Monday, November 12, 2012

ME2204/Fluid Mechanics and Machinery Nov/Dec 2012 Anna University Important Questions

Anna University, Chennai Nov/Dec 2012 Examinations
Rejinpaul.com 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,Âµ /? vH} where v is the velocity through orifice of diameter d and H is the head causing the flow and ? and Âµ 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