Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 4th Semester (Fourth Semester) 2015-16 NCE 403 Hydraulics Hydraulic Machines Question Paper
(Following Paper ID and Roll No. to be ?lled in your
Answer Books)
Roll No
B.TECH.
Theory Examination (Seinmter-IV) 2015-16
HYDRAULICS & HYDRAULIC MACHINES
Time : 3 Hours Max. Marks : 100
Section?A
Attempt all parts. All parts carry equal marks.
Q.l. Write answer of each part in short. (2X10=20)
(a) De?ne open channel ?ow with example.
(b) Describe speci?c energy?
(c) State the relation between Manning's constant and
ChezY's constant
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(d)
(e)
(f)
(g)
(h)
(i)
6)
Sketch the velocity distribution in rectangular and trian-
gular channels.
Classify the surface pro?les in channels
.List the assumption made in the den'vation of dynamic
equation of gradually varied ?ow.
Hydxaulic jump is sometimes used as energy dissipator
at the toe of the spillway of a dam. why?
What is meant by Cavitations?
De?ne celen'ty of the surge
Give the range of speci?c speed values of Kaplan.
Francis turbine and peltonwheels.
Section-B
Q 2. Attempt any 5 questions from this section. (10X5=50)
(a) Classify the following open?channel ?ow situations:
(a) Flow from a sluice gate
(2)
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(b)
(C)
(d)
(b) Flow in a main irrigation canal
(c) A river during ?ood
Show that in rectangular channel maximum discharges
occurs when the ?ow is critical for a given value of
speci?c eneigy.
Derive an expression for the dischalge through a chan-
nel by Chezy's Formula.
The width of a horizontal rectangular channel is reduced
?'om 3.5 m to 2.5 m and the ?oor is raised by 0.25 m
in elevation at a given section At the upstream section,
the depth of ?ow is 2.0 m and the kinetic energy cor-
rection factona is 1.15.1fthedropin?1ewatersm'face
elevation at the contraction is 0.20 m, calculate the dis-
charge if (a) the energy loss is neglected, and (b) the
energy loss is one-tenth of the upstream velocity head.
[The kinetic energy correction factor at the contracted
section may be assumed to beunity].
(e) What is critical depth in open-channel ?ow? For a given
average ?ow velocity, how is it detennined?
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(f)
(h)
Q.3. (a)
A trapezoidal channel B = 3.0 m, m = 1.50, n = 0.025
and S0 = 0.00050 takes off ?oma reservoir with free
inlet. The reservoir elevation is 7.0 m above the channel
bedattheinlet. Calcdatetlledischargein?ieclmnnelby
neglecting enhance losses
Explain the terms :
(i) Uniform Flow in a open channel
(ii) Reaction turbine
A spillway discharges a ?ood ?ow at a rate of 7.75 m3/
s per metre width. At the downstream horizontal apron
the depth of ?ow was found to be 0.50 m. What tail
water depth is needed to form a hydraulic jump? If a
jump is formed, ?nd its (a) type, (b) length, (c) head
loss,(d)energylossasapementage ofthe initialenetgy,
and (e) pro?le.
Section-C
Note: Attempt any 2 questions from this section. (15x2=30)
Draw neat sketches of various shapes of draft tubes.
(5)
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(b)
Q-4- (a)
(b)
In a pelton wheel has a mean bucket speed of 10
m/s. with a jet of water ?owing at the rate of 0.7
m?ls and a head of 30 m. If the buckets de?ects the
jet through an angle of 160? calculate the power
given by water to the runner and hydraulic ef?ciency
of the turbine. Assume the coef?cient of velocity
0.98 (10)
A compound channel is symmetrical in cross section
and has the following geometn'c properties. Main
channel: Trapezoidal cross section, Bottom width =
15.0 111. Side slopes = 1.5 H : IV, Bank full depth =
3.0 m, Manning's coe?icient = 0.03, Longitudinal
slope = 0.0009 Flood plains: Width = 75 111, Side
slope - 1.5 H : IV, Manning's coe?icient = 0.05,
Longitudinal slope = 0.0009. Compute the uniform
?ow discharge for a ?ow with total depth of 4.2 m
by using DCM with either (i) diagonal interface, or
(ii) vertical interface procedures. (12)
A triangular channel with an apex angle of 75? car-
ries a ?ow of 1.2 m3/s at a depth of 0.80 m. Ifthe
bed slope is 0.009, ?nd the roughness coef?cient of
the channel. - (03)
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Q5. (3) There are three main categories of dynamic pumps.
List and de?ne them. (06)
(b) A centrifugal pump is running at 1000 r.p.m. The
outlet vane angle of the impeller is 45? and velocity
of ?ow at outlet is 2.5 m/s. The discharge through the
pump is 2001it/s when the pump is working against
a total head of 20m. If the manometric ef?ciency of
\
the pump is 80%. Determine ;
.,.
(i) Diameter of the impeller (outside diameter)
(ii) Width of the impeller at outlet. (09) [
(6)
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This post was last modified on 29 January 2020