CE6303 MECHANICS
OF FLUIDS, Second year, Department of Civil Engineering, Model Exam
Questions.
Answer ALL QuestionsPART A – (10 x 2 = 20 Mark )
1.
Define
viscosity?
2.
Write
down the expression for capillary rise?
3.
State
Bernouillie’s equation?
4.
Define
stream function?
5.
What
are the characteristics of laminar flow?
6.
List
major and minor losses of flow in a pipe?
7.
Define
momentum thickness?
8.
Draw
the diagram for drag force on a plate due to boundary layer?
9.
Define
dimensions analysis?
10.
List
out the advantages of velocity?
PART
–B (5x16=80 marks)
11. (a) Thedynamic viscosity of a oil used for
lubrication between a sharp and a sleeve of poise the shaft is a diameter of
0.4m and rotate at 180rpm .calculate the power lossed in the bearing for a
sleeve length of 90mm. thickness of the oil film is 1.5mm. (16)
(OR)
11. (b)Ifthe velocity profile of a fluid over a
plate is a parabolic with a vertex 20cm from the plate where the velocity is
120cm/s . calculate the velocity gradient and shear stresses at a distance of
0,10,20 cm from the plate. If the viscosity of the fluid is 8.5 poise. (16)
12. (a)Avertical sluice gate is used to cover
and opening in a dam. The opening is 2m wide and 1.2m height. On the upstream
of the gate,the liquid of specific gravity
1.45 lies upto a
height of 1.4m above the top of the gate where as on the down stream side the
water is available upto height touching the top of the gate. Find the resultant
force acting on the gate and position of centre of pressure. Find also the force
acting horizontally at the top of the gate which is capable of opening it.
Assume that the gate is hinged at the bottom. (16)
(OR)
12.(b)A rectangular plane surface 2m wide and
3m deep lies in water in such a way that its plane makes an angle of 30degree
with the free surface of water. Determine the total pressure and position of
centre of pressure when the upper edge is 1.5m below the free water. (16)
13. (a)Find the head
lost dut to friction in a pipe of diameter 300mm and length 50m through which
water is flowing at a velocity of 3m/s using i)chazy’s formula for which
c=60(16)
(OR)
13.(b)Explain Euler’s equation of motion. (16)
14. (a)Find the
displacement thickness for the velocity distribution in the boundary layer
given by u/U=2(y/Ïš)-(y/Ïš)2. (16)
(OR)
14.(b)Explain force on a flat plate due to
boundary layer. (16)
15. (a)Explain buckingham’s theorem. (16)
(OR)
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