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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018
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 Differentiate the following (10)
(a) Newtonian and Non Newtonian fluid.
(b) Compressible and incompressible fluid.
(c) Ideal and real fluid.
(d) Specific weight and Specific Gravity

2 A rectangular pontoon 10m long 7 m broad & 2.5m deep weights 686.7KN. It (10) carries
on its upper deck an empty boiler of 5 m diameter weighing 588.6 KN. The centre of gravity
of the boiler and the pontoon are at their respective centers along a vertical line. Find the
metacentric height and check the stability of the body. Weight density of sea water is 10.104
KN/m?

3 Define the following terms (10) i. Stream line 11. Streak line 111. Path line iv. Stream tube

4 The velocity vector in a fluid flow is given by ۷ = ‏ز4‎ - 10x*yj + 2tk. Find the (10) velocity
and acceleration of a fluid particle at (2,1,3) at time t = 1.

PART B Answer any three full
questions, each carries 10 marks.

5 Find the head loss due to friction in a pipe of diameter 250mm and length 60m, (10) through
which water is flowing at a velocity of 3m/s, using (i) Darcy’s formula and (ii) Chezy’s
formula for which C = 55 and kinematic viscosity = 0.1 stoke.

6 A submarine moves horizontally in sea and has its axis below the water surface. (10) A pitot

tube is placed in front of the submarine along its axis is connected to the two limbs of a U-
tube containing mercury. The difference in mercury level is found to be 170 mm. Find the
speed of submarine in km/hr, knowing that specific gravity of sea water is 1.025.

Explain briefly major and minor losses in pipe lines. (10)

8 Derive Euler’s equation and hence deduce the expression for Bernoulli’s Equation. State (10)

the assumptions made for such derivation.

PART 0
Answer any four full questions, each carries 10 marks.

Define momentum thickness. Derive an expression for momentum thickness. (10)

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