Answer

$9.(4$ points$)$ A pump delivers water flow from reservoir A to reservoir D$.$ If the suction pipe and discharge pipe have the same diameter, the length of suction pipe $($ AB $)$ is $60$ ft $,$ and the length of the discharge pipe $($CD$)$ is $240$ ft $.$ Given the total head loss from pipe $AB$ is $8$ ft $.$ Ignore minor losses, the head delivered by the pump is

A$.H_P=150ft$

B$.H_P=158ft$

C$.H_P=182ft$

D$.H_P=190ft$

Answer

$10.(4$ points$)$ A pump operating at a speed of $1000$ rpm to deliver $1\frac{m^3}{s}$ water from tank $A$ to tank $B.$ If the static head is $12$ m and at the operating point the total pump head is $24$ m $.$ If the flow rate needs to be increased to $1\mathrm{.}5\frac{m^3}{s},$ what is the minimum operating speed.

A$.n=1225rpm,$

B$.n=1275rpm$

C$.n=1500rpm$

D$.n=2250rpm$