Total No. of Questions 12]
[Total No. of Pages 3
[5353] 105
T.E. (Civil) (End Sem.)
FLUID MECHANICS II
(2012 Pattern)
Time :2.½ hours] [Max. Marks :70
Instructions to the candidates:
Neat diagrams must be drawn wherever necessary.
Figures to the right indicate full marks.
Use of logarithmic tables, slide rule, mollier charts electronic pocket
calculator and steam tables is allowed.
Assume suitable data, if necessary.
Answer 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
P3242
SEAT No.
P.T.O.
[5353] 105 2
Q5) A maximum discharging trapezoidal channel of best section has a depth of
2.1 m and fall of 1:2680. Calculate the discharge and draw a section of channel
with side of 1:1.
OR
Q6) Derive the following expression for the loss of energy of hydraulic jump in
horizontal rectangular channel.
3
2 1
1 2
E
4
y y
y y
−
Δ
Q7) Derive expression for the "work done by the jet" in case of flat plate
inclined and moving in the direction of jet.
Draw neat labeled sketch of a Centrifugal pump and Also explain its
working.
A centrifugal pump with 1 .25m diameter runs at 210 rpm and pumps
1890 lit/sec, the average lift being 6. 1 m. The angle which the vane
makes at exit with the tangent to the impeller is 27° and the radial velocity
of flow is 2.6 m/s. Determine the manometric efficiency and the least
speed to start the pumping against the head of 6.lm, the inner diameter of
the impeller being 0.6m.
OR
Q8) Explain the working of "reciprocating pump" with neat sketch.
Explain in brief with neat sketches "types of impellers" related with
centrifugal pump.
A 8.5 cm diameter jet having a velocity of 27m/s strikes a flat plate, the
normal of which is inclined at 45° to the axis of jet. Find the normal
pressure on the plate:
When the plate is stationary.
ii) When the plate is moving with velocity of 14 m/s away from the jet.
Also determine the power and the efficiency of the jet when the plate is
moving.
Q9) Draw the neat sketch of hydroelectric power plant. Explain various
elements of it.
Define specific speed. Derive the expression for the same.
[5353] 105 3
OR
Q10)a) Differentiate between Reaction turbine and Impulse turbine
ii) Explain the "Governing of turbine"
A Pelton wheel is to be designed for head of 70m when running at 210
rpm. The Pelton wheel develops 95.80 kW shaft power. The velocity of
bucket is 0.46 times the velocity of jet, overall efficiency=86% and
coefficient of velocity is equal to 0.98.
Q11)a) Derive the following equation of GVF with usual notations. State also
the assumptions made for it.
1 2
o f dy S S
dx Fr
−

−
A rectangular channel 8m wide carries a discharge of 11m3/s (Manning's
n 0.025 and bed slope of 0.0016). Compute the length of back water
profile created by a dam which backs up a depth of 2 m immediately
behind the dam by direct step method. Take at least 3 steps to compute
the profile.
OR
Q12)a) Describe with neat sketches the following:
Classification of channel bottom slopes
ii) Classification of water surface profiles
A rectangular channel 7.6 m wide has a uniform depth of flow of 2.1 m
and has bed slope of 1 in 3000. If due to weir constructed at the
downstream end of the channel, water surface at a section is raised by
0.76 determine the water surface slope with respect to horizontal at
this section. Take Manning's n 0.02.