B.Tech II Year I Semester Examinations, November - 2023

FLUID MECHANICS

(Civil Engineering)

Time: 3 hours

Max. Marks: 70

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Note: 1. Question paper consists of three parts A, B and C.

2. Answer one question from each part in Part A and B. Each question carries 14 marks.

3. Part C is compulsory and consists of 10 short answer questions carrying 2 marks each.

PART – A

1. a) Define the following terms:

   1. Real fluid

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   2. Newtonian fluid
   3. Non-Newtonian fluid
   4. Ideal fluid.

   b) A 90 N rectangular block slides down a lubricated inclined plane making an angle of 25° with the horizontal. The rectangular block is 30 cm wide and 45 cm long. The thickness of the oil film is 0.025 cm. If the viscosity of the oil is 0.1 poise, find the terminal velocity of the block.

   (7+7 Marks)

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   OR

2. a) State and prove Pascal’s law.

   b) A circular plate 3.0 m diameter is submerged in water in such a way that its greatest and least depths below the free surface are 4 m and 1.5 m respectively. Determine:

   1. Total pressure on one face of the plate

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   2. The location of the centre of pressure.

   (7+7 Marks)

PART – B

3. a) Derive the continuity equation for three-dimensional flow in Cartesian coordinates.

   b) A stream function is given by ? = 5x – 6y. Calculate the velocity components and also magnitude and direction of the resultant velocity at any point.

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   (7+7 Marks)

   OR

4. a) What are the energy correction factor and momentum correction factor? Explain.

   b) Water is flowing through a pipe of 20 cm diameter and 30 m length with a velocity of 2.5 m/s. Find the head lost due to friction using:

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   1. Darcy’s formula
   2. Chezy’s formula for which C = 55.

   (7+7 Marks)

PART – C

5. Answer all the following short questions.

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   1. Define specific gravity and specific volume.
   2. What do you mean by surface tension?
   3. Define gauge pressure and absolute pressure.
   4. Define total hydrostatic pressure and centre of pressure.
   5. Define velocity potential function and stream function.

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   6. Define stream line and path line.
   7. Define laminar flow and turbulent flow.
   8. What is meant by boundary layer separation?
   9. Define HGL and TEL.
   10. What is a pitot tube?

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   (10 x 2 = 20 Marks)

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