【Test Your Knowledge】Basic Chemical Engineering Knowledge (201) Please hide your replies

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This post was last edited by eastchen on 2009-9-25 at 15:21. In accordance with the forum’s rules, the maximum score for this activity is 15 Wealth points; giving scores based on charm is prohibited. Friendship requests and duplicate ratings are also 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, while additional points of 4–6 wealth are given as encouragement for participation. 1. The impurities in the ZnO raw material containing impurities such as CuO, Fe2O3, and PbO can be removed by treating it with the following ( ) substances. A, H2SO4 ； B, HCl ； C, NaOH ； D. Na2CO3 2. Which of the following substances contains hydroxyl functional groups? A、Methyl acetate ； B、Acetaldehyde ； C. Ethanol ； D. Dimethyl ether. 3. Steel grade 20 indicates that the carbon content in the steel is ( ). A. 0.02% ； B, 0.2% ； C, 2.0% ； D. 20% 4. The airtightness test of pressure vessels should be carried out at ( ). A. After passing internal and external inspections as well as weld non-destructive testing ； B. After passing the voltage test ； C. Before the voltage withstand test is conducted ； D. No special requirements. 5. When using a thermocouple for measurement, if the wire is broken, the indication on the temperature recording instrument will be ( ). A. 0℃ ； B. Mechanical zero point ； C. Maximum value ； D. The original measurement value remains unchanged. 6. When the vapor of a flammable liquid mixes with air and comes into contact with an open flame, it causes instantaneous combustion. The lowest temperature at which such a liquid can burn is referred to as the （） of that liquid. A. Flash point ； B. Boiling point ； C. Ignition point ； D. Auto-ignition point 7. Thin-layer fixed-bed reactors are mainly used for ( ) A. Rapid reactions ； B. Strong exothermic reaction ； C. Reversible equilibrium reactions ； D. Reversible exothermic reaction 8. The function of the impeller is ( ) A. To transfer kinetic energy ； B. Transfer of potential energy ； C. Transfer of static pressure energy ； D. Transmission of mechanical energy 9. The determination of the liquid’s liquid seal height is based on ( ) A. The continuity equation ； B. Material balance equation ； C. Static equations ； D. Newton’s law of viscosity 10. During the operation of a distillation column, what is the relationship between the reflux ratio and the number of theoretical plates? ( ) A. As the reflux ratio increases, the number of theoretical plates also increases ； B. As the reflux ratio increases, the number of theoretical plates decreases ； C. At full reflux, the number of theoretical plates is at its maximum, but no product is produced at this time ； D. When the reflux ratio is at the minimum value, the number of theoretical plates is minimal. Answer for question 201: CCBAC AADCB; no scoring is given in principle if it is not hidden. Thank you all! To hide the method, click here: Hide method. Answers using the same IP are valid only for the first post. 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 award collection thread on 【Test Your Knowledge】 to claim their prizes (click the link)!