JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year FLUID MECHANICS - I Previous Question Paper (May/June - 2019 - R16)
Answer any five questions. Part A is compulsory. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Explain the terms intensity of pressure and pressure head.
Answer
Intensity of pressure is defined as the force exerted by a fluid per unit area of the surface on which it acts. Pressure head represents the height of a fluid column of a specific density that would exert a given pressure at its base, calculated as p/ρg.
Differentiate between simple and differential types of manometers.
Answer
A simple manometer measures the pressure at a single point in a fluid pipe or container relative to atmospheric pressure. A differential manometer is used to measure the difference in pressure between two distinct points in a pipe or between two different pipes.
What is meant by one-dimensional, two dimensional and three dimensional flows?
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Define the terms: Metacentre and metacentric height.
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Enumerate the relative merits and demerits of venturimeter with respect to orifice-meter.
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A rectangular weir 6 m long is divided into 3 bays by two vertical posts each 0.3 m wide. Find the discharge when the head is 0.45 m.
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What do you mean by flow through parallel pipes?
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Explain the terms hydraulic gradient and total energy lines.
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Enumerate the different methods of preventing the separation of boundary layer.
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Why does boundary layer increase with distance from the upstream edge?
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Part B
Through a very narrow gap of height h, a thin plate of large extent is pulled at a velocity V. On one side of the plate is oil of viscosity μ1 and on the other side oil of viscosity μ2. Calculate the position of the plate so that (a) the shear force on the two sides of the plate is equal; (b) the pull required to drag the plate is minimum.
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Show that the centre of pressure of any lamina immersed under liquid is always below its centroid.
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Two horizontal plates are placed 1.25 cm apart, the space between them being filled with oil of viscosity 14 poises. Calculate the shear stress in oil if upper plate is moved with a velocity of 2.5 m/s.
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What is meant by stability of a floating body? Explain the stability of a floating body with reference to its metacentric height. Give neat sketches.
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Differentiate between: i) stream function and velocity function ii) Rotational and irrotational flows.
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An open circular tank of 20 cm diameter and 100 cm long contains water upto a height of 60 cm. The tank is rotated bout its vertical axis at 300 r.p.m., find the depth of parabola formed at the free surface of water.
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What is pitot-tube? How will you determine the velocity at any point with the help of pitot-tube?
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A 0.25 m diameter pipe carries oil of specific gravity 0.8 at the rate of 120 litres per second and the pressure at a point A is 19.62 kN/m2 (gage). If the point A is 3.5 m above the datum line, calculate the total energy at point A in metres of oil.
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A pipe 300 m long has a slope of 1 in 100 and tapers from 1.2 m diameter at the high end to 0.6 m diameter at the low end. Quantity of water flowing is 5400 litres per minute. If the pressure at the high end is 68.67 kPa, find the pressure at the low end. Neglect losses.
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Derive an equation for head loss in pipes due to friction by using Darcy formula and Chezy’s formula.
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Explain the phenomenon of water hammer. Obtain the expression for the rise of pressure when the flowing water in a pipe is brought to rest by closing the valve gradually.
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Explain the characteristics of laminar and turbulent boundary layer.
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A smooth two-dimensional flat plate is exposed to a wind velocity of 100 km per hour. If laminar boundary layer exists upto a value of Rex equal to 3×105, find the maximum distance upto which laminar boundary layer persists, and find its maximum thickness. Assume kinematic viscosity of air as 1.49×10-5 m2/s.
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Obtain Von Karman momentum integral equation.
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