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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017

Course Code: ME203
Course Name: MECHANICS OF FLUIDS (ME)

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 93) Differentiate between ideal fluids and real fluids. Mark those on rheological (4)
diagram.

b) A plate weighing 15014 and measuring 0.8mx0.8m slides down an inclined plane (6)
over an oil film of 1.2mm thickness for an inclination of 30° and a velocity of 0.2m/s.
Compute the dynamic viscosity of the fluid.
2 a) What is metacentre? Explain the equilibrium conditions of floating bodies. (4) b) A triangular
plate of base width 2m and height 3m is immersed in water with its (6)
plane making an angle of 60° with the free surface of water. Determine the
hydrostatic pressure force and the centre of pressure when the apex of the triangle
lies 5m below the free water surface.
3 a) Explain the working principle and use of the following devices. (6)
i) Hydraulic lift ii) Piezometer iii) Bourden tube pressure gauge
b) Differentiate between rotational and irrotational fluid flow. (4)
4 a) Define the following with example. (4)
1) Stream lines ii) Stream tube 111) Path lines iv) Streak lines

b) The stream function for a flow field is given by ۷ = 2xy. Check whether the flow is

(6) continuous or irrotational.
PART ந
Answer any three full questions, each carries 10marks.
5 9) Derive Euler’s equation of motion. Obtain Bernouli’s equation from Euler’s (6)
equation.
b) What are the applications and limitations of Bernouli’s equation? (4) 6 a) What is
Venturimeter? Derive an expression for discharge through a venturimeter. (6) b) Water
flows at the rate of 15litre/s through a pipe 100mm diameter orifice used in a (4) 200
mm diameter pipe. What is the difference of pressure head between upstream section
and vena contracta section? Take coefficient of contraction as 0.6 and
coefficient of velocity as 1.

7 a) Differentiate between laminar and turbulent flows. (4)
b) Derive Darcy- Weisbach equation. (6)
8 a) Explain the causes of major and minor energy losses in pipe flows. (4)

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