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1997 Course Fluid Machinery & Fluid Power

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Total No. of Questions : 10] P1306 [Total No. of Pages : 3 [3664]-16 B.E. (Mechanical Sandwich) FLUID MACHINERY & FLUID POWER (1997 Course) (402062) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer any three questions from each section. 2) Answer to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of electronic pocket calculator is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) b) Q3) a) Show that when a jet of water impinges on a series of curved vanes, maximum efficiency is obtained when the vane is semi-circular in section and the velocity of vane is half that of jet. [8] A 2.5 cm diameter jet of water strikes a symmetrical vane tangentially at one end and leaves at the other end. After impingement, the jet gets deflected through 160 by the vane. Calculate the thrust exerted by jet on the vane if the discharge is 0.00736 m3/s. Presume the vane to be smooth. [8] Explain the characteristic features of the cup of a Pelton wheel. What are the limitations in keeping the deflection angle of the cup as 180 ?[6] A Pelton wheel works at the foot of a dam because of which the head available at the nozzle is 220 m. The nozzle diameter is 20 cm and the coefficient of velocity is 0.98. The wheel operates at 250 rev / min and develops 3.75 MW of power. Assuming that the blade outlet angle is 16 and the wheel of jet speed ratio is 0.46, make calculations for the wheel diameter at the pitch circle of the blades, the hydraulic efficiency and the turbine efficiency. [10] Discuss in general the main & operating characteristics of a hydraulic turbine. [6] P.T.O.

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