JNTU
JNTU B.Tech II MECHANICS OF FLUIDS Previous Question Paper (May/June - 2019 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
PART-A
Define Kinematic Viscosity. State its units.
Answer
Kinematic viscosity is defined as the ratio of dynamic viscosity to the density of the fluid. It is denoted by the Greek letter nu (ν). The SI unit is m2/s and the CGS unit is stoke (1 stoke = 10-4 m2/s).
What is the difference between cohesion and adhesion?
Answer
Cohesion refers to the intermolecular attraction between molecules of the same substance, which allows the fluid to resist tensile stress. Adhesion refers to the attraction between molecules of different substances, such as between a fluid and a solid boundary, which causes the fluid to wet surfaces.
Define non uniform flow. Give one practical example for it.
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State and explain the Continuity equation for one dimensional flow.
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Define average velocity and give the mathematical expression for it.
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Write down the uses of dimensional analysis.
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Define the Pressure drag.
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Explain the fully developed flow.
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State the Darcy’s equation.
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Mention the types of minor losses along with the equations for it.
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PART-B
Derive an equation of hydrostatic equilibrium.
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Draw shear stress-shear rate diagram and explain rheological behavior of fluid with suitable examples.
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Determine the mass density, specific volume and specific weight of a liquid whose specific gravity is 0.86.
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Explain different types of manometers with neat sketches.
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A Pipe of 20 cm diameter and length 10 m is used to transport oil of specific gravity 0.9 and viscosity 1.5 poise. The oil is pumped at a rate of 20 lit/s. Find the average velocity and Reynolds Number.
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Discuss the following: i) Stream line and stream tube. ii) Streak line and path line.
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The velocity of incompressible fluid in a steady state system is directed along the y rectangular coordinate. Prove that the velocity is not a function of y.
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Discuss the following: i) Laminar flow. ii) Turbulent flow.
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Oil having specific gravity 0.8 is flowing in a rapier pipe line. The velocity at a section having 0.15 m2 area is founded to be 2 m/sec. Calculate the diameter of the pipe line at which the velocity is 2.7 m/sec. Also, find out the volumetric flow rate and mass flow rate.
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Derive an equation for the estimation of flow rate through venturimeter.
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State and derive the Bernoulli’s equation. Explain the significance of each term.
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Explain the Prandtl’s boundary layer hypothesis.
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What is the effect of pressure gradient on boundary layer separation?
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A smooth, flat plate of length 6 m and width 4 m is placed in water with an upstream velocity of 0.5 m/s. Determine the boundary layer thickness. Assume a laminar boundary layer.
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Discuss the growth of hydrodynamic boundary layer over a flat plate.
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Prove that the flow of a liquid in laminar flow between infinite parallel flat plates is given by
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Explain the variation of friction factor with Reynolds number.
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Describe major and minor losses in pipes, giving the expression for each.
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The Moody diagram illustrates the effect of roughness on the friction factor in turbulent flow but indicates no effect of roughness in laminar flow. Explain why this is so.
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