Study the figure below for the Gould pump, model $3196$ ST $.$Impeller diameter $8$ in$,ST$

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$\text{'}AA$ Operating flow $70$ GPM : a$)$ The curves head vs capacity, b$)$ The curves of power $($HP$),$ the efficiency curves, d$)$ The NPSH curves. Now using the same pump, and for a $7(1)/(2)$ inches impeller, operating at $50$ GPM$,$ determine: a$)$ the head $($ft$),$ b$)$ The efficiency, c$)$ The power $($HP$),$ d$)$ the required NPSH$.$