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Question 43957

posted 10 months ago

2. The diameter of the discharge side of a pump is 100and that of the intake pipe is 120 mm. , the pressure gage at discharge read 240 kpa and the pressure and the intake reads 60 kpa if Q=45 of water and the pump efficiency is 0.82 find the power delivered to the pump by the drive shaft the intake of the pump is 350 mm below the discharge side neglect the effects of pre rotation in the entry pipe and assume smooth flow at discharge from the pump

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Question 43961

posted 10 months ago

6. A certain axial-flow pump has a specific speed of Ns=5.0. If the pump is expected to deliver 3000 gpm when operating against a 15-ft head, at what speed (rpm)should the pump be run? (Hint: Watch "Chapter 12-Specific speed.mp4")

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Question 43960

posted 10 months ago

5. From the U.S. Army Corps of Engineers' record, two hydropower generators became operational in 1968 in Keystone Lake Dam in Tulsa, OK. During rainy season, one of the turbines is operating under a hydraulic head of 84 ft, producing a discharge of 5800 cfs and 34.8 MW power. If the head drops to 65 ft, determine the discharge and power generated. (Watch "Chapter 12-Scaling laws.mp4")

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Question 43962

posted 10 months ago

7. In a certain application, a pump is required to deliver 5000 gpm against a 300-fthead when operating at 1200 rpm. What type of pump would you recommend?(Hint: Watch "Chapter 12-Pump selection.mp4")

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Question 43956

posted 10 months ago

1. (FE Exam example) Natural gas (methane) enters a converging-diverging nozzle at 70 m/s, 227 °C, and 350 kPa, and it leaves the nozzle at a supersonic velocity.The throat diameter is 2.54 cm (1"). For natural gas R= 518.3 Pa.m³/kg.K; k= 1.31.Determine the velocity of helium at the throat and the mass flow rate. (Hint: Watch"Chapter 11-CO2 Converging-diverging.mp4").

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Question 43963

posted 10 months ago

8. A 10-inch model pump delivering water at 180°F at 800gal/min and 2500 rpm begins to cavitate when the inlet pressure and velocity are 14 psia and 22 ft/s,respectively. Determine the required NPSH for (i) the model and (ii) a prototype which is 5 times larger and runs at 1000 rpm (Hint: Watch "Chapter 12-NPSH.mp4")

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Question 43958

posted 10 months ago

3. Do problem 12.27 from the textbook [Statement: A centrifugal pump having a head-capacity relationship given by the equation; ha= 180 – 6.10×10ʻQ?, with hạ in feet when Q is in gpm, is to be used with a system similar to that shown in Figure 12.14. For Z2-Zı= 50 ft, what is the expected flow-rate if the total length of constant-diameter pipe is600 ft and the fluid is water? Assume the pipe diameter to be 4 in. and the friction factor to be equal to 0.02. Neglect all minor losses.]

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Question 43959

posted 10 months ago

4. Problem 12.35 from the textbook. [Statement: 12.35. A centrifugal pump with a 12-in diameter impeller requires a power input of 60 hp when the flow rate is 3200 gpm against a60 ft head. The impeller is changed to one with a 10 in. diameter. Determine the expected flowrate, head, and input power if the pump speed remains the same.]

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Question 43965

posted 10 months ago

10. In the Figure (regular 90° elbow flanged),the pump delivers 2cfs flow of 80°F water,and the intake pipe diameter is 8in. The pump intake is located 6ft above the water surface level in the reservoir. The pump operates at1750 rpm. What is the net positive suction head? (Hint: Watch "Chapter 12-NPSH2.mp4")

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Question 44014

posted 10 months ago

It's summer! That means that wasps form nests that are sometimes out of reach.Imagine that you want to spray a wasp nest from a pressurized container of wasp-killing fluid. (Side note: bees are helpful and friendly and we don't want to spraythose. Also, we want to be careful that the chemicals that we use for sprayingwasps aren't the kinds that contribute to bees' colony collapse disorder.)
You're standing directly under a wasp nest that is a vertical distance H above you.The wasp-killing fluid has a density p. The nozzle diameter is D. Neglect viscous effects as the fluid travels through the nozzle and assume that the tank is large enough for the flow to be quasi-steady.
[20 points] What gage pressure must the tank be pressurized to (Ptank) in order for the fluid to just barely reach the wasp nest? Express your answer in terms of known/given constants (e.g. H, p, etc.)
5. [20 points] When the tank pressure is properly met for question 4, what is thevolumetric flow rate (Qv) out of the nozzle? Express in terms of known/givenconstants (e.g. H, p, etc.)

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