QUESTION EIGHT

a$)$ Define a Pump.

$(2$ Marks$)$

b$)$ State two $(2)$ categories of pumps according to the transfer of mechanical energy.

$(4$ Marks$)$

c$)$ Explain two $(2)$ advantages of centrifugal pumps over reciprocating pumps. $(4$ Marks$)$

d$)$ The impeller of a centrifugal pump has an external diameter of $450$ mm and internal diameter of $200$ mm and it runs at $1440$ rpm $.$ Assuming a constant radial flow through the impeller at $2\mathrm{.}5\frac{m}{s}$ and that the vanes at exit are set back at an angle of $25.$ Calculate;

i$)$ The inlet vane angle.

$(3$ Marks$)$

ii$)$ The angle between the absolute velocity at exit and the tangent.

$(3$ Marks$)$

iii$)$ Work done per Newton of Water.

$(4$ Marks$)$

$($TOTAL $20$ Marks$)$