One Question per Day on Refining Knowledge (Technology) 110308

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We welcome everyone 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 activity is 5 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 daily question’s answer key will receive appropriate rewards! The focus is on participation, and there are prizes for it. Please hide your replies; those that are not hidden will be deleted. Multiple-choice questions: 1. What desirable properties should refrigeration oil have? ( ) A: Viscosity B: Oxidation resistance C: Freezing point. 2. The heavy-duty leakage rate of the mechanical seal in a centrifugal pump should not exceed ( ) drops per minute. A: 5 B: 10 C: 20. 3. In the centrifugal compressor DA120-62, the number 120 represents ( ). A. Inlet pipe diameter B. Outlet pipe diameter C. Pressure D. Flow rate 4. The lighter the fraction, the greater its calorific value per unit weight, and the smaller its calorific value per unit volume. A. High, low B. Low, high C. Low, low D. High, high 5. Active sulfur that can react directly with metals – in addition to H2S, what else is present in petroleum? A. Thiols B. Thiols and sulfur C. Thiols and thiolates D. Sulfur and thiolates Answer: C ADAD