Mechanical Equipment [Daily Question] Saturday, December 03, 2011

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This post was last edited by zhiyuan1100 on 2011-12-6 at 19:37. Please hide your replies; edits are not valid after a post has been made! Those with different views 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 all questions correctly, 3 points for answering each question correctly, and 2 points for the rest. There is a reward for everyone who participates. Please hide your replies; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Single-choice questions: 1. Compared to packing seals, centrifugal pump mechanical seals have lower leakage rates, and their power consumption is equivalent to that of packing seals at ( ). A、50% B、120%–150% C、10%–15% D、Almost equal. 2、During normal operation, the vacuum in the condenser is ( ) the vacuum at the inlet of the condensate pump. A、Greater than B、Less than C、Equal to D、Less than or equal to Answer: C A