. The physical meaning of u2/2 is to indicate the kinetic energy of the fluid at a certain cross-section in the flow system. A. 1kg B. 1N C. 1mP S: 1) Those who provide a detailed analysis, discussion, or derivation process will be awarded 10-15 Wealth or 1-2 Charm: victory:. 2) Please hide your replies. The method to do this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Do not edit your replies after posting them{:1_90:}, and also avoid copying others’ answers, as that will result in a deduction of points:funk: ； Indicate the question number when answering; otherwise, it will be difficult to determine whether the answer is correct: handshake. 3) The reference answers will be available upon reply; those who want to confirm their answers may refer to: o. 4) Please also avoid submitting answers repeatedly in a malicious manner; if it is due to an operational error, please contact the forum moderators or administrators: call:. Otherwise, points will be deducted. Reference answer: A B C A