^ C4819 Pages: 2
Reg No.: Name:

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

Course Code: ME200
Course Name: FLUID MECHANICS AND MACHINERY

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three questions, each carries 10 marks. Marks
1 ஐ Define the following: (3)
i) Newton’s law of viscosity 14) Specific weight iii) Ideal fluids.

b) The pressure outside the droplet of water of diameter 0.04mm is 10.32N/cm*
(atmospheric pressure). Calculate the pressure within the droplet if surface tension is (3)
given as 0.0725N/m of water.

c). Calculate the capillary rise or fall in a glass tube of 2.5mm diameter when immersed
vertically in (i) water and (ii) mercury respectively. Take surface tension as
0.0725N/m for water and 0.52N/m for mercury in contact with air. The specific
gravity for mercury is given as 13.6 and angle of contact as 130°

2 ஐ Differentiate between Newtonian and non-Newtonian fluids. (3)

b) Two large plane surfaces are 2.4 cm apart. The space between the surfaces is filled
with glycerine. What force is required to drag a very thin plate of surface area
0.5square metre between the two large plane surfaces at a speed of 0.6m/s, if: a) the
thin plate is in the middle of the two plane surfaces. b) the thin plate is at a distance of
0.8cm from one of the plane surfaces? Take the dynamic viscosity of glycerine as 8.10
×10 Ns/m?.

3 a) Define vacuum, gauge and absolute pressure and plot its relationship. (4)

b) List down the types of mechanical pressure gauges and explain the working principle (6)
of any one with neat sketch.

4 8) Define centre of pressure and centre of buoyancy. (3)

b) AU tube manometer is used to measure the pressure of water in a pipeline, which is in
excess of atmospheric pressure. The right limb of the manometer contains mercury and
is open to atmosphere. 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

(4)

(7)

in the limbs of U-tube is 10cm and the free surface of mercury is in level with the 0
centre of the pipe. If the pressure of water in pipeline is reduced to 9810/5
calculate the new difference in the level of mercury. Sketch the arrangements in both
cases.
PART B
Answer any three questions, each carries 10 marks.
5 8) Derive Euler’s equation of motion and list down the assumptions made in it. (6)
b) List down the major and minor losses in pipes. (4)
6 2) With neat sketches, derive the continuity equation for a 3D flow. (6)
b) Water is flowing through the pipe of diameter 200mm with a velocity of 3m/s. find the
head lost due to friction for a length of 5m if the co-efficient of friction is given by 4
f=0.02+(0.09/R.°*), where R, is Reynolds number. The kinematic viscosity of water = (4)
0.01 stroke.
7 9) List the different methods to prevent the separation of boundary layer. (4)

b) A pitot tube is inserted in a pipe of 300 mm diameter. The static pressure in the pipe is (6)
Page 1of 2