JNTU
JNTU B.Tech II MECHANICS OF FLUIDS Previous Question Paper (March - 2022 - R13)
Answer any five questions. All questions carry equal marks.
Main
Explain how vacuum pressure can be measured with the help of a U-tube manometer.
Answer
A U-tube manometer measures vacuum pressure by connecting one limb to the point where the pressure is to be measured, while the other limb remains open to the atmosphere. When the pressure at the point is below atmospheric, the liquid in the limb connected to the point rises above the level in the open limb. If the initial level of the manometer liquid is at the same height in both limbs, the vacuum pressure is calculated as the product of the specific weight of the manometer liquid and the difference in height between the two limbs. The formula is
Find the pressure inside a water droplet of diameter 0.03mm, if the surface tension of water is 0.075N/m.
Answer
For a water droplet, the pressure intensity is given by the formula
Find the intensity of pressure at a depth of 2m in a liquid of specific gravity 0.8.
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In a mercury differential manometer the mercury deflection is 20 cm. Find the difference of pressure in kpa if the liquid flowing in the pipe is oil of specific gravity 0.8.
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Differentiate between: i) Absolute pressure and gauge pressure ii) Piezometer and simple manometer.
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Show the stream lines and equipotential lines intersect each other orthogonally.
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The velocity components in a two-dimensional flow field for an incompressible fluid are expressed as
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What do you mean by one and two-dimensional flow?
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What is line of constant stream function?
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What are velocity potential and stream function?
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State Buckingham pi-theorem.
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A horizontal venturimeter with inlet diameter 20cm and throat diameter 10cm is used to measure the flow of oil of specific gravity 0.9. The discharge of oil through venturimeter is 80 liters/sec. find the reading oil mercury differential manometer. Take Cd = 0.98.
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Derive Bernoulli’s equation for the flow of an incompressible frictionless fluid from consideration of momentum.
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Define and explain about the Buckingham’s π - theorem.
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Recommend the boundary conditions for the velocity profiles.
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Show the Moody’s chart schematically and explain its significance.
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Describe Darcy formula. How will you interpret the loss of head due to friction in pipes?
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