281. The diameter of the discharge pipe is 8 in. and that of the intake pipe is 10 in. The pressure

gage at discharge reads 32 psi, and vacuum gage at the intake reads 12 in. Hg. If the discharge

flow rate = 4.0 ft3

/s of water and the brake horsepower is 49.0, find the efficiency. The intake

and the discharge are at the same elevation.

A. 82.2% B. 80.9% C. 55.8% D. 58.46%