Reference no: EM133203299

1. A double suction centrifugal pump delivers 70ft /sec of water at a head of 12m running at 1250rpm. What is the specific speed of the pump?

2. The centerline of a centrifugal pump is located 2.5m above from the high tide level. The seawater varies two meters from high tide to low tide level. If friction loss at the suction is 0.8m, determine the total suction head.

3. A centrifugal pump requires 40ft head to deliver water from low level to higher level. If pump speed is 1600rpm, determine the impeller diameter of the centrifugal pump.

4. The suction pressure of a pump reads 2-inches mercury vacuum and discharge pressure reads 130psi is use to deliver 100gpm of water with specific volume of 0.0163ft /Ib. Determine the pump work.

5. A pump is to deliver 150gpm of water at a head of 120m. If pump efficiency is 70%, what is the horsepower rating of motor required to drive the pump?

6. A motor is used to drive a pump having an efficiency of 85% and 70% respectively. What is the combined efficiency of pump and motor?

7. In a boiler feed pump, the enthalpy at the entrance is 765kJ/kg. If pump has a head of 900m, what is the exit enthalpy of the pump?

8. A submersible pump delivers 350gpm of water to a height of 5ft from the ground. The pump was installed 120ft below the ground level and draw down of 8ft during the operation. If water is 25ft above the pump, determine the pump power.

9. Determine the number of stages needed for a centrifugal pump if it is used to deliver 400gal/min of water and pump power of 15hp. Each impeller develops a head of 38ft.

10. A boiler feed pump receives 50liters/second of water with specific volume of 0.00112m3/kg at a head of 750m. What is the power output of the driving motor if pump efficiency is 65%?