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- The net head delivered by a pump at a rotational speed of 1000 rpm is 10 m. If the rotational speed is doubled, the net head delivered will be (a) 5 m (b) 10 m (c) 20 m (d ) 40 m (e) 80 m1) Interpret solar power in the context of environmental impact.2. What is the rigid dichotomy between windmill and diesel-driven pumps?3. For a normal windmill-driven pump at 3 m/s wind speed, the yield at a 10 m Head is typically 0.12 liters/s per m2 of rotor area, value windmills in the context of yield.The Head -flowrate curve for a centrifugal pump is given by: HP = 28 -30Q2 Where, HP is in meter and Q is in m3/s . This pump is used to pump water for a system with the following (H-Q) curve: HS = 8 + 150Q2 Where, HS is in meter and Q is in m3/s . What is the resulting flow rate in the system if three pumps are used in series? (a) 0.56 m^3/s (b) 0.48 m^3/s (c) 0.33 m^3/s (d) 0.36 m^3/s HINT: what is the resulting Flow-rate in the system if three pumps are used in series ? Choose correct option above
- A pump is designed to deliver 9500 L/min of water at a required head of 8 m. The pump shaft rotates at 1100 rpm. The pump specific speed in nondimensional form is (a) 0.277 (b) 0.515 (c) 1.17 (d ) 1.42 (e) 1.88PAY ATTENTION TO THE QUESTION : What is the resulting flow rate in the system if three pumps are used in parallel? (a) 0.483 m^3/s (b) 0.364 m^3/s (c) 0.333 m^3/s (d) 0.563 m^3/s 1. The Head -flowrate curve for a centrifugal pump is given by: HP = 28 -30Q2 Where, HP is in meter and Q is in m3/s . This pump is used to pump water for a system with the following (H-Q) curve: HS = 8 + 150Q2 Where, HS is in meter and Q is in m3/s . IT SAYS : if theee pumps are used in parallel PAY ATTENTION Multiple choice choose correct answerA centrifugal pump delivers 25 liters of water per second against a head of 10 meters and running at 1300 rpm requires 10 kW of power. Determine the discharge, head of the pump and power required if the pump runs at 1500 rpm. (Ans. 0.0288cumec or 1.73 cu.m./min , 13.31m, 15.36kw)
- A centrifugal pump pumps water at a flow rate of 7 m³/s to a height of 10 m. If the pump works at the best efficiency point, find the pump impeller diameter, pump speed, the best efficiency value of the pump, the head at the best efficiency value, and the specific speed of the pump, given that CQ=0.15 CH=6 CP=0.75.Seven hundred gallons per minute of water are being discharged by a centrifugal pump 5 ft above the pump inlet. The inlet pressure is 4-in Hg above the atmospheric and the discharge pressure is 29 psia. If the pump has an 8-in diameter inlet and a 4-in diameter discharge, find the new flowrate if thr pump speed is doubled. Assume the pump input is 8Hp. A. 700 gpmB. 1050 gpmC. 1400 gpmD. 1750 gpm1. A centrifugal pump with 30 cm impeller delivers 30 l/s against a head of 24 m when running at 1750 rpm. What will be the delivery of a homologous pump of 15 cm impeller diam eter assuming same efficiencies and speed? 2. A centrifugal pump with 2.3 diameter impeller running at 327 rpm delivers 7.9 m3/s of water. The head developed is 72.8 m. The width of the impeller at outlet is 0.22 m. If the overall efficiency is 91.7% determine the power to drive the pump.
- A centrifugal pump with an overall efficiency of 0.56 rotates at 1650 rpm. The flow is purely radialat the inlet of the rotor. The pump has the following characteristics:Flow rate Q = 72 L/sInlet diameter D1 = 90 mmOutlet diameter D2 = 280 mmHead H = 25mWidth at the inlet b1 =20 mmWidth at the outlet b2 = 18 mmLeakage q = 2 L/sMechanical loss Pm = 1.41 kWBlade angle at the outlet β2 = 35ͦThe water density ?=998 ??/m^3Atmospheric pressure 101 kPa1) Draw the velocity triangles at the inlet and the exit of the impeller.2) Determine the magnitude of the absolute velocity of the flow (?) and the impeller velocity(U) at the inlet and outlet3) Determine the blade angle at the inlet.4) Determine the hydraulic, mechanical and volumetric efficiencies.5) Determine the minimum number of blades required for the slip to not exceed 0.9.6) Determine the static pressure difference (P2-P1) through the impeller by using Bernoulliequation.7) Determine the available NPSH if the pump is placed 2m above the…A centrifugal pump with an overall efficiency of 0.56 rotates at 1650 rpm. The flow is purely radialat the inlet of the rotor. The pump has the following characteristics:Flow rate Q = 72 L/sInlet diameter D1 = 90 mmOutlet diameter D2 = 280 mmHead H = 25mWidth at the inlet b1 =20 mmWidth at the outlet b2 = 18 mmLeakage q = 2 L/sMechanical loss Pm = 1.41 kWBlade angle at the outlet β2 = 35ͦThe water density ?=998 ??/m^3Atmospheric pressure 101 kPa1) Draw the velocity triangles at the inlet and the exit of the impeller.2) Determine the magnitude of the absolute velocity of the flow (?) and the impeller velocity(U) at the inlet and outlet3) Determine the blade angle at the inlet.4) Determine the hydraulic, mechanical and volumetric efficiencies.5) Determine the minimum number of blades required for the slip to not exceed 0.9.6) Determine the static pressure difference (P2-P1) through the impeller by using Bernoulliequation.7) Determine the available NPSH if the pump is placed 2m above the…Data: Hp2,3 = 2 m; A3 = 20 cm²; A₂ = 1 cm²; Hp0,1 = 0.8 m; NB= 74%(pump efficiency) To determine: a) the flow (L/s); b) the area of section (1) (cm³); c) the power supplied by the pump to the fluid.