Water is being pumped from a large lake to a reservoir 25 m above at a rate of 25 L/s by a 11-kW (shaft) pump. If the irreversible head loss of the piping system is 5 m, determine the mechanical efficiency of the pump. The mechanical efficiency of the pump is 0.6688636 %.
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- 4. A pump delivers water from a lower to a higher reservoir. The difference in elevation between the reservoirs is 10 m. The pump provides an energy head of 11 m and the frictional losses amounts to 0.7 m. If the pipe diameter is 250 mm, calculate the discharge.The pump draws water at 30 liters per second from reservoir A and lifts it to reservoir B as shown. The head loss from A to 1 is three times the velocity head in the 150mm diameter pipe and the head loss from 2 to B is twenty times the velocity head in the 100mm diameter pipe. Which of the following most nearly gives the powet delivered by the pump? Choices: 59.38 kW 75.14 kW 44.82 kW 53.96 kW3. A pump draws water at 300 liters per second from reservoir A and lifts it to reservoir B as shown. The head loss from A to 1 is 20 times the velocity head in the 200 mm diameter and the head loss from 2 to B is 20 times the velocity head in the 150-mm diameter pipe. Assume your own reservoir B elevation then compute for the energy that must be supplied to the pump in kW if said appurtenance has an efficiency of 80%. Compute also the pressure at points 1 and 2. Reservoir A 200 mm pipe Pump 150 mm Reservoir B
- 3. A pump draws water at 300 liters per second from reservoir A and lifts it to reservoir B as shown. The head loss from A to 1 is 20 times the velocity head in the 200 mm diameter and the head loss from 2 to B is 20 times the velocity head in the 150-mm diameter pipe. Assume your own reservoir B elevation then compute for the energy that must be supplied to the pump in kW if said appurtenance has an efficiency of 80%. Compute also the pressure at points 1 and 2. Reservoir A 200 mm pipe Elevation=-20 m Point 1 Point 2 Pump 150 mm A Reservoir B6. A centrifugal pump discharging 900 gpm and operates at 1800 rpm against a head of 120 feet has a power output of 30 hp. If the pump is to operate at 1200 rpm assuming efficiency remains constant. Determine the new discharge in gpm, the head and power.Q(1): A horizontal rectangular stilling basin is used at the outlet of a spillway to dissipate energy. The spillway discharges 13m'/s and has a uniform width of 12m. At the point where the water enters the basin, the velocity is 10m/s, compute: • The sequent depth of the hydraulic jump, The length of the stilling basin, • The energy loss in the jump, • The efficiency of the jump (the ratio of specific energy after to the specific energy before the hydraulic jump, • If the thickness of the basin is 0.75m, and the sieve analysis for the site soil indicate the d50 is 0.05mm, are the requirements of scour design satisfied or not?
- Water is pumped from a large reservoir to a storage tank 30m above via a constant diameter pipe. The volumetric flow rate during pumping is 55 L/s. This is found to require 25kW of electrical power input to the motor driving the pump. The top of the storage tank is open to the atmosphere. The water density, p=1000kg/m³, and the absolute viscosity, u=1mPa.s. Determine: a) The overall efficiency of the pump-motor unit if all frictional losses in the pipes are neglected. b) The pressure difference between the inlet and the exit of the pump for the same case as part a). c) Frictional losses in the pipe are found to be significant. If the length of pipe between the pump and the storage tank is 130m, the pipe diameter is 20cm, and the surface roughness is 0.4mm, determine a more accurate estimate for the overall efficiency of the pump-motor unit. Minor losses can be neglected.A pump is attached to a fire hydrant to produce a jet that rises to a minimum height of 13.5 m at a rate of 20 L/s. The pressure is estimated as 100 kPa at the attachment. The hose attached to the pump is 75 mm in diameter and 1.5 m long with a discharge nozzle at the end. The nozzle is inclined at an angle of 50 degrees to the horizontal. The pump has an efficiency of 80%. Neglect friction. Jet 13.5 m 14.0 Determine the minimum power that the pump can supply. a.) 2793 W b.) 3298 W 15.0 Determine the minimum rated power of the pump. c.) 3088 W e.) d.) 2882 W a.) 3860 W c.) 3492 W e.). b.) 3603 W d.) 4123 WThe loss of energy head in a hydraulic jump formed in a rectangular channel is (4.25 m). Froude number just before the jump is (7.5). find a-The discharge per meter width of the channel b-The power loss per meter width of the channel c-The length of the jump d-Type of the jump
- - Water is flowing at a critical depth of flow = 1.4 m in a channel shown in the figure below. Estimate the discharge and specific energy in the channel. 몰 0.5 1 2.4 m- 1.4 mWater is flowing in a 3 m wide rectangular channel. A hydraulic jump occurs and the flow upstream is 360 mm deep while the flow downstream from the jump is 1300 mm deep. A) Find the discharge flowing in the channel. B) Find the energy absorbed by the jump in kW. Please answer correctlyIn a hydroelectric power plant, water at 4°C is supplied to the turbine at a rate of 0.58 m³/s through a 195 m-long and 0.34 m-diameter cast iron pipe, as shown in the following figure.. The elevation difference between the free surface of the reservoir and the turbine discharge is 135 m, and the combined turbine-generator efficiency is 85 percent. Disregarding the minor losses due to the large length-to-diameter ratio of the pipe, determine the electric power output of this plant. The density and dynamic viscosity of water at 4°C are p = 1,000 kg/m³ and μ = 1.6×10-³ kg/m-s, and the roughness of the cast iron pipe is & 0.00026 m. = Water 135 m 195 m 0.34 m Turbine