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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

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

Max. Marks: 100 Duration: 3 Hours
PART A
Answer any three full questions, each carries 10 marks Marks
1 a) Explain technical reason for the following: (4)

i) Certain insects are able to walk on surface of water. ii)
Rise of water in trees
b) A U-tube differential mercury manometer is connected between two pipes > and ४. (6)
Pipe X contains a fluid (Sp.gr. = 1.59) under a pressure of 103 kKN/m? and pipe Y contains oil
(Sp.gr. = 0.8) under a pressure of 172 kN/m?. Pipe X is 2.5 m above pipe Y. The mercury level
in the limb connected to pipe X is 1.5 m below the centreline of pipe Y. The level of mercury in
the limb connected to pipe Y is below the level of mercury (Sp.gr. = 13.6) in the other limb. Find
the manometer reading in centimetres of mercury and show the same as a schematic diagram.

2 a) State and explain the Newton’s law of viscosity. Explain with examples the (4) classification
of fluids on the basis of this law.
b) A vertical rectangular gate of 4m width and 2m depth is hinged ೩! a point 0.25 7 (6)
below the centre of gravity of the gate. If the top edge of gate is 5 m below free surface
of water and total depth of water is 7 m, what horizontal force must be applied at the
bottom to keep the gate closed?

3 Distinguish between: (10)
i) Steady flow and unsteady flow ii) Uniform flow and non-uniform flow
iii) Rotational and irrotational flow iv) Laminar flow and Turbulent flow
4 a) Describe the following terms: (4)
1) Stream lines 11) Path lines iii) Streak lines iv) Stream tubes.
b) (6)

A velocity field is defined by ர்‌ Compute the velocity, local acceleration and convective
acceleration at point (1, 2, 0). ۷ - ‏مرك‎ + ठप +0

PART ந
Answer any three full questions, each carries 10 marks
5 a) Compare Venturimeter and orifice meter with respect to construction, principle, merits and (4)
demerits.
b) A Venturimeter whose throat diameter is 1/3" of pipe diameter is fitted in a horizontal pipe (6)
of 300 mm diameter carrying water. The pressure in pipe line is 13.8 N/cm? (gauge)
and vacuum in throat is 37.5 cm of mercury. Determine the rate of flow through the
pipeline. Take Ca=0.98.

6 a) Comparerectangular notch and triangular notch with respect to construction and (4)
advantages.
b) Explain the working principle of Pitot tube and Pitot-static tube with neat sketches. (6)

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