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- Fluid Mechanics and Hydraulic Machines - FMHM
- 2017
- PYQ
**Biju Patnaik University of Technology Rourkela Odisha - BPUT**- Mechanical Engineering
- B.Tech
**9952 Views**- 391 Offline Downloads
- Uploaded 2 years ago

Registration No: Total Number of Pages: 02 B.Tech PCME4201 3rd Semester Back Examination 2017-18 Fluid Mechanics And Hydraulic Machines BRANCH: AERO, CIVIL, MECH, MINERAL, MINING Time: 3 Hours Max Marks: 70 Q.CODE: B863 Answer Question No.1 which is compulsory and any five from the rest. The figures in the right hand margin indicate marks. Q1 a) b) c) d) e) f) g) h) i) j) Q2 a) b) Q3 a) b) Answer the following questions: Explain the significance of kinematic viscosity. Explain the principle involved in measuring pressure and pressure difference using manometer. With the help of a neat sketch, define metacentre and metacentric height. When will streamlines, streaklines and pathlines coincide? Write down the expression for depth of centre of pressure for a vertically immersed plane and surface inclined at angle ‘ ‘ with horizontal. What are the limitations of Bernoulli’s equation? What do you mean by equivalent pipe? Explain, why the casing of a reaction turbine is spiral shape with uniform change in area? What are the function of guide blades in a reaction turbine? Write the function of air vessel used in reciprocating pump. (2 x 10) A glass tube of 8 mm internal diameter is immersed in a liquid at 20 0 C. The specific weight of the liquid is 20601N/m3. The contact angle is 600 and Surface tension is 0.1 N/m. Calculate the capillary rise and also the radius of curvature of the meniscus. A rectangular plate of 0.80 m×0.80 m dimensions weighing 500 N slides down an inclined plane making 300angle with horizontal, at a velocity of 2 m/s. If the 2 mm gap between the plate and inclined surface is filled with lubricating oil, find its viscosity. (6) A circular plate of diameter 2 m is submerged in water vertically such that its top surface is 1 m below the free surface of the water. Determine the total pressure force on the plate and the position of the centre of pressure. A ship of weight 32000KN is floating in sea water. The centre of buoyancy is 1.6 m below its centre of gravity. The moment of inertia of the ship area at the water level is 8320 m4. Find the metacentric height. Take specific weight of sea water is 10.1 KN/m3. (5) (4) (5) Q4 a) b) Derive Euler’s equations of motion for a streamline. A vertical pipeline 10 cm diameter at the top tapers uniformly to 20 cm at bottom. The length of the pipeline is 2 m. If the discharge through the pipeline is 30 litres/sec find the difference in pressure. Neglect friction. (5) (5) Q5 a) Obtain expression for Darcy- Weisbach friction factor, f for laminar flow in a pipe. Find the acceleration and vorticity components at a point (1,1,1) for the following flow field: u=3x2+2y; v=2xy+4y2+3zy; w=-3z2+2xz-9y2z (5) b) (5)

Q6 a) b) Q7 a) b) Q8 a) b) c) d) A pelton wheel has a mean bucket speed of 12 m/s and is supplied with water at the rate of 750 lits/sec under a head of 35 m. If the bucket deflects the jet through an angle of 1600, find the power and efficiency of the turbine. Take the coefficient of velocity as 0.98. Explain with the help of a sketch the working of a reciprocating pump. (6) With a sketch, explain the constructional features of a modern Francis turbine. A centrifugal pump impeller is 40 cm in outer diameter and 2.5 cm wide at exit and its blade angle is 1500. When run at a speed of 2100 r.p.m, the flow rate through the pump is 80 lit/sec. Calculate the radial, relative and absolute fluid velocities at the impeller exit. (4) (6) Write short notes on any two of the following. Fluid classification Pitot tube Multistage centrifugal pumps Indicator diagram (4) (5 x 2)

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