# Andhra University BE/B.Tech Mechanical Engineering Fluid Mechanics – 2012 Previous Paper

[03-2310]

1.(a) What is pressure center ?

(b) What are the applications of curved surfaces ?

(c) Distinguish between Eulers’ equation Bernoulli’s Equation

(d) What do u understand by navier stoke’s equations ?

(e) What is the importance of dimensionless numbers?

(f) Explain pitot tube ?

(g) State the limits of incompressibility?

2.(a) Explain reynoldas number and its significance in detailed.What is the significance of upper and lower critical Reynolds numbers?

(b) A viscous fluid of Viscosity 2.2 poise and specific gravity 1.4 flows throw a 40 cm diameter pipe if the loss of head is 3m is in 100 m length .Determine the shear stress at the wall pipe and velocity of flow assuming the flow to be laminar

3.(a) State and explain the four types of displacement of the fluid particle that undergoes as it moves in flow field?

(b) For the following flows ,determine the components of rotation about the various access

i. U=xy^{3}z;;v=-y^{2}z^{2}; w =yz^{2} -y^{2}z^{2}/2

ii. U= 3xy; v=3x^{2}/2-3y^{2}/2

iii. U=y^{2};v=-3x

4.(a) What is meant of coefficient of compressibility ?

(b) A diffuser of area ratio 2:1 operates at the inlet condition P_{1}=500kN/m^{2}; T_{1}=500k;m_{1}=0.6;r_{1}.4. Estimate

I. Velocity

II. Pressure

III. Temperatue and

IV. Mach number at the exit.

5.(a) Derive Bernollis’ equation for flow along a stream line.

(b) A pipe 200m long slope down at 1 in 100 and taper from 800mm diameter at the diameter at the higher end to 400 mm diameter at the lower end and carrier 100 lps of oil(s=0.85).If the pressure guage reading at the higher end reads 50 kN/m^{2} determine

I. Velocity at the two ends and

II. Pressure at the lower end neglect losses.

6.(a) Describe the use and limitations of the flow nets

(b) Find the relation between the center of gravity and center of pressure for an inclined surface immersed in a liquid.

7.(a) Explain with sketches, propagation of pressure waves by an object moving in compressible fluid.

(b) An object which has a volume of 0.18 m2 required a force of 265N to keep immersed in water .If a force of 157N is required to keep it immersed in other liquid , find the specific gravity of the liquid.

8.Write notes on:

(a) Dimensionalness groups

(b) Stagnation properties and

(c) Hagen Poiseulle flow

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