【Daily Question: Pump Equipment】Fill-in-the-blank question, 2019.2.8
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Rules for the fill-in-the-blank questions in bg2.png: 1. If both blanks are answered incorrectly, +2 wealth is awarded for active participation; if one blank is answered incorrectly and the other correctly, +5 wealth is given; if both blanks are answered correctly, +8 wealth is awarded. 2. If only one answer is provided, unless it is clear which question’s answer it is, a correct answer earns +5 wealth points, while an incorrect answer earns +2 wealth points; in all other cases, it is counted as active participation and grants +2 wealth points. 3. Rewards for answers are available once per person only. 4. Each reply allows scoring for only one person. 5. The answer and its explanation will be visible after responding. 6. The reward is valid for 48 hours; no reward will be given if the deadline is passed. Studying* and winning awards again; come by here every day. For a centrifugal pump operating at its rated flow rate – with a flow rate of 110 m3/h, head of 85 m, efficiency of 65%, and rotational speed of 2900 rpm – the shaft power required to transport water at room temperature is ( ) kW, while the power of the motor needed is ( ) kW. Answer: 39.2, 45
39.2? ?? ? 45
At its rated flow rate, a centrifugal pump with a flow rate of 110 m3/h, a head of 85 m, an efficiency of 65%, and a rotational speed of 2900 rpm has an axial power of (39.2) kW when transporting clean water at room temperature; the power required for the motor driving this pump is (45) kW