Problem $2$

The centrifugal pump with a radial impeller shown is

tested at $1750$ rpm $.$ If the result is given as actual head

to be $60$ m at the design flow rate of $4\mathrm{.}5{10}^{-3}\frac{m}{m}.$ The

mechanical efficiency is $0\mathrm{.}90$ and the leakage flow rate

is $4\mathrm{.}5{10}^{-4}\frac{m^3}{s}.$

Determine the total efficiency if the slip factor is

estimated to be $0\mathrm{.}85.$

Answer:

${}_{\frac{o}{a}}=0\mathrm{.}75$