Daily Quizzes: Many Rewards (November 10–November 12)

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1. The reason why the exhaust temperature rises when the turbine load is too low is (). (A) The vacuum is too high. (B) The steam inlet temperature is too high. (C) The steam flow rate entering the turbine is too low to cool the heat generated by the blowdown friction loss. 2. The reason why frequent start-stop of the unit increases wear and tear is ( ). (A) The temperature difference between the upper and lower cylinders may cause friction between the moving and stationary parts. (B) Excessive differential expansion. (C) Fatigue damage in metal materials caused by thermal stress. 2. After the turbine is shut down, if the barring system cannot be activated in time or if the continuous barring is interrupted, the cause must be identified first; thereafter, the shaft should be aligned straight before resuming continuous barring. A. Rotate it 90° first B. Rotate it 180° first C. Rotate it one full circle first. Please hide your replies – editing after posting is not valid! 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. All three questions are multiple-choice questions; 3 points are awarded for each correct answer, and 10 points – worth either Wealth or Charm – are given for answering all three correctly. There is a reward for everyone who participates. Please hide your answers; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Those who provide in-depth explanations and discussions in addition to giving correct answers may receive additional rewards (no extra points will be given if answers are not hidden). The answers will be provided in the next issue