C C192031 Pages:2

Reg No.:_ Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION(R&S), DECEMBER 2019

Course Code: ME203
Course Name: MECHANICS OF FLUIDS

Max. Marks: 100 Duration: 3 Hours
PARTA

Answer any three full questions, each carries 10marks. Marks

1 A U - Tube manometer is used to measure the pressure of water in a pipe line, (10)

which is in excess of atmospheric pressure. The right limb of the manometer
contains mercury and the contact between water and mercury is in the left limb.
Determine the pressure of water in the main line, if the difference in level of
mercury in the limbs of U tube is 10 cm and the free surface of mercury is in
level with over the centre of the pipe. If the pressure of water in pipe line is
reduced to 9810 N/m’, calculate the new difference in the level of mercury.
Sketch the arrangement in both cases.

2 98) Differentiate between (5)
i. Absolute and gauge pressure
11. Piezometer and pressure gauges

b) An open tank contains water up to a depth of 2m and above it an oil of specific (5)
gravity 0.9 for a depth of Im. Find the pressure intensity

i. At the interface of the two liquids
11. At the bottom of the tank
3 Differentiate the following. (10)

(a) Lagrangian method and Eulerian method
(b) Steady and unsteady flow

(c) Laminar and turbulent flow

(d) Stream line and streak line flow.

4 An idealized flow is given by V = 2531 - 30൮). Is the flow steady or unsteady ? (10)
Is it 2D or 3D ?Make calculations for the velocity, local acceleration and
convective acceleration of a fluid particle in the flow field at the point (2,1,3).

PART B
Answer any three full questions, each carries 10marks.
೨ Derive Darcy -Weisbach equation for head loss due to friction. (10)
6 A pipe carrying water has a 30 cm x 15 cm venturimeter which is positioned (10)

inclined at 30° to the horizontal, the flow being upwards. The converging cone is
45 cm in length and the co-efficient of discharge of the meter is 0.98. A
differential U tube manometer with mercury as indicating fluid is connected to
the inlet and to the throat and shows a differential column height of 30 cm.
Calculate the discharge in the pipe
If the pressure at inlet section is 50 kPa, determine the pressure at the throat.
And the head loss in the converging section of the venturimeter.
7 Water is flowing through a taper pipe of length 100 mm having diameters 600 (10)
mm at the upper end and 300 mm at the lower end, at the rate of 50 liters/s. The

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