Anna University,
Chennai Nov/Dec 2012 Examinations

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Important Questions

ME2204/Fluid Mechanics and Machinery

III Sem MECH

Unit I-V

1.
State the law of conservation of energy and derive the
Bernoulli’s equation for an incompressible fluid and Derive
the Bernoulli’s energy equation and state the assumptions made while deriving
the equation

2.
A pipe of 300 mm diameter inclined at 30o to the horizontal
is carrying gasoline (specific gravity = 0.82). A venturimeter is fitted in the
pipe to find out the flow rate whose throat diameter is 150mm. The throat is
1.2m from the entrance along its length. The pressure gauges fitted to the
venturimeter read 140kN/m2 and 80kN/m2 respectively. Find out the coefficient
of discharge of the venturimeter if the flow is 0.20 m2/s.

3.
Explain in detail the Newton’s law of viscosity and the types
of viscosity. Briefly classify the fluids based on the density and viscosity.
Give the limitations of applicability of Newton’s law of viscosity.

4.
Explain in detail the Newton’s law of viscosity and the types
of viscosity. Briefly classify the fluids based on the density and viscosity.
Give the limitations of applicability of Newton’s law of viscosity.

5.
Derive the equations for velocity distribution and shear
stress distribution for laminar flow.

6.
Derive Darcy’s equation for head loss of head due friction in
pipe

7.
For a town water supply, a main pipe line of diameter 0.4m is
required. As pipes more than 0.35m diameter are not readily available, two
parallel pipes of same diameter are used for water supply. If the total
discharge in the parallel pipes is same as in the single main pipe, find the
diameter of parallel pipe. Assume the coefficient of discharge to be the same
for all the pipes

8.
Derive the expression for loss of head due to friction in
pipes – Darcy Weisbach equation. What is its application?

9.
The power developed by hydraulic machines is
found to depend on the head h, flow rate Q, density ? , speed N, runner
diameter D, and acceleration due to gravity g. Obtain suitable dimensionless parameters to correlate
experimental results.

10.
using Buckingham's ? theorem, show that the velocity through
a circular orifice in a pipe is given by v = 2gH f {d/H,µ /? vH} where v is the
velocity through orifice of diameter d and H is the head causing the flow and ?
and µ are the density and dynamic viscosity of the fluid passing through the
orifice and g is acceleration due to gravity.

11.Explain the Reynold’s model
and Euler’s model
with suitable examples

12.
using dimensional analysis, obtain a correlation for the frictional torque due to rotation of a disc
in a viscous fluid. The parameters influencing the torque can be identified as the diameter, rotational speed, viscosity and
density of the fluid.

13.Explain the working principle of
Kaplan turbine

14.
Describe
the working
principle
of vane
pump,gear
pump,reciprocating
pump, positive displacement pumps
in detail

15.
Compare
the advantages and disadvantages of centrifugal submersible and jet pumps(see
related problem)

16.
With a neat sketch explain the working of
double acting reciprocating pump with its performance characteristics