【Test Your Knowledge】Basic Chemical Engineering Knowledge (255) Please hide your replies

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This post was last edited by zhangyong6404 on 2009-11-29 at 23:52. In accordance with the forum’s guidelines, the maximum score for this activity is 15 Wealth points; giving scores based on charm is prohibited. At the same time, friendship requests and repeated ratings are declined. To encourage active participation from members, full marks are given for all correct answers, while 10–12 wealth points are deducted for each incorrect answer. 2 mistakes result in 8–10 wealth points; the rest receive encouragement bonuses of 4–6 wealth points. Basic Chemistry Section (Multiple-choice Questions): 1. Among the following statements related to human physiology, which one is incorrect? ( ) A. The end products of the metabolism of fat (which is composed of carbon, hydrogen, and oxygen elements) in the human body are CO2 and H2O. B. During intense physical activity, the body’s metabolic rate increases, and the metabolic waste products cannot be eliminated in time, resulting in an increase in the pH of the blood. C. Human gastric juice contains a small amount of hydrochloric acid, which helps with digestion. D. Gas poisoning occurs mainly because CO binds tightly to hemoglobin, preventing it from carrying oxygen. 2. After collecting HCl in a 1 L dry flask using the displacement method, it was found that the relative density of the gas inside the flask with respect to oxygen was 1.082. When using this flask for the fountain experiment, the volume of liquid inside the flask after the fountain stops is ( ). A、1L B、3/4L C、1/2 L D、1/4L 3、When equal amounts of SO2 and H2S react fully in a closed container of constant volume at room temperature, and then the temperature returns to normal, the pressure inside the container will be ( ) of the original pressure. A、l／2 B、1／4L C、l／4 4. When one hydrogen atom on the benzene ring of toluene is replaced by an alkyl group containing 3 carbon atoms, the possible monosubstituted products are ( ). A. Three B. Four C. Five D. Six 5. Among the following substances, which one can undergo oxidation, elimination, and esterification reactions under different conditions? ( ) A. Ethanol B. Acetaldehyde C. Acetic acid D. Benzoic acid. Chemical principles section (single-choice question): 6. What are the requirements for the daily maintenance of ventilators? ( ) A. Maintain proper lubrication of the bearings, with the temperature not exceeding 65°C. B. Ensure that the cooling water flows smoothly, with the outlet temperature not exceeding 35°C. C. Check for any abnormal noises or vibrations in the fan, as well as whether the anchor bolts and fasteners are tight; keep the equipment clean and ensure all components are present. D. All of the above three requirements. 7. When using a reciprocating pump and finding that the flow rate is insufficient, what could be the cause? ( ) A. Loose inlet and outlet slide valves, damaged springs; B. Clogged filter or gas present in the cylinder; C. Reduced number of reciprocations; D. All of the above three reasons. 8. The fundamental reason for energy loss during fluid flow is the presence of ( ) in the fluid. A. Pressure B. Kinetic energy C. Turbulence D. Viscosity 9. Water with a constant flow rate flows in laminar form inside a circular straight pipe. If the inner diameter of the pipe is doubled, the flow resistance will be ( ) of the original value. A、1/2 B、1/4 C、1/8 D、1/32 When using an outlet valve to regulate the flow rate of a centrifugal pump, increasing the opening of the outlet valve results in a ( ) head. A. Increase B. Remain unchanged C. Decrease D. Increase first then decrease. No score will be given if not hidden per the principles. Thank you all! To hide the method, click here: Hide method. Answer using the same IP; only the first post is valid. Also, be careful when posting; edits are invalid! To encourage independent thinking, those who answer all questions correctly are invited to go to the dedicated reward collection post in [Test Your Knowledge] to claim their prizes (click the link)! Answer: BBBDA DDDDC