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Posted By: Sree.... Member Level: Diamond Posted Date: 14 Mar 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech MECHANICS OF FLUIDS(R05) Set No. 2 Question paper
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Code No: R05220302 Set No. 2
II B.Tech II Semester Regular Examinations, Apr/May 2007
MECHANICS OF FLUIDS
( Common to Mechanical Engineering, Metallurgy & Material Technology
and Automobile Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Calculate the specific weight, specific mass, specific volume and specific gravity
of a liquid having a volume of 6 m3 and weight of 44 kN.
(b) Distinguish between simple manometer and a differential manometer. [8+8]
2. (a) If f=3xy, find x and y components of velocity at (1,3) and (3,3). Determine
the discharge passing between streamlines passing through these points.
(b) Define one-dimensional, two-dimensional and three-dimensional flows? [10+6]
3. (a) What is kinetic energy correction factor?
(b) The water is flowing through a taper pipe of length 100m having diameters
600mm at the upper end and 300mm at the lower end, at the rate of 50 lit/
s. The pipe has a slope of 1 in 30. Find the pressure at the lower end if the
pressure at the upper end is 19.62N/c m2 [7+9]
4. (a) Define the scale ratio in distorted models and obtain the expression of scale
ratio for velocity and scale ratio for area of flow.
(b) The rate of flow in a 120mm diameter pipe is measured with a venturimeter
with a 40mm diameter throat. When a mercury manometer is connected
across the converging section reads 7mm, the flow rate is 1.5kg/sec. What is
the coefficient of discharge at that flow rate and what is permanent loss of
head? (Specific gravity of mercury =13.6). [7+9]
5. (a) Explain with a neat sketch the boundary layer characteristics when a fluid is
flowing over a flat plate.
(b) A thin flat plate 0.3 m wide and 0.6 m long is suspended and exposed parallel
to air flowing with a velocity of 3 m/sec. Calculate drag force on both sides
of the plate when the 0.3 m edge is oriented parallel to free stream. Consider
flow to be laminar and assume for air kinematic viscosity is 0.18 stokes and
density is 1.2 kg/m3. [10+6]
6. A pipeline ABC 180 m long is laid on an upward slope of 1 in 60. The length of
portion AB is 90 m and its diameter is 0.15 m. At B the pipe section suddenly
enlarges to 0.30 m diameter and remains so for the remainder of its length BC, 90
m. A flow of 50 litres per second is pumped into the pipe at its lower end A and is
discharged at the upper end C into a closed tank. The pressure at the supply end
A is 137.34 kN/m2. Sketch [16]
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Code No: R05220302 Set No. 2
(a) the total energy line
(b) the hydraulic gradient line and also find the pressure at discharge end C. Take
f = 0.02 in hf= flV 2
2gD
7. (a) Show that the momentum correction factor for laminar flow through a circular
pipe is equal to 4/3.
(b) A shaft having a diameter of 50mm rotates centrally in a journal bearing hav-
ing a diameter of 50.15 mm and length 100mm. The annular space between
the shaft and the bearing is filled with oil having viscosity of 0.9 poise. Deter-
mine the power absorbed in the bearing when the speed of rotation is 60 rpm
[8+8]
8. (a) What is meant by co-efficient of compressibility ?
(b) A diffuser of area 2:1 operates at the inlet conditions P1 =500KN/m2, T1
=500K, Mach number M1=0.6, K=1.4. Estimate the following at the exit
[8+8]
i. Velocity
ii. pressure
iii. Temperature
iv. Mach number.
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