A 37-cm-diameter centrifugal pump, running at 2140 r/min with water at 20°C, produces the following performance data: Q, m'ls | 0.0 | 0.05 | 0.10 | 0.15 | 0.20 | 0.25 | 0.30 105 104 102 100 95 202 | 228 H, m 85 67 P, kW 100 | 115 135 171 249 (a) Determine the best efficiency point. (b) Plot C, versus Co. (c) If we desire to use this same pump family to deliver 7000 gal/min of kerosene at 20°C at an input power of 400 kW, what pump speed (in r/min) and impeller size (in cm) are needed? What head will be developed?

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An air compressor is to compress 28.707 m^3/min from 130.588 kPa to 225.248 kPa. Assuming condition is ideal, and n=1.3 What will be the % increase due to 2 staging Answer in % and round off to 1 decimal places (e.g. 4.3%)

Q. The velocity of steam leaving a nozzle of Turbine is 896 m/s and the nozzle angle is 20°. The blade velocity is 300 m/s and the blade coefficient is 0.79. Assuming the mass flow rate as 1 kg/s and the runner blades are symmetric. Determine the power developed in kW

= (a) A centrifugal pump, with salt water as the working fluid, has the impeller blades rotating at 750 rpm. The fluid enters the blades in the radial direction, i.e. at an angle of α₁ = 0°, and exits the blades at an angle of 35° from the radial direction. i.e. α₂ = 35⁰. The inlet radius and blade width are r₁ 12.0 cm and b₁ = 18.0 cm, respectively. The outlet radius and blade width are 1₂ = 24.0 cm and b₂ = 16.2 cm, respectively. Assuming 100 percent efficiency, and if the volumetric flow-rate through the pump is 0.573 m³/s, compute the net head produced by the centrifugal pump. Furthermore, calculate the required brake horsepower in Watts. Take the density of salt water to be p 998.0 kg/m³. =