8/14/2019 e310-Fluid Mechanics and Hydraulic Machinery

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Code No: E310

II B.Tech(CCC) Regular Examinations, January 2010FLUID MECHANICS AND HYDRAULIC MACHINERY

Civil EngineeringTime: 3 hours Max Marks: 100

Answer any FIVE QuestionsAll Questions carry equal marks

1. Differentiate between:

(a) The impulse and reaction turbines

(b) The radial and axial slow turbines

(c) The inward and outward radial flow turbines

(d) Kaplan and propeller turbines. [20]

2. (a) Define the equation of continuity. Obtain an expression for continuity equationfor a three dimensional flow. [15]

(b) Define the following and give one practical example for each

i. Steady flow

ii. uniform flow. [5]

3. (a) Explain different factors affecting Mannings rugosity coefficient. [8](b) An earthen channel with a base width 2m and side slope 1 horizontal to 2

vertical carries water with a depth of 1m. The bed slope is 1 in 625. Calculatethe discharge if N=0.03. Also calculate the average shear stress at the channelboundary. [12]

4. (a) What is the role of volute and vortex chamber in a centrifugal pump. [6]

(b) What are the operating characteristics of a centrifugal pump? Sketch andexplain them. [8]

(c) When are centrifugal pumps coupled in parallel? Sketch and explain. [6]

5. (a) What is meant by geometric, kinematic and dynamic similarities? Are thesesimilarities truly attainable? If not why? [10]

(b) Define the following non-dimensional numbers: Reynoldss number, Froudsnumber and Machs number. What is their significances for fluid flow prob-lems? [10]

6. (a) What is meant by boundary layer? Why does it increase with distance fromthe upstream edge? [10]

(b) Define the terms: boundary layer thickness, drag, lift and momentum thick-

ness. [10]

7. (a) Explain how vacuum pressure can be measured with the help of a U- tubemanometer.

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8/14/2019 e310-Fluid Mechanics and Hydraulic Machinery

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Code No: E310

(b) A tank has a base 3m square, from which four sides slope outward at 600 tothe horizontal for a vertical height of 3m, they then turn vertically upwardsfor another 3m. Find the total pressure and the center of pressure on one ofthe sloping sides of the tank. [10+10]

8. (a) A jet of liquid coming out of nozzle is 25m/sec and it exerts a force of 4000Non a fixed flat plate held normal to the jet. If the velocity of jet is increasedat 30m/sec, find the increase in force acting on the same plate. [10]

(b) A nozzle of 5cm diameter discharges water with a velocity of 50m/sec andstrikes to a fixed flat plate. Find the force acting on the plate when the plateis vertical and plate is inclined to the jet by 400. [10]

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