The suction water level of a reservoir A is 5m above pump centerline and discharge water level is 50m above pump centerline. The discharge is 2m with suction pipe of 100mm diameter and 90mm diameter discharge pipe. The total head loss is 50% of the velocity head a suction pipe. If pump runs at 360rpm, find the torque developed by the shaft of motor if pump efficiency is 76%. ANSWER: 5.4 KN-m

A pump is needed to drain an excavation at a construction site. The excavation has alength of 50m, width of 50m, and a depth of 4m. The surface of the water in the excavation lies at adepth, H=3m, from the top the of the excavation. An old, radial flow, 1000W pump is immediatelyavailable for use; however, the total pump-motor efficiency, e, is only 50%. Estimate the drawdown inthe excavation in the first 4 hours of pumping. Neglect the change in H with increasing time. Neglectany head loss in the hose/pipe connected to the pump. (Hint: utilize the Pout equation, consider analternative definition of discharge as a change in volume over a change in time). Assume a specificweight of 9.79kN/m 3 .

A hydraulic vane pump running at 1800 rpm develops 2 L/s flow at 750 kPa. Volumetric efficiency is .85 and overall efficiency is 0.8. Determine the Actual Torque Required, TÀ (N- m). (Hint: first calculate the mechanical efficiency and theoretical flow rate. Convert rpm to rad/s). O 10.6 N-m O 9.94 N-m O 8.01 N-m O 9.35 N-m O 8.85 N-m

The oil tank for the hydraulic system of figure below is air-pressurized at 10 psig. The inlet line to the pump is 10 ft below the oil level while point 3 is 2ft below pump inlet. The pump flow-rate is 30 gpm and has a power equal to 0.5 HP. Find the pressure at station 3 if there is a 28 ft head loss between station 1 and 3.