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Reg. No. : ..................................... Name : ..........................................

Third Semester B.Tech. Degree Examination, November 2009 (2008 Scheme) 08.303 : FLUID MECHANICS AND MACHINES (MPU) Time : 3 Hours

Max. Marks : 100

Instruction : Answer all questions from Part – A and one full question from each Module of Part – B. PART – A 1. 2. 3. 4. 5. 6. 7.

State Newton’s law of viscosity. Define absolute viscosity of a fluid. What are the limitations of Bernoulli’s equation ? Explain the Reynold’s experiment. Describe the phenomenon of water hammer. Explain velocity of flow and velocity of whirl and state their difference. Describe a scheme of governing Pelton wheel. Explain the term specific speed as applied to hydraulic turbines. Derive the expression for specific speed. 8. Describe Rayleigh method of dimensional analysis. 9. What is manometric efficiency of a centrifugal pump ? 10. Explain the working of a jet pump. (10×4=40 Marks) PART – B MODULE – I 11. a) A rectangular metal plate of size 20 cm × 10 cm, weighing 1 kg f slides over a smooth long inclined plane of slope 15°. The slope is covered with an oil of viscosity 1.50 poise. Find the terminal velocity of the plate over the inclined plane if the thickness of the oil film below the plate is estimated to be 0.2 mm. b) Two pipes of lengths 2500 m each and diameters 80 cm and 60 cm respectively, are connected in parallel. The coefficient of friction for each pipe is 0.006. The total flow is equal to 250 litres/s. Find the rate of flow in each pipe. P.T.O.

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