【Daily Question: Pump Equipment】Multiple-choice Question 2018.12.6

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bk08.jpg Rules for multiple-choice questions: 1. If the answer to each question is incorrect, you will still receive a reward of 2 Wealth points for your active participation； 2. A correct answer rewards 6 wealth points ； 3. Rewards for answers are available once per person only ； 4. Each reply allows for one management rating only ； 5. The answer and its explanation will be visible after responding ； 6. The reward is valid for 48 hours. The performance parameter values of a pump listed on its nameplate at the designed operating speed are generally those obtained when ( ) (single choice): A. The speed is at its highest; B. The flow rate is at its maximum and the head is at its highest; D. The net positive suction head is at its minimum; E. The shaft power is at its lowest; F. The pump efficiency is at its highest. Answer: F