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Posted Date: 05 Jan 2009 Posted By: Sunil Reddy Member Level: Platinum
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2007 Jawaharlal Nehru Technological University Aeronautical II B.Tech I Semester Regular Examinations, November 2007 MECHANICS OF FLUIDS Question paper
Code No: R050212102 Set No. 1
II B.Tech I Semester Regular Examinations, November 2007
MECHANICS OF FLUIDS
(Aeronautical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) What is the disadvantage in having very high meta-centric heights for passen-
ger ships?Expalin.
(b) What are mechanical gauges? Name three important mechanical gauges:-
[8+8]
2. (a) The diameter of a pipe at the sections 1-1 and 2-2 are 200 mm and 300 mm
respectively. If the velocity of water flowing through the pipe at section 1-1 is
4 m/s, find;
i. Discharge through the pipe, and
ii. Velocity of water at section 2-2
(b) Define steady, non-steady, uniform and non-uniform flows. [8+8]
3. (a) Derive equation of motion of Free Vertex Flow?
(b) A nozzle of diameter 30mm is fitted to pipe of 60mm diameter. Find the force
exerted by the nozzle on the water, which is flowing through the pipe at the
rate of 4.0m3/minute. [8+8]
4. (a) Discuss the relative merits and demerits of venturimeter with respect to orifice
meter
(b) A rectangular channel 6mts wide carries 2800 lit/sec at the depth of 0.9mts.
What height of a broad crested rectangular weir must be installed to double
the depth? Assume a weir co coefficient as 0.86. [7+9]
5. (a) The velocity distribution in the boundary layer is given by the equation
Determine the displacement thickness and momentum thickness in terms of
the nominal boundary layer thickness d.
(b) Air flows at 10 m/sec past smooth rectangular flat plate 0.3 m wide and 3
m long. Assuming that the turbulence level in the on coming stream is low
and that transition occurs at Rex = 5×105, calculate the ratio of the total
drag when the flow is parallel to the length of the plate to the value when the
flow is parallel to the width. Assume for air kinematic viscosity as 15 ×10-6
m2/sec. [8+8]
6. (a) Derive Darcy-Weisbach equation for loss of head in a pipe.
(b) Two tanks are connected by a 300 mm diameter 1000 m long pipe. Find the
rate of flow if the difference of water level in the tank is 10 m. Take 4f = 0.04
and ignore minor losses. [10+6]
7. (a) Sketch the Reynolds apparatus and explain how the laminar flow can be
demonstrated with the help of this apparatus?
(b) Oil of absolute viscosity 1.5 poise and relative density 0.85 flows through
a 30cm diameter pipe .If the head losses in a 3000M length of a pipe is
20M.estimate the friction factor by assuming the flow to be laminar. [8+8]
8. (a) what is the relation between pressure and density of a compressible fluid for?
i. Isothermal process
ii. Adiabatic process.
(b) A gas is flowing through a horizontal pipe at a temperature of 40C. The
diameter of the pipe is 8cm and at a section I in the pipe, the pressure is
30.3N/cm2 (gauge). The diameter of the pipe changes from 8cm to 4cm at the
section II, where pressure is 20.3N/cm2 (gauge). Find the velocities of the gas
at these sections assuming an isothermal process. Take R=287.14Nm/Kg.K
and atmosphere pressure=10N/ cm2.
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