Mechanical Equipment [Daily Question] Wednesday, December 14, 2011

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This post was last edited by zhiyuan1100 on 2011-12-15 11:24. Please hide your replies; edits are not valid after a post has been made! Those with different opinions on the provided answer keys can post discussions the next day. For responses from multiple accounts under the same IP, only the first one is considered valid. This is a multiple-choice question: 5 points are awarded for answering it correctly, 3 points for selecting most of the correct options, and 2 points for the rest. There is a reward for everyone who participates. Please hide your reply; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html Multiple-choice question: In which ( ) situations will the lubrication oil pressure of a centrifugal compressor decrease? A. The lubricating oil filter is clogged, resulting in excessive oil pressure loss ； B. The pressure gauge is malfunctioning, showing incorrect readings ； C. The return valve fails, causing the lubricating oil pumped by the oil pump to flow back to the tank through the return valve ； D. As the oil temperature drops, its viscosity decreases ； E. The oil pump is not operating properly. Answer: A B C E