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May_Jun_2017.pdf-Total No. of Questions :12] [5153]
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Total No. of Questions :12]
[5153] - 505
T.E. (Civil)
FLUID MECHANICS - II
(2012 Pattern) (Semester - I) (End - Sem.)
Time
:
2½ Hours]
[Max. Marks :70
Instructions to the candidates:
1)
Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8, Q.9 or Q.10, Q.11 or Q.12.
2)
Figures to the right indicate full marks.
3)
Assume suitable data if necessary.
P2540
[Total No. of Pages :3
SEAT No. :
Q1)
a)
A circular disc of diameter 3 m is positioned normal to the direction of
flow of wind at 24 m/s. If the coefficient of drag of the disc is 1.06, find
the force required to hold it at rest.
[3]
b)
What are the factors that influence the total drag on the body?
[3]
OR
Q2)
Water is flowing through an elastic pipe of diameter 45 cm, thickness 5 mm
and length 3500 m with a
velocity of 2.2 m/s. A valve is provided at the end of
the pipe. If the valve is suddenly closed, find the rise in pressure. Assume the
Poissons ratio as 0.25, the bulk modulus of water as 2 ×10
9
N/m
2
and the
modulus of elasticity of pipe material 2 × 10
9
N/m
2
.
[6]
Q3)
Derive the Chezys formula for uniform flow in an open channel. List the
factors that affect the Chezys coefficient.
[6]
OR
Q4)
Explain in detail - specific energy diagram with neat sketch.
[6]
P.T.O.
CEGP013091
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CEGP013091
14.141.39.234 09/05/2017 13:43:02 SERVER36
CEGP013091
14.141.39.234 09/05/2017 13:43:02 SERVER36

Page 2
[5153] - 505
2
Q5)
a)
A hydraulic jump occurs
in a wide rectangular channel. the discharge is
13 m
3
/s and the prejump depth of flow is 0. 55 m. Find the postjump
depth of flow.
[3]
b)
Define:
[3]
i)
normal depth
ii)
conveyance
iii)
section factor
OR
Q6)
Determine the efficient section of a trapezoidal channel designed to carry 4.5
m
3
/s
of water. The side slopes of the channel are 1 horizontal to 3 vertical and
the bed slope of the channel is 1 in 2000. Determine the optimum dimensions
of the channel. Assume mannings coefficient n = 0.03.
[6]
Q7)
a)
A jet of water having a velocity of 25 m/s impinging on a curved vane
which is moving in the same direction as that of the jet with a velocity of
8 m/s. The jet makes an angle of 20
o
with the direction of motion of vane
at entry and leaves the vane at an angle of 120
o
. if the water enters and
leaves the vane without shock, find the vane angles at inlet and outlet.
Also, find the work done per second per unti weight of water striking the
vane. Neglect friction.
[10]
b)
Explain the
following terms related to a centrifugal pump:
[8]
i)
Minimum starting speed
ii)
Hydraulic losses
iii)
Cavitation
iv)
N.P.S.H.
OR
CEGP013091
14.141.39.234 09/05/2017 13:43:02 SERVER36
CEGP013091
14.141.39.234 09/05/2017 13:43:02 SERVER36
CEGP013091
14.141.39.234 09/05/2017 13:43:02 SERVER36

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