One Question per Day on Chemical Equipment 2011.04.05

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This post was last edited by sean816 on 2011-4-6 at 11:02. 1. Which of the following statements regarding the operation of high-pressure plunger pump injectors is incorrect? (　　) A. It is strictly prohibited to start the pump when pressure is built up at the outlet. B. When the pressure inside the pump exceeds the rated value, the safety valve opens, causing the pump to stop automatically. C. If the pump emits abnormal noises or if its moving parts and packing become hot, it is necessary to stop the pump immediately for inspection and repair. D. It is strictly prohibited to perform adjustments or repairs while the pump is operating under load. 2. Since the bearings of pump equipment are subject to high loads, lubricating oil with ( ) viscosity should be used ； The bearing load is low; use lubricating oil with ( ) viscosity. A. High, high B. Low, low C. High, low D. Low, high 3. When the suction pressure of the compressor is low, it will cause the exhaust temperature to ( ), and a malfunction in the suction valve will cause the suction temperature to ( ). A. High, High B. High, Low C. Low, High D. Low, Low 4. Among the methods for adjusting the displacement of a reciprocating piston compressor during operation, which method results in the greatest waste of power? (　　) A. Throttling for import and export flow control B. Pushing open the suction valve C. Supplementary clearance volume D. Speed regulation 5. The most economical method among those used to regulate the outlet flow rate of a piston compressor is (　　). A. Change the speed B. Press down on the intake valve C. Connect the outlet to the inlet D. Connect to a auxiliary volume. Answers: B, C, A, A, A. Note: Answers are hidden; 1 point per question, with a reward for getting all answers correct. In principle, scoring is conducted for the first 50 floors within 24 hours.