Consider a turbine working under a head of 400 m with an efficiency of 90%. The approximate shaft power developed by the turbine for a flow rate of 20 m³/s is_ (A) 70 MW (B) 71MW (C) 68 MW (D) 80 MW
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- A Pelton wheel develops 70 kW under a head of 60 m of water. It rotates 400 rpm. Overall efficiency is 80%. Find the discharge rate in m³/s. Use the equation below, where P is power of the turbine shaft and no is the overall efficiency, where specific weight of water is is 9.80 kN/m³ no P YQH A generator is driven by a small, single-jet Pelton turbine designed to have a power specific speed sp 0.20. The effective head at nozzle inlet is 200 m and the nozzle velocity coefficient is 0.985. The runner rotates at 880 rev/min, The turbine overall efficiency is 80%. Find (a) the power delivered by the shaft of the turbine and (b) find the power delivered by the water to the turbine. where density of water is 1000 kg/m³ and g is 9.80 m/s². Use Stup Ω P/p (gHE)* Overall efficiency ne and Power developed at turbine shaft hydraulic power P YQHQ.8 A turbine is working under a head of 200 m. The power developed by the turbine is 100 kW and discharge through the turbine is 0.125 m/s. In such a case, the ratio of unit power to unit discharge for the turbine will be A 2000 в 4000 C 6000 D 8000A Kaplan turbine delivering 40 MW works under a head of 35 m and runs at 167 rpm.The hub diameter is 2.5 m and runner tip diameter is 5 m. The overall efficiency is 87%.Determine the blade angles at the hub and tip and also at a diameter of 3.75 m. Also find the speed ratio and flow ratio based on tip velocity. Assume nH = 90%. Outlet blade angle at the tip O 11.75 20.3 43.7 O 52.5
- = 0.547 59.6 Scanned by CamScanner 938 Power Plant Engineering 16 km. The efficiencies of turbine and generator are 93% each. The density os water is 1025 kg/m³. Calculate (a) the quantity of water flowing through c turbine at maximum output in m/s, (b) the surface area of reservoir in km², (c) the wash behind the embankment at full reservoir capacity, (d) energy produced in TWh per year. (1 TWh (tera-watt hour) = 10° GWh= 10° MWh= 10° kWh=10'² Wh=3.6× 10!5 , %3D %3D %3DA Kaplan turbine has the following specifications: H =25 ft., N= 400 rpm; power = 650 hp. If the efficiency of the unit is 90%, estimate (a) the flow rate, (b) approximate diameter of the runner, (c) turbine setting to avoid cavitation if the location is at sea level, and (d) turbine setting to avoid cavitation if the location of the unit is at an elevation of 5000 ft. The local temperature is 60°F. Ans: (a) Q=254 cfs; (c) Hs= 5.8 ft.; (d) 0.12 ftFor the figure shown below, what flow rate is required to produce 4,700 HP if the turbine is 72% efficient? D = 3 ft L 3,600 ft f=.026 11 MGD O 16 MGD 20 MGD O 25 MGD Az = 2,300 ft T Minor Loss Kent = 0.8 Kvalve = 5 Kelbow = 0.66 x 3 Kbend = 0.47 Kvalve = 2.2 Kexit = 1.0
- 200 kN/m Turbine 0.3 m/s'0.4 m dia. - 20 kN/m 0.6 m dia. Fig. 6.96 In Fig 6.96 what is the power developed by the turbine assuming efficiency of 80%? [Ans. 54 kW] jo 12:24B A hydraulic reaction turbine working under a head of 16 m develops 640 kW of power. What is the unit power of the turbine?A Kaplan turbine delivering 40 MW works under a head of 35 m and runs at 167 rpm.The hub diameter is 2.5 m and runner tip diameter is 5 m. The overall efficiency is 87%.Determine the blade angles at the hub and tip and also at a diameter of 3.75 m. Also find the speed ratio and flow ratio based on tip velocity. Assume nH = 90%. Inlet blade angle at the tip * O 166.08 140.23 133.67 165.73
- A Kaplan turbine has the following specifications: H =25 ft., N=400 rpm; power = 650 hp. If the efficiency of the unit is 90%, estimate (a) the flow rate, (b) approxi-mate diameter of the runner, (c) turbine setting to avoid cavitation if the location is at sea level, and (d) turbine setting to avoid cavitation if the location of the unitis at an elevation of 5000 ft. The local temperature is 60°F.Ans: (a) Q=254 cfs; (c) Hs=5.8 ft.; (d) 0.12 ft.A trial run on a steam turbine power plant gave the following resultsEntrance to boiler Exit of turbineMass flow rate =3600 kg/h Velocity of steam=25 m/sEnthalpy of water=850 kJ/kg Elevation above datum=0Elevation above datum=4.3 m Enthalpy of steam=2625 kJ/kgVelocity of water=5 m/sDetermine the power developed by the turbine if the heat added in the boiler is 2100 kJ/s.During a test run of a Pelton wheel turbine, the pressure at the nozzle was 2.25 MPa when water flowing in the penstock at 1.7 cubic meter/sec. The penstock diameter is 600 mm. Determine: a. The effective head in meters 255.09 231.27 241.36 b. The Water Power (WP) in kW 3,855 4,226 3,413 c. The turbine power in kW if the turbine efficiency is 80% 3,277 3,413 3,084 d. the generator output in MW if the generator efficiency is 92% 2.837 3.139 2,837