【Daily Question: Pump Equipment】Multiple-choice Question 2018.12.5

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This post was last edited by 3983596_FPPZ on 2018-12-6 at 13:24. For bk09.jpg: Rules for multiple-choice questions: 1. If the answer to each question is incorrect, active participation will earn a reward of 2 Wealth； 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 student has won another award; come by here every day. The centrifugal pump is used to transport water at room temperature. Given that the flow rate is 50 m3/h, the head is 32 m, the shaft power is 7.9 KW, the motor power is 11 KW, and the rotational speed is 2950 RPM, then the efficiency of the pump is closest to which of the following values? (Single choice) A 72% B 55% C 52% D 40% Answer: B. The formula for shaft power is: Shaft power = Flow rate * Head * Specific gravity / (3.6*10²*Efficiency)