Problems

$(2\mathrm{.}5$ pt $)$ You wish to use the pump shown in Figure $4\mathrm{.}2,$ but you want to replace the motor with one that operates at $1170$ rpm what will the pump operating point be if you change the motor?

$(2\mathrm{.}5pt)$ You wish to use the pump shown in Figure $4\mathrm{.}2,$ but you wish the operational flowrate to be $7100$ gpm $.$ What is the impeller diameter required meet this output?

The solid black line represents pump performance curve, the solid grey line represents system curve, the dashed line represents the efficiency curve $($read from right vertical axis$),$ the dotted line represents NPSH ${?}_R,$ and the dash$-$dot line represents the BHP$.$