Hall Ticket No Question Paper Code: AAE003
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
Four Year B.Tech III Semester End Examinations (Supplementary) July, 2018
Regulation: IARE R16
FLUID MECHANICS AND HYDRAULICS
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Define and explain Newtons law of viscosity.
Two horizontal plates are placed 1.25 cm apart, the space between them being filled with oil of
viscosity 14 poises. Calculate the shear stress in oil if upper plate is moved with a velocity of 2.5
m/s.
2. State and prove Pascal's law in fluid mechanics.
A rectangular plane surface 3 m wide and 4 m deep lies in water in such a way that its plane
makes an angle of 300 with the free surface of water. Determine the total pressure force and
position of center of pressure, when the upper edge is 2 m below the free surface
UNIT II
3. A rectangular plate 3 meters long and 1 m wide is immersed vertically in water in such a way
that its 3 meters side is parallel to the water surface and is 1m below it. Find
i. Total pressure on the plate
ii. Position of center of pressure.
Define Stream line, Path line and Streak line with neat sketches.
4. A vertical cylinder 300mm in diameter is fitted at the top with a tight but frictionless piston and
filled with water at 700 C. The outer portion of the piston is exposed to atmospheric pressure of
101.3 kPa. Calculate the minimum force applied on the piston that will cause water to boil at
700 C. Take Vapor pressure of water at 700 C as 32k Pa.
Figure 1
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Water is flowing through a pipe of diameter 5cm under a pressure of 29.43N/cm2 (gauge) andwith
mean velocity of 2 m/s. Find the total energy per unit weight of the water at a cross-section,which
is 5m above the datum line.
UNIT III
5. Differentiate between forced vortex and free vortex flow.
A open circular tank of 20 cm diameter and 100 cm long contains water up to a height of 60 cm.
The tank is rotated about its vertical axis at 300 rpm., find the depth of parabola formed at the
free surface of water.
6. State and derive Buckingham's theorem.
Define Reynold's number and Froude's numbers. Derive expressions for these numbers.
UNIT IV
7. What is meant by boundary layer? Why does it increase with distance from the upstream edge?

Explain Reynolds's experiment with neat sketch.
8. Define: laminar boundary layer, turbulent boundary layer, laminar sub layer and boundary layer
thickness.
An oil of viscosity 10 poise flows between two parallel plates which are kept at distance of 50 mm
apart. Find the rate of flow of oil between the plates if the drop of pressure in a length of 1.2 m
be 0.3 N/cm2. The width of the plates is 200 mm.
UNIT V
9. Classify the fluid machine types with suitable examples.
Derive and explain Impulse momentum Equation Momentum Equation
10. Write the equation for Euler turbo machine?
Explain boundary layer characteristics. Derive the expression for boundary layer thickness.