【Question 142】Boiler Foundation Questions (January 8)

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Please hide your replies; be careful when posting, as edits are invalid! Those with different views on the provided answer keys can post discussions the next day. For multiple accounts under the same IP responding to participate, only the first response is valid. All participants receive 2 points as a reward. This round consists of multiple-choice questions, with 2 points for each question; 5 points are awarded for getting all questions correct. In principle, the top 50 respondents who answer within 48 hours will be scored. Please hide your replies; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html. 1. There is a regulating valve installed on the boiler’s blowdown pipeline: ① Regulating valve ； ②Waste discharge valve ； ③For the Tonghai valve, during sewage discharge, the correct sequence of opening is ( ). A. ①→②→③　　　　 B. ③→①→② C. ②→①→③ D. ③→②→① 2. The lip structure installed on the boiler safety valve is mainly intended for ( ). A. Reduce the opening pressure　　　　　B. Increase the opening pressure C. Decrease the amount of pressure drop　　　　　D. Ensure stable operation upon opening Reference answers: D, D