7th Semester (July-2016) Civil Engineering Question Paper

1. Seventh Semester B.E. Degree Examination, June/Juty 2015
PART - A
Write the differences between water supply pipes and sewers.
Mention the factors affecting quantity of storm water.
Co-efficient oh Area
0.90 l5
Environmental Engineering - ll
Note: Answer FIVE full questions, selecting
at least TWO questioras.from euch parl
f fo-Cv
0.15 2s
0.40 20
0.10
Calculate the Runoff coefficient q,nd quantity of storm water run-off. If intensity of rainfall
is 30mm/h for rain with duration equal to time of concentration. If population density in the
area is 350 person per hectare and rate of water supply is 200.tpcd. Calculate design
discharge for combined system. Take Qp.ur.
: 2. (08 Marks)
2 a. State the hydraulic formulas which are commonly adopted in design of sewers. Explain any
one in brief. (06 Marks)
b. Explain the phenomenon of crown corrosion with the help of neat sketch. How can this be
avoided? (06 Marks)
c. Calculate,the velocity of flow and corresponding discharge in a sewer of circular section
having diameter equal to lm laid at a gradient of 1 in 500. The sever runs at 0.6 depth. Use
mannings formula taking N : 0.012. (08 Marks)
3 d; Mention the classification of trap according to use and location of these traps in house
drainage connections. (06 Marks)
b. Explain various principles that should be kept in mind while designing a house drainage
system. (06 Marks)
c. Briefly explain sewer appurtenances with neat sketch (i) Drop manhole (ii) removes low
density material which affect the growth of aerobic bacteria during treatment process.
(08 Marks)
4 a. Briefly explain the laboratory procedure for determining the BOD of waste water. (08 Marks)
b. The BOD of a sewage incubated for one day at 30'C has been found to be 100mg4. What
USN
10cv71
Max. Marks:100
(06 Marks)
(06 Marks)
(06 Marks)
(06 Marks)
Time: 3 hrs.
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The catchment area is of 300 hetctares. The surface covers in the 6atchment classify as given
below.
Type
Roof
Pavement and Yards 0.80 15
Lawn and garden
Roads
Open ground
Single family dwelling 0.50
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will be the 5 day 20'C BOD? Assume K: 0.12 (Base 10) at 20"C.
c. With the help of neat sketch explain carbon and Nitrogen cycle.
I of2

2. a.Discussfullytheactioninvolved,,ffi*,,,*.ionofNatura1water.
b. What is sewage sickness? How sewage sickness can be prevented?
c. Using the following data find out Do at the end of l't and 2"d day.
10cv71
(06 Marks)
(06 Marks)
(08 Marks)
(20 Marks)
Flow (m3ls)
DO (mgl.t)
River Wastewater
252
9.1 0
5day BOD (mg/l) 2 200
Take deoxygenation constant as 0.1 per day and reoxygenation constant as 0.3 per day. Take
saturation DO as 9.Lmgil (08 Marks)
a. Explain the flow diagram employed for a conventional waste water treatment plant. Indicate
the importance of each unit indicated,in the flow diagram. (06 Marks)
b. Explain the functioning of screens and grit chamber in the treatment of municipal waste
water. (06 Marks)
c. Design a rectangular sedimentation tank for population of 90000 with rate of water supply
140lpcd 80% of which reaches treatment plant. Assume peak factor 1.2 andvelocity of flow
0.3 m/min. (08 Marks)
a. Draw a neat sketch of trickling filter and label the part. Mention the merits of trickling
filters. (06 Marks)
b. Mention modifications of Activated sludge process and explain any two. (06 Marks)
c. Define the following :
i) Hydraulic retention time (HRT)
ii) Volumetric BOD5 loading
iii) F/M Ratio
iv) Sludge age
Write explanatory notes on :
a. Methods of sludge disposal
b. Septic tank
c. Recycling of waste water
d. Oxidation pond.
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3. USN
Seventh Semester B.E. Degree Examination, J";tiftii 2016
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Design of Steel Structures
Max. Marks:100
Note: 7. Answer any FIVE full qwestions, selectimg
stleast TWO questions from esch purt.
2. Use of 15800-2007 and steel tabl,es are allowed"
PART * A
Explain the Design basis of limit state design. (08 Marks)1a.
b.
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c. Explain the factors which govern the.,ultimate strength of steel'sffuctures,
List out the difference between limit state of strength and limit state of serviceability.
(06 Marks)
(06 Marks)
a. Mention the bolt terminoiogy with a neat sketch of group of bolts. (03 Marks)
b. Design a bolted connection between the flange of a column ISHB 45A@907 N/m and a
bracket plate 15 mm thick. The bracket plate is supporting a load of tr50 kN at an
eccentricity of 350 mm. Adopt HSFG bolts of property ciass 8.8. (17 Marks)
A bracket piate is used to transfer the reaction of beam to a colurnn flange of
ISHB 300@618 N/m. A fillet weld of 6 mm is used tc connect the plate and coh.rmn flange as
shown in Fig.Q3. Find whetlier the connection is safe or not" (20 Marks)
Fig.e3
a. Considering the simply supported beam subjected to gradualtry increasing concentrated load
W, at the center, show that
(1) }l4.r:213 : M,
(ir) The hinge length of the plasticity zone is equal to 1/3'd ofthe span. (06 Marks)
b. Explain the methods of plastic analysis. (04 Marks)
c. Determine the plastic and section modulus of a built up section as shown in Fig.Q4(c).
(10 Marks)
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4. fiCY72
PART: E
Design the mernber consists of a single angle to carty a tensile force of 200 kN. The length of
tension member is 3.5 m and subjected to reversal stresses due to wind forces. If the yield
strength and the ultimate strength of the steel used are 25A MPa and 410 MPa and using
18 mm bolts. (20 Marks)
Design a laced and battened column with two channels back to back of length 8 m to caffy an
axiai factored load of 1000 kN. The column is hinged at both ends. (20 Marks)
Explain the types of column bases. (04 Marks)
Design a slab base for an ISHB 350@661.2 N/rn column to carry a factored load of
1000 kN. Mzs concrete and Fe 415 grade steel is used for the foundation. (16 Marks)
8 a. What are the factors, which affects trateral stability? (03 Marks)
b. Design a cantilever beam which is built in to csricrete wall and carrying a load of 25 kN/m
and live load of 10 kltJ/m. The span of beam is 5 m. (17 Marks)
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Estimation and Valuation
Time: 3 hrs. Max- Marks:1QP
Note: Note: l. Answer Q.No. I whictt is connpulsory, Answev &ny FOUR qwestions by
selecting any TWOfrom part B and TWOfrom part C each.
2. Missing daia, if ooy, may be switably assumed.
PART - A
The Fig. Ql(a) shows the detail of a residential building with a ceiling height of 3.5rn.
Workout the quantities for following items.
a. Earthwork in excavation for foundation in ordinary soil @ Rs 21trlcum
b. Plinth concrete of DDC 1:2:4 at the rate of Rs 4200/cum
c. 1't class brick work in CM 1:6 for superstructure at rate of Rs 3500/eum
d. Ceiling plastering at rate of Rs 189/sQm
Dr : 0.9 x 2.1m, Dz : 1.2 x 2.lm
Wi : 1.5 x 1.35m, Wz: 1.2 x 1.35m, W3 : 1.2 x 1.35m
V: 0.9 x 1.2.
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Assume lintel over door and windows ventilators.
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(40 Marks)

6. write detaile,c specification for any ffifollowing:
a. B.B masonry in cm i:5 for superstructure
b. RCC roof slab with CCI:l'/z:3
c. Size stone masonry in CiM 1:6 for basement
d. Ceiling plasfering in CM 1:4
Workout from the first principles the rate analysis f,or any three of the following :
a. Size stone masoffy for foundation in CM i:8
b. BED concrete CC 1:4:8 for foundation
c. Burnt brick masonry for superstructure in CM 1:6
d. 12mm thick plastering for superstructure.
4 a. What is an estimate? Briefly exptrain iifferent types of estimate.
b. Briefly explain (any two)
i) Secu.rity deposit and EIVID
i, Tender and quotation
iii) Wor:k charged establishrnent.
a. Briefly explain contact and differenffinou.,.
b. Briefly explain (any two)
, Administrative approval and technical sanction
i, Measurement book and schedule of rates
iii) Furpose of specification.
lOCV/CT73
(i5 Marks)
(15 Marks)
(07 Marks)
(08 Marks)
(07 Marks)
(08 Marks)
(07 Marks)
(15 Marks)
6a.
b.
I
What is meant by specification? Explain briefly types of the specification.
Exptrain briefly purpose of valuation. What are the methods of valuation? Expiain briefly.
(08 Marks)
Estimate the cost of RCC roof slab in CC l: l1/z : 3 over a room of internal size 3m x 4m.
Also calculate the quantity of materials required, given
Slab thickness : 15cm
Steel reinforcement :
Main steel : 10mrn $ at 150rnm C/C
Distribution steel : 8mm $ at 200rnm C/C
Assume local prevailing rates and 30 crn wall thickness.
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Seventh Semester B"E" Degree Exarnination, .Iune/July 2016
Design of Prestressed Goncrete $tructures
Time: 3 hrs. Max. Marks:i00
Note: l. Answer unj; FIYE fall qwestions, selectimg
wtleast TWA qaestio*cs from each part"
2" Use of IS:1343*198CI is perruaitted.
3..Asswme any wissing data switably.
PART'_ A
a. Define the following :
i) Tendon ii) Pretensioning iii) Post tensioning iv) Load baiancing (EB &{arks)
b. Explain how PSC is more advantageous as colllpared to RCC. (t)6 Marks)
c. Explain with neat sketch, Freyssinet system of post tensioning. (86 Mari<s)
a. A concrete beam with a doubie overhang has the middle equal to 10 rn and the equal
overhang on either side is 2.5 m. Determine the profile of the prestressing cabtre with an
effective force of, 250 kN which can balance a uniformly distributed load of 8 kNim on the
bearn, which included the self weight of the beam. Sketch the cable profile marking the
eccentricity of cable at the suppoft and midspan. (10 Marks)
b. A rectangular concrete beam of cross section 120 mmwide and 300 mm deep is prestressed
by a straight cable carrying an effective force of 180 kN at an eccentricity of "50 mm. The
beam supports an imposed load of 3.14 kN/m over a span of 6 rn. If the modulus of rupture
of concrete is 5 N/mrn2, evaluate the load factor against cracking assurning the selfweight of
concrete as 24 kN/m3 (1CI Marks)
a. A pretensioned bearn of rectangular cross-section 150 mm wide and 300 mm deep is
prestressedby 8, 7mm$ wires located 100 rnm &ornthe sofl-rt of the beam. {f the wires are
initially tensioned to a stress of I 100 N/mm2, calculate ttrre effective stress after all losses,
given the following:
Relaxation of steel: 70 N/rnm2 ; Skinkage of concrete :300 x 10-6
Creep of concrete : 1 .6 i E, : 210 kN/mm2 and E. : 31.5 kN/mm2 (12 Marks)
b. A sirnply supported post tensioced concrete beam of span i5 m has a rectanguXar cross
section 300 x 800 mm. The prestress at ends is 1300 kN lvith zero eccentricity and 250 mm
at the centre the cable profile being parabolic. Assuming k:0.00i5 per ra'r and p:0.35.
Determine the loss of stress dile to &iction at the centre of the beam" (08 Marks)
a. Write short note on prediction of long term deflections. (06 Marks)
b. .A. PSC beam of rectangular section 120 nen'l wide and 300 mm deep;spans over 6 m. The
beam is prestressed by straight cabie carryirrg an effective fbrce of 180 kI.{ at an eccentricity
of 50 mm. If it supportr rn i*por.d load of 4 kN/m and modulus of concrete is 38 khiimm2.
Compute the deflecticn at the follor,ving stages and check whether they cornply with the IS
code speciflrcations. Take density of concrete as 24 kN/rn3.
(r) Upward deilections under (Frestress + Selfrveight)
(i, Final downward deflections irnder ( Prestress + Selfweight + imposed load ) including
the effects of creep and shrinkage assuming the creep coefficient as 1.8 and loss of
prestress :20o/o
I af2
(14 R{arks)

8. PABT _ B
Discuss the different types of failure of PSC beam.
10cv74
{$5 Manks)5a.
b.
6a.
7a.
1^
A pretensioned FSC beam of Double Tee section having a flange 1200 mm wide and
150 mm thick is prestressed by 47AA mm' of high tensile steel located at an effective depth
of tr500 mm. The ribs have a thickness of 150 mm each. If the cube strength of concrete is
40 Nimrn2 and tensiie strength of steel is 1600 N/mrn2, determine the fiexurai strength of the
double T girderusing IS : 1343 provisions. (14 Marks)
A concrete beam of rectangular section, 200 mrn wide and 400 rnm deep, is prestressed by a
a parabolic cable iocated at an eccentricity of 100 mm at midspan andzero at the supports. If
the beam has a span of 10 m and carries a uniformly distributed live troad of 4 kNim, find the
effective force necessary in the cable for zero shear stress at the support section. For this
condition calcuJate the principal siresses. The density of concrete is'24 kN/m3. (10 Marks)
if tire support section of a FSC bearn 100 mm wide and 250 mm deep is required to support
an ultirnate shear force of 80 kN" The compressive prestress at the centroidal axis is
5 N/rnrn2. The characteristic cube streflgth of,concrete is 40 N/mm2. The cover to the tension
reinforcernent is 50 mrn. if the characteristic tensile strength of stirrups is 415 N/mm2,
design suitahle shear reinforcements in the section using iS code recomrnendations.rs
Marks)
Explain the ananysis of anchorage zone stresses in post tensioned members. How is the
burstirag tensile f,orce calculated? (08 Marks)
A high tensile cable cornprising 12 strands of i5 mm dia with an effective force of 2500 kN
is anchoreri concentrically in an end block of a post-tensioned beam. The end biock is
400 mm wide and 800 mm deep and the anchor plate is 200 mm wide by 250 mm deep.
Design suitabtre anchorage zone reinforcements using Fe415 grade HYSD bars using
IS: i343 code provisions. (i2 Marks)
A post tensioned prestressed concrete bearn of rectangular section 300 mm wide is to be
designed to resist a live load rnoment of 360 kNm on a span of 12 m. Assuming 10% loss
and limiting tensile and compressive stress to tr.5 MPa and iB MFa respectively. Calculate
the rninimum" possible depth and the prestressing force and corresponding eccentricity.
Take D":24'kN/rn3" (20 Marks)
*****
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9. USN
5a.
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10cv755
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(06 Marks)
Seventh Semester B.E. Degree Examination, June/July 2016
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2 a. List the payment surface characteristics and expiain briefl3z.
b. Write a note and mention IRC standards:
The speed of overtaking and overtaken vehicles are at 70 kmph and 40 kmph respectively.
Determine overtaking sight distance. Take a: A.99 m/sec2. (06 Marks)
i) Width of,formation ii) Right of way-lRC only flor open areas.
Derive an expression for overtaking sight distance.
PART - ts
Define Gradient and its tlpes.
A vertical summit curve is forrned at the intersection of two gradients, +3.0 and -5.0
percent. Design the length of summit curve to provide a stopping sight distance for a design
speed of 80 krnph. ,{ssume data as per IRC. (06 Marks)
A valley curve is formed by a descending grade of I in 25 raeeting an ascending grade of
i in 30. Design the length of valle.y curve to fulfil both confort and head light sight distance
requirements for a design speecl of 80 kmph. Assume allowable rate of change of centrifugal
acceleration C : 0.6 m/secr. (08 Marks)
Highway Geometric Design
Tir:ne: 3 hrs. Max. Ivlarks:100
Note: Answer FIVEfwll questionsu setecting
at least TWO questions.f,rom ewck purt"
PAR]T _ A
a. What is PCU? What are factors affecting FCU values? (08 Marks)
b. The following data were obtained &om the spot speed studies carried o,ut at stretch of
highway during a certain period of tin,e. Suggest
i) Speed limit for regulation of traffic.
ii) Lower speed group causing congestion.
ii) Speed for desisn of seornetric elements.
Speed range
Kmph
No. of "vehicles
observed
Speed Range kmph i.{o. of vehicies
observed
0to i0 12 50 to 60 225
10 to 20 l8 60 to 70 1i9
20 to 30 68 70 to 80 43
30 to 40 29 80 to 90 33
40 to 50 2A4 90 to 100 09
(12 Marks)
(nS Marks)
(10 NIarks)
(88 Marks)
Find the rninimum sight distance to avoid head-on cotrlision of 2-cars approaching at
90 kmph and 60 kmph. Given : t: 2.5 secs, f : A.7 and Brake efficiency of 50ok in either
case. {05 Marks}
,.
4a.
b.
Write a design procedure of evaluating super etrevation as per IRC.
A state highway passing through a rolling terrain has a horizontal curve of radius equal to
ruling minimum radius. Design all the geometric features of the curves.
Assume : V : 80 kmph, No. of lane :2 and I = 6 m
I of2

10. 10cv755
6 a. Define uncha.nnelised and channelized intersections. Write a neat sketch, of typical
unchannelised and channelized intersections. (i0 Marks)
b. What is intersection at grade? Explain the basic requirements of intersection at grade.
(10 Marks)
7 a. What are grade separated intersection? Explain their advantages.
b. V/hat is rotary intersection? Explain the design factors of rotary.
(08 Marks)
(12 Marks)
(08 Marks)8a.
b.
What is higtrway drainage? Expiain its requirements.
The maximum quantity of water eNpected in one of the open lcngitudinal drains on clayey
soil is 0.9 m'lsec. Design the cross section and trongitudinal slope of trapezoidal drain
assunring the bottomwidth of the trapezaidal sectionto be 1.0 m and cross slope to be 1.0
vertical to 1.5 horizontal. The aliowable velocity of flow in the drain is 1.2 m/sec and
Manning's roughness co-efficient is 0.02. (12 Marks)
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11. l0cv765
USN
Time: 3
Note:
Seventh Serneste r B.E " Degree Exa min atio n,-SHbTltuly 2 0 1 6
Air Pollution and Control
hrs. Max' Marks:i00
Answey axty FIVE fwtl qwestions, selecting atleast TWO qwestiorus frow each parL
"ganf;A
Define Air Pollution. Explain primary and secondary air pollutants with examples.
(10 Marks)
How London smog is different f,rom Los Angeles smog? Explain. i10 Marks)
Explain briefiy the hannful effects df sutrfur dioxictre on human being and plants. (1$ Marks)
nxptain the effects of Air pollutants on materiais. (trO Marks)
Explain with a neat sketehes, how ptrume behave in different atmospheric stability condition.
(tr0 S{arks}
Define Windrose. Explain the importance ofwindrose in a.ir pollution studies' (10lt{arks}
Discuss the tactors to be considered for locating an industdal plant with reference to the air
pollution. (xCI Marlisi
^Expiain
the irrrportance cf proper planning anel zoning oi industrial and residential areas
from the point of air pollution controi. (ls Marks)
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PART,- B
a. What are the basic considemtions of air sampling? Discuss'
b. Expiain the procedure for the coliection of suspendeel particulates by
6 a. List the advantages and disadvantages of cyclones separator and
industrial apPlication s.
b. Explain with a neat sketch spray tower wet scrubber'
7 a. Explain air poliution due to gasoline and diesel engines'
b. What are the causes of acid rain and discuss their remed.ial measures?
I Write shofi notes on the foliowing :
a. Global wanting.
b. Ozone layer dePletion.
c. Bhopal gas tragedy.
d. Meteoroiogicalmodels
{08 &larks}
high volume samPler.
(12 Manks)
also rnention their
(10 iltarks)
(1ti Marks)
(10 Marks)
(18 Marks)
(20 &Xarks)