One Question per Day on Synthetic Ammonia (Series 61)
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This post was last edited by penghh1985 on 2016-4-6 at 12:38. I. Multiple-choice questions (each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets). Continuing from series 6146: The factor that can change the standard equilibrium constant value of a reversible reaction is (). A. Changing the concentration of the reactants B. Changing the temperature C. Using a catalyst D. Increasing the total pressure 147. For pressure testing ordinary containers, it should be (). A. Hydrostatic testing is the preferred method. B. Pneumatic testing is the preferred method. C. Hydrostatic testing is only carried out on containers where pneumatic testing is not suitable. D. Either hydrostatic or pneumatic testing can be chosen arbitrarily. 148. When the oxygen concentration in the air is below (), wood combustion stops. A、2%～6% B、8%～10% C、14%～16% D、20%～24% 149. Fires involving substances that burn when in contact with water must not be extinguished using (). A. Dry powder extinguishing agent B. Dry sand C. Foam extinguishing agent D. Carbon dioxide extinguishing agent. 150. When a fire breaks out in the gas system of a chemical plant, the shut-off valves should be closed immediately. The purpose of this is to ( ) A. Eliminate combustibles B. Eliminate oxidizers C. Eliminate the source of ignition D. Reduce system pressure. Answer: B. ACCCA Scoring criteria: 3 points for participation, 1 point for each correct answer
BACCB~~~~~~~~~~~~
146、B、Change the temperature 147、A、Hydraulic testing is the preferred method 148、C、14%～16% 149、C、Foam extinguishing agent 150、A、Remove combustible materials
When a gas system catches fire, the combustion is intense; especially in high-pressure gas systems, the fire spreads rapidly, and firefighting equipment often proves ineffective. At this point, immediately closing the shut-off valve is an isolation method as part of the fire extinguishing measures; its purpose is to prevent the flammable gases within the system from continuing to flow into the fire area, thereby facilitating fire suppression. See page P214 of the textbook.