Refining Knowledge (Technology) Daily Question (42) 11.5

Thread Content

This post was last edited by akzo2008 on 2009-11-6 00:35. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the refining technology exchange area! In accordance with the forum’s unified requirements, the maximum score for this event is 10 Wealth points, and rating charm is prohibited. At the same time, friendship requests and duplicate ratings are declined. Be careful when posting; editing is ineffective! Those who have different opinions on the provided answer keys can post discussions the next day; those who provide solutions or their own opinions regarding the answer to the daily question will receive appropriate rewards! The focus is on participation, and there are prizes for participating! To prevent some members from copying the answers of other members, please hide your posts when answering questions; only hidden answers will be valid. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Note: Daily questions on refining knowledge (technology) are being urgently sought; those who can create questions can visit: http://bbs.hcbbs.com/thread-553526-1-1.html We hope that participants will take an active role in answering these questions! I. Multiple-choice Questions
1. For the pressure gauge installed on a pressure vessel, the maximum value indicated on its dial should be 1.5–3 times the vessel’s highest operating pressure. The best value is ( ).
A. 1 time
B. 1.5 times
C. 2 times
D. 2.5 times

2. During water pressure testing, the test pressure is ( ) of the operating pressure.
A. 1.1 times
B. 1.25 times
C. 2.0 times

3. During the shutdown and maintenance of a facility, the wastewater from cleaning the equipment should be discharged into the ( ) system.
A. Pretreated water system;
B. Oily wastewater system.

4. The lower the lower limit of the flammability (explosion) limit, the greater the fire risk ( ).
A. Greater
B. Smaller
C. Less likely.

5. Among petrochemical products, those with a flash point equal to or less than 45°C belong to ( ).
A. Flammable gases;
B. Combustible gases;
C. Flammable liquids;
D. Combustible liquids.

II. True or False Questions
1. The temperature of the water in the softening tank determines the temperature of the water at the outlet of the softening water pump ( ).
2. The higher the vacuum level, the higher the liquid level in the drying tower ( ).
3. The stroke of the valve stem is proportional to the output signal of the valve positioner ( ).
4. The partial pressure of each component in a mixed gas is equal to the total pressure multiplied by the mole fraction of that component in the mixture ( ).
5. Acidic gases containing H2S in refineries are generally sent to the flare system for combustion ( ).

10 questions per day, including multiple-choice and true or false questions; 1 reward point for each correct answer. Note: The answers will be released at least 16 hours later, and scoring will be given after they are made available. No further scoring will be conducted for those who respond after the answers have been released. Answer: cbbac ynyyn