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THE FUTURE DEPENDS ON WHAT YOU DO TODAY

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Registration No: Total Number of Pages: 02 B.Tech PCAT4201 3rd Semester Back Examination 2017-18 FLUID MECHANICS AND MACHINERY BRANCH : AUTO Time : 3 Hours Max Marks : 70 Q.CODE : B864 Answer Question No.1 which is compulsory and any five from the rest. The figures in the right hand margin indicate marks. Q1 Q2 Q3 a) b) c) d) e) f) g) h) i) j) Answer the following questions: Differentiate ideal and real fluids. Define centre of buoyancy. What is momentum equation? What is non-Newtonian fluid? What is viscosity of fluid? What is surface tension? Distinguish between gauge pressure, absolute pressure and vacuum pressure What is water hammer? What is cavitation? Where does it occur in centrifugal pumps? What is the specific speed of a turbine? a) Determine the pressure at point X for the situation shown in Fig. (5) b) The wall of a reservoir is inclined at 30° to the vertical. A sluice 1m long along theslope and 0.8 m wide is closed by a plate. The top of the opening is 8 m below the water level.Determine the location of the centre of pressure and the total force on the plate. (5) a) Determine the maximum weight that may be supported by a hot air balloon of 10 m diameter at a location where the air temperature is 20° C while the hot air temperature is80° C. The pressure at the location is 0.8 bar. R = 287 J/kg. K. Oil of specific gravity of 0.9 flows through a venturimeter of diameters 0.4 and 0.2 m. A Utube mercury manometer shows a head 0.63 m. Calculate the flow rate. (5) b) (2 x 10) (5)

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Q4 a) b) A liquid with specific gravity 0.8 flows at the rate of 3 l/s through a venturimeter of diameters 6 cm and 4 cm. If the manometer fluid is mercury (sp. gr = 13.b) determine the value of manometer reading, h. In the atomization of a fluid by passing it through an orifice under pressure, the droplet size d is believed to depend on the jet diameter D, jet velocity u, and the density, viscosity and surface tension of the lqiuid. Determine dimensionless parameters for the phenomenon. (5) (5) Q5 a) b) Explain the Hagen Poiseullie’s equation. A double acting reciprocating pump has a bore of 150 mm and stroke of 250 mm and runs at 35 rpm. The piston rod diameter is 20 mm. The suction head is 6.5 m and the delivery head is 14.5 m. The discharge of water was 4.7 l/s. Determine the slip and the power required. (5) (5) Q6 a) b) Explain how hydraulic turbines are classified. At a location the head available was estimated as 200 m. The power potential was 50,000 kW. The sheed chosen is 600 rpm. Determine the specific speed. Indicate what type of turbine is suitable. (5) (5) The diameter and width of a contrifugal pump impeller are 50 cm and 2.5 cm. The pump runs at 1200 rpm. The suction head is 6 m and the delivery head is 40 m. The frictional drop in suction is 2 m and in the delivery 8 m. The blade angle at out let is 30°. The manometric efficiency is 80% and the overall efficiency is 75%. Determine the power required to drive the pump. Also calculate the pressures at the suction and delivery side of the pump. (10) Q7 Q8 a) b) c) d) Write short answer on any TWO: Metacentric height Stream line , Streak line and path line Buckingham’s theorem Net positive suction head (5 x 2)