The performance data for a centrifugal water pump are shown in Table below for water at 20°C (Lpm : liters per minute). (a) For each row of data, calculate the pump efficiency (percent). Show all units and unit conversions for full marks. (b) Estimate the volume flow rate (Lpm) and net head (m) at the BEP of the pump. V, Lpm H, m bhp, W 133 142 0.0 47.5 6.0 46.2 12.0 42.5 153 36.2 26.2 18.0 164 24.0 172 30.0 15.0 174 36.0 0.0 174

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.