A centrifugal pump operating under steady flow conditions delivers 2,270 kg/min of water from an initial pressure of 82,740 Pa to a final pressure of 275,800 Pa. The diameter of the inlet pipe to the pump is 24 cm and the diameter of the discharge pipe is 10.16 cm. What is the work done? a. 458.1 kJ/min b. -458.1 kJ/min c. 438.4 kJ/min d. -438.4 kJ/min

A boiler requires 100 000 m3/hr of standard air. The mechanical efficiency of fan to be installed is 70%. Determine the size of driving motor needed assuming fan can deliver a pressure head of 160mm of water and outlet velocity of 20m/s. A. 60kw              B. 81.8kw            C. 75.8kw            D. 71.81kw

Two centrifugal pumps, each capable of delivering a flow rate of 100 m³/h at ahead of 50 meters, are used in a water distribution system. If these pumps are operated inparallel, what is the expected combined performance of the system under idealconditions?A. A flow rate of 100 m³/h at a head of 100 meters.B. A flow rate of 200 m³/h at a head of 50 meters.C. A flow rate of 200 m³/h at a head of 100 meters.D. A flow rate of 100 m³/h at a head of 25 meters.

Complete the following tasks: QUESTION 1: A centrifugal pump consists out of an impeller, diffuser and casing and is powered by 300 kW (shaft power) and rotates at 96.3 rad/s. The flow rate generated by the machine is 54.7 Kilo-litres/min. The impeller blade inlet angle and width is 23° and 180 mm respectively. The blades occupy 12% of the impeller area and the water is assumed to enter the impeller radially. Suction and delivery pipes are equal in size. Determine: 1.1. The impeller inlet (i) diameter and inlet blade velocity. (Hint - Substitution: Vn in terms of Di and U, in terms of D; both sub into Tan of Blade inlet angle, only unknown is then solving for D?) ANS: 300 mm; 14.42 m/s If the pump has a mechanical efficiency of 80%, calculate the blade velocity at outlet (Uo) and outlet whirl velocity Vwo. Assume the blade exit angle equal to the guide vane angle. (Hint - Substitution: Write Vwo in terms of U. sub in Euler equation only unknown then is solve for Vwo) ANS: Vwo = 11.54…

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A right cylindrical container 4 m. diameter is 3 m tall. A 50 mm diameter hole is provided at the bottom of the container to drain the water when necessary. If it is full of water, how long in hours does it take to empty the container from the instant the hole is opened? Coefficient of velocity and coefficient of contraction are both equal to 1.0. A.1.39 hoursC.1.13hoursB.1.26 hoursD.1.49hours

4. A pump is used for the pumping of water from Tank A into Tank B in which the height difference between the surface levels of water is 20 m. The pipe diameter is 400 mm and the pipe length is 2500 m, the coefficient of friction is f 0.0025 and the pump works at a speed of 700 rpm. The characteristics of the pump are shown in Table 4 below You are required to: (a) (10 points) Intepret pump characteristic and system characteristic ina graph. (b) (10 points) Calculate the input and output power at the operating point. 0.1 0.2 0.3 0.35 0.4 0.5 15 17 18 16 14 O30 60 SI83.80 45 H. (m) 11 Table 4: Data of the pump from the Manufacturer

In a hydro-electric power plant, the difference in elevation between the surface of headwater and tail water surface is 182 m. When the flow is 2.25 m 3 /s, the friction loss in the penstock is 18 m and the head utilized by the turbine is 140 m. The mechanical friction in the turbine is 74.6 kW, and the leakage loss is 0.085 m 3 /s. Calculate: A. Brake powerB. Mechanical efficiencyC. Overall turbine efficiency

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