A 37-cm-diameter centrifugal pump, running at 2140 rev/min with water at 20C produces the following performance data:

Question:

A 37-cm-diameter centrifugal pump, running at 2140 rev/min with water at 20°C produces the following performance data:
Q, m3/s: 0.0 0.05 0.10 0.15 0.20 0.25 0.30
H, m: 105 104 102 100 95 85 67
P, kW: 100 115 135 171 202 228 249
η: 0% 44% 74% 86% 92% 91% 79%
(a) Determine the best efficiency point.
(b) Plot CH versus CQ.
(c) If we desire to use this
same pump family to deliver 7000 gal/min of kerosene at 20°C at an input power of 400 kW, what pump speed (in rev/min) and impeller size (in cm) are needed? What head will be developed?