Second year, Department of Mechanical Engineering
First and second Units Questions.
Answer ALL Questions PART
A – (10 x 2 = 20 Marks)
1.
Explain the variation of viscosity with temperature.
2.
Calculate the specific weight and specific gravity of 1
litre of a liquid with a density of 713.5kg/m3 and which weighs 7N.
3.
Differentiate between kinematic viscosity and dynamic
viscosity.
4.
State Newton’s law of viscosity.
5.
State the continuity equation for a 3-D incompressible
fluid flow.
6.
Write the impulse momentum equation.
7.
Explain the term capillarity.
8.
State the use of
venturimeter.
9.
What is orificemeter and mention its basic principle ?
10. Define
surface tension and express its unit.
11.a (i)State the Bernoulli’ s theorem for steady
flow of an incompressible fluid.(8)
ii) Water is flowing through a pipe of
diameter 30 cm and 20cm respectively. The rate of flow through pipe is
35lps.The section 1 is 8m above datum and section 2 is 6m above datum. If the
pressure at section I is 44.5 N/cm2.Find the intensity of pressure
at section 2. (5)
12.
a (i) Derive the continuity equation for a 3-dimensional flow in cartesian
coordinates. (8)
(ii)
The velocity distribution for flow over a flat plate is given by u=3/4y-y2
in which u is the velocity in metre per second at a distance y metre above the
plate. Determine the shear stress at y=0.15m.Take dynamic viscosity of fluid as
8.6 poise. (5)
13. a)
i) Derive the expression for force exerted on the bend.(5)
ii) A liquid of specific gravity 0.85 is flowing through in an inclined
venturimeter of 250mm×115 mm size. The difference of pressures between the main
and throat is measured by a liquid of specific gravity 0.65 contained in a
inverted U-tube which gives a reading of 275mm.If the loss of head between the
main and throat is 0.3 times the kinetic head of the pipe. determine the rate
of flow of liquid. (8)
14.a) i)A
venturimeter is used for the measurement of discharge of water in a horizontal
pipeline.The upstream diameter is 300 mm.The throat is 150 mm diameter and the
pressure difference between inlet and throat is 3 m head of water. If the loss
of head through converging section of the meter is 1/8 th of the throat
velocity head.Calculate the discharge in the pipeline. (8)
ii)Derive Euler’s equation of
motion for flow along a stream line.(5)
15.a) i) A bend in a
pipeline converging water gradually reduces from 700mm to 400mm diameter and
deflects the flow through an angle of 45°.Find the magnitude and direction of
force exerted on the bend, if the velocity of flow at 700mm section is 8m/s and
pressure is 350kN/m2. (8)
ii) A
flat plate of 0.5m2 in area moves through oil between large fixed
parallel planes 150mm apart.The gap between two parallel planes is filled with
oil of kinematic viscosity 0.4×10-4 m2/s, specific
gravity 0.75 and the plate moving with the velocity of 0.8m.s.Calculate the
drag force when (i) the plate is 30mm from one of the planes (ii) the plate is
placed midway between the plates. (5)
PART – B( 1×15=15 Marks)
16. Water flows through a pipe AB of diameter 50mm which is in series
with pipe BC of diameter 75mm in
which velocity is 2 m/s. At pipe C forks and one branch CD is of unknown diameter such that the
velocity is 1.5m/s.The other branch CE
is of diameter 25mm and condition are such that the discharge in the pipe BC divides
o that the discharge in the pipe CD
is equal to two times if discharge in CE.
Calculate (i) discharge in Pipe AB
and CD(ii) velocity in pipe AB and CE.(iii) diameter of pipe CD.
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