Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2018-19 NCE 052 Analysis And Design Of Hydraulic Structures Question Paper
Printed Pa_es: 03 Sub Code: NCE 052
Paperld=? RouNo.I | | | I I I I I I I
B. TECH.
(SEM VIII) THEORY EXAMINATION 2018-19
ANALYSIS AND DESIGN OF HYDRAULIC STRUCTURES
Time: 3 Hours Total Marks: 100
Note: 1. Attempt all Sections. If you require any missing data, choose suitably.
SECTION A
1. Describe the following brief. 2 x 10 = 20
a. Regulation work
b. Bed bars
0. Syphon aqueduct
d. Silt excluder
e. Flood routing
f. Demand curve
g. Keys
h. Water stops
i. Controlled spillway
j. Surge tank
SECTION B
2. Attempt any three of the following: 10 x 3 = 30
a. De?ne canal fall. What are the factors considered to decide the location of fall?
b. The concrete ?oor of a head regulator is level with the channel bed (except for the
short crest hump) and is 13 m long. The ?oor is provided with cutoff usually at its
upstream and downstream ends. The depth of upstream cutoff is 1.5 m (below the
?oor level) and that the downstream wall is 2 m. Using Khosla?s theory (See Fig. l
for definition sketch and formula) determine the thickness of the ?oor at its mid
length and also at its junction with upstream and downstream cutoff walls. The ?oor
thickness may not be less than 30 cm anywhere. The upstream FSL is 1.5 m above
the ?oor level. If the permissible exit gradient is 0.18, is the ?oor safe against failure
by piping?
a=b/d
2 ?2 \/ 2
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c. Explaln d1V1de wall and 1ts functlons. What are the condltlons of deSIgnlng d1V1de
wall?
(1. Define gallery. What are the purpose for providing gallery in dam?
e. Classify hydroelectric scheme and explain them elaborately. Three turbo?
generators each of capacity 10000 kW have been installed at a hydel power station.
During a certain period of load, the load on the plant varies from 12000 kW to 26000
kW. Calculate (1) total installed capacity, (ii) load factor, (iii) plant factor and (iv)
utilization factor.
SECTION C
3. Attempt any one part of the following: 10 x 1 = 10
(a) An impervious ?oor of a weir 0n permeable soil is 16 m long and has sheet
piles at both the ends. The upstream pile is 4 m deep and the downstream pile is 5
m deep. The weir creates a net head of 2.5 m. Neglecting the thickness of the weir
?oor, calculate the uplift pressures at the junction of the inner faces of the pile
with the weir ?oor, by using Khosla?s theory.
(b) Define weir and its component parts with a neat sketch. What are the causes of
failure of weirs?
4. Attempt any one part of the following: 10 x 1 = 10
(a) Design a vertical drop weir on Bligh?s theory for the following site conditions:
(1) Maximum ?ood discharge: 28000 cumecs
(ii) H.F.L. before constructions = 285.0 m
(iii)Minimum water level = d/s bed level = 278.0 m
(iV)F.S.L. of canal = 284.0 m
(V) Allowable af?ux = 1 m
(Vi) Coefficient of creep = 12
(Vii)Permissible exit gradient = 1/6
Assume any other data not given. Perform Hydraulic calculation, wear wall design
and design of impervious ?oor only.
(b) Define cross?drainage work and classify it. What points should be considered
while selecting the site of a cross?drainage work?
5. Attempt any one part of the following: 10 x 1 = 10
(a) Classify reservoirs. What are the different investigations for reservoir planning?
Name the zones of storage in reservoir.
(b) What are the different types of earth dams? Explain the causes of failure of earth
dams.
6. Attempt any one part of the following: 10 x 1 = 10
(a) A masonry dam 10 m high is trapezoidal in section with a top width of 1 m and
bottom width of 8.25 m. The face exposed to water has a batter 1:10. Test the
stability of the dam. Find out the principal stresses at the toe and heel of the dam.
Assume unit weight of masonry as 22.4 kN/m3, unit weight of water = 9.81 kN/m3
and permissible shear stress ofjoint = 1400 kN/mz.
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(b) (1) ClaSSIfy Jomts and explaln them elaborately.
(ii) How can we control the cracking in concrete dams?
7. Attempt any one part of the following: 10 x 1 = 10
(a) Explain brie?y the components parts of spillways and classify spillways based
on purpose. What are the factors affecting the required spillway capacity?
(b) Design an ogee spillway for concrete gravity dam, for the following data:
(1) Average river bed level = 250.00 In
(ii) R.L. of spillway crest = 350.00 In
(iii) Slope of d/s face of gravity
dam = 0.75:1
(iv) Design discharge = 6500 cumecs
(V) Length of each pier = 5 spans with a clear length of 9 m each
(Vi) Thickness of each pier = 2 m
Assume Cd = 2.2.
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This post was last modified on 30 January 2020