【Question 139】Boiler basic questions (January 4)

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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 considered 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 graded. Please hide your replies; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html 1. When the alkalinity of the boiler water is sufficient but the hardness is too high, generally ( ) is added. A. Sodium phosphate B. Disodium phosphate C. Sodium nitrate D. Sodium sulfite 2. When conducting boiler inspections, which of the following requirements is unnecessary? A. Tie up the closed globe valve on the steam supply pipeline with wire and attach a warning sign. B. Ensure adequate ventilation inside the boiler drum. C. The voltage of the working lights used for illumination should not exceed 24V. D. Remove all internal components such as the steam-water separator and supply pipes. Answer: B, D