7th Semester (June; July-2015) Civil Engineering Question Paper

1. USN 10cv71
Seventh June/July
- ll
2015
(09 Marks)
(03 Marks)
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(05 Marks)
(04 Marks)
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-fime: 3 hrs. Max. Marks:100
Note: l. Answer any FIVE full questions.
2. Relevant charts are permitted.
Explain the need for good sanitation. Hence, describe types of sewerage'system and their
suitabiliry. (06 Marks)
Explain factors affecting DWF and the effects of flow variations on the design of sewerage
systems. (07 Marks)
A certain district of a city has a projected population of 50000 residing over an area of
40Ha. Find the design of discharge for the sewer line, for the following data :
i) Rate of water supply - 200 0pcd ii) Average impermeability factor for the
area = 0.3 iii) Time of concentration = 50 minutes. The sewer line is to be designed for
a flow equivalent to the WWF plus twice the DWF. Take sewage generated as equal to 7 5%o
of water supplied. Use the formula :
25.4a
R, = Comment on the result. (07 Marks)
r+b
a. Explain the effect of tlow variations on velocity of flow in sewers. (06 Marks)
b. Explain i) self cleansing velocity ii) Non - scouring velocity. (05 Marks)
c. A 600mm diameter sewer is required to flow at 0.4 depth on a grade ensuring a degree of
self cleansing equivalent to that obtained at full depth at a velocity of 850mm/s. Find the
required grade, associated velocities and rates of disch arge at full depth and 0.4 depth.
a.
b.
c.
a. Explain the need for providing sewer appurtenances in sewerage system. Hence name
common sewer appurtenances. (04 Marks)
b. What are inlets? Draw the locations and section of inlet and explain. (06 Marks)
c. What is Manholes? Explain the need of manhole. Draw neat sketches of deep manhole.
(10 Marks)
Take n = 0.015 for ail depth of flow. [Given
i = 0.374'
+ - 0.857 ].
a. Differentiate between fresh sewage , stale sewage and septic sewage.
b. What is first stage BOD? Derive the equation for 1't stage BOD, with a
c. Explain COD and its relation with BOD.
d. What is Treatability Index? What is the use of treatability index?
a. Explain various factors that affect self purifications process of stream. (07 Marks)
b. Explain waste water disposal into sea. (05 Marks)
c. 100m3/s of a city te*ag. is discharged in a river which is fully saturated with oxygen and
flows at a minimum rate of 1250 m'/s, with a minimum velocity of 0.15m/s. If the 5 - day
BOD of the sewage is 260 mglLt, find where the critical DO will occur in the river. Take
Ko = 0.11d-' , f = 4.0. Also ultimate BOD is l25To of 5-d BOD of the mixture of sewage
and river water. DO saturated for river water = 9.l7mglLt. (08 Marks)

2. b. Write a note on grit - chambers.
c. What are skimming tanks? Explain with a neat sketch.
a. Explain the bi<llogical treatment techniques for treating waste - water.
b" What are HRTF's? Explain importance of recirculations and its effect
HRTF's.
c. The MLSS concentration in an aeration tank is 2000mg/[t and the
minutes of settling in a 1000mt cylinder is 176mt,. Calculate :
i) SVI ii) SDI iii) Required return sludge ratio and iv)
recirculated sludge.
a. What are stabilization ponds? Explain the algae - bacteria symbiosis in
with a neat sketch.
b. Explain the stages in anaerobic sludge digestion.
c. Draw a neat sketch of septic tank with soak pit. Write the design criteria
tank.
10cv71
a. Explain the importance of providing rocks and screens in a waste - water treatrnent planl.
Draw a neat sketch of a bar - screen and explain the loss of head through the screen.
(10 Nlarks)
(05 l'Iarlis)
(05 N{arks)
(06 Nlanksr
on the efficiency of
(06 Nlarks)
sludge volume after 30
SS concentra-tion in the
(08 Marks)
au o:li,Calion punrl
(06 lIarks)
(06 N'Iarks.l
required for septic
(08 lVlarks)
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1 ,-'F 1

3. USN
Time: 3 hrs.
c. Explain briefly:
i) Partial safety factors for loads
il) Characteristic strength of steel
ii, Plastic, compact and semicompact members.
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t0cY72
(05 Marks)
(05 Marks)
(10 Marks)
(04 Marks)
(10 Marks)
Seventh Semester B.E. Degree Examination, June/Juty 2015
Design of Steel Structures
Max. Marks:100
Note: 7. Answer ony FIW full questions, selecting
atleast TWO questions from each part.
2. 15800-2007 and steel tables permitted. ,l
PART_A ::....
i
Briefly explain the failure criteria for steel.
Mention the advantages (any five) and disadvantages (any three) of steel members.
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b.
Mention any four advantages and disadvantages of Bolted connections.
,.,...,, Fig.e.3(a).,::.
b. , Determine the suitable weld size for the connection shown in Fig.Q.3(b).
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Two plates of l6mm thickness have been conneited in a lap joint using HSFG bolts. Design
the joint so as to transmit a pull equal to the full strength of plate. Adopt 16mm diameter
bolts. Assume edge distance of 30mm,pitch: 60mm. (08 Marks)
c. Determine nominal shear capacity, *{gqfgn shear strength nominal bearing strength and
design strength in bearing for M) ($roperry class 8.8 bolts assuming bolt threads outside
the shear plane. Bolts are c-offieted to 12mm thick plates. Assume end distance of
bolt = 30mrq pitch : Somraf" 410 MPa, &u : 201mm2. (08 Marks)
3 a. Determine size of weldr$Ilransmitted, length of weld and tensile strength of plate (smaller
width) for the platep qlxiwn in Fig.Q.3(a) if the plates are of 10mm thick each. Assume
suitable partial safeti factor and yield stress for weld and steel plates. (10 Marks)
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4. 4 a. Define plastic hinge, collapse load, shape factor, a mechanism and plastic moment.
State lower and upper bound theorem.
Determine :
i) Number of possible plastic hinges
ii) Number of independent mechanisms and
ii, Collapse load for the beam.
Shown in Fig.Q.4(c)
b.
c.
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(05 Marks)
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PART _ B J,
Mention the steps followed for designing a Tie membei.
M20. Adopt &
: 25OlutPa for steel.
What is web bukling and web crippling? Explain briefly with sketches.
Design a single angle to carry a tension of 100kN. Adopt }d20, Grade 'C', property class 4.6
bolts. Assume yield and ultimate strengths of the steel as 250MPa and 410MPa respectively.
Also, check for rupture and block shear. Assume Ar5 for Mzo holt : 3l 4 mtrf, pitch - 60mm,
edge distance : 40mm. (15 Marks)
Determine the design load carryrng capacity of a single angle (discontinuous)
ISA 50 x 50 x 5 used as a colnprds'Sion member in a roof truss connected to a 10mm gusset
by two bolts. The center to- 'center distance between and connections is 1.50mt. Assume
! - 250MPa. -' (10 Marks)
Determine the load carryihg capacity of two angles ISA 70 x 70 x 6mm connected to both
sides of gusset using two bolts. Sketch the details. Adopt Smm gusset plate. Length of the
angle be 2.50mt.' (10 Marks)
Explain brieff steps involved while designing a slab base and a Gusseted base. Also, sketch
the details@ithout scale). (10 Marks)
Dete e area of slab base, dimensions of the slab base and thickness of the base plate for a
stwi'e61unm caffying factored axial load (compression) of 1000kN. Pedestal is of concrete
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c.
Briefly explain the steps involved in designing a steel beam as per IS800 - 2007 . (05 Marks)
Determine the design bending strength of ISMB 400 @ 61.6 kg/m having effective span
l0m. Is the section is plastic or compact? (10 Marks)
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5. CT
USN t0cY74
CEfiiTRA L
LIBRARY
Seventh Semester B.E. Degree Exami !on, Ju lrly 20ts
Design of Pre-Stressed Gonci€ Gtures
Time: 3 hrs. Max. Marks: !00 -
Note: 7. Answer anJ, FIWfutl questions, selecting - flr"
atleast TWO qaestions trom each parl ,*J "
g 2. (Ise olls : 1343 - 1980 is permifred , ff;Y
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3. Missingdata,if any,maybesaitabllassumcd.4-)
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"(fi 1 a. Distinguish between the following terms
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E il Uniaxial and biaxial pre-stressing ,,-.ei'
ri E ii) Concentric and eccentric pre-stressing. F" (06 Marks)
gf - i' P:.r:.'EtrFs-:tojd:Tgll"*:"0:1,:4*"e-',Kvi:':', 91y*I'lE E D. vvral arc rne raGrors mrruencug me creep ano snnrxage qloqpcrele. (uo Mrrk)
t 5 c. Brief the Magnel Blaton system of post - tensioning witil$"eat sketch. (08 Mrrks)
$[ 2 a. Asimply zupported pre-stressed concrete *"-rrft *ide by 500 mm deep of effective
E i^ span 9 m carries a distributed load ofintensitfftl$/m (including selfweight). The beam is
H g pre-stressed by a straight tendon carrying6nfdlce of 200 kN located 100 nun below the
: .€ centroidal axis of the bearn Determine therlotttion of the thrust line in the beam and plot its
; I position at quarter, central and suppor(Septions. (08 Marks)
E E b. A concrete beam, 120 mm widg@{0O mm deep is pre-stressed by a straight cable
Z"Z carrying an elfective force of l8($y'at an eccentriciry of 30 mrn The biam .punring ouo
i I 6 m supports a total udl of 4IN X-which includes the self weight of the beam. The initial
A; stress in the tendons is l0$,ltrhnm'. Determine the percentage of stress in the tendons due
S ! to the loading on the beqr$Y.:210 lt,l/mm2 ;
p" = iS kN/mm2. (12 Mrrks)
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3 a. List the vartolsKdCof pre-stress in PSC beams and write the equations us"O.lr?ffi;
f.a b. A pretensiory)y#"., 200 mm wide and 300 mm deep is pre-stressed by 10 wires of 7 mm
E $ diameter_i[$ttlly stressed to 1200 N/mm'with their centriods located 100 mm from the
;.d soffit. jfit-the shess in concrete immediately after transfer, allowing only for
-*.B * "- ' ' elgs^tS$irtening'of concrete. If the concrete undergoeja firther shortening dui to creep
E E a{g*Xiotag. w1ile there is relaxation of five percent of steel stress, estimate the final
a f ;{ricentage loss of shess in the wires using the Indian standard code of IS : 1343 - 1980
$E .0"re8ulations. Take E, = 210 kN/mm2 O = 1.6 residual shrinkage strain = 3 x l0{
E€ v tu=42N/mm'. (r4Marks)
lkS a. Using Mohr's theorem, obtain an expression for central deflation in a PSC beam due to pre-
9' stress produced by a parabolic cable with eccentricities e2 above the centroidal axis at
ral
I " supports and eccentricity et below the centroidal axis at midspan. (06 Marks)
g b. A post tensioned pre-stressed concrete beam of span 8 m with a rectangular section 300 mm
i wide by 400 mm deep is pre-stressed by a calbe containing initial force of 1500 kN. If the
E beam supports a live load of 20 lN/m excluding its selfiveight, compute the initial deflection
E due to pre-stress, selfineight and live loads for the following cases :
- r) The cable profile is straight with a constant eccentricity of 100 mm
ii) The cable profile is parabolic with a dip of 100 mm at midspan and concentric at
supports. Assume the modulus of elasticity of concrete as 36 k}.{/mm2. (14 Markr)

6. t0cv74
PART-B
5 a. Explain with sketches, the method of estimating the ultimate flexural strength of flanged
pre-stressed concrete sections according to IS : 1343 code specifications. (06 MrItO
b. A post tensioned bridge girder with unbounded tendons is of box section of qflr[tl
dimensions 1200 mm wide by 1800 mm deep, with wall thickness of 150 mm- IhbJfrgh
tensile steel has an area of 4000 mm2 and located at an effective deoth of 1600 ffiralA ore-
stress in steel after all losses is 1000 N/mm2 and the cffective span of the gif{,M+ * lf
tr= 40 N/mm2 and $ = 1600 N/mm2, estimate the ultimate flexural streggtiVthe section.
l!, (r4Mork)
6 a. A concrete beam having rectangular section 200 mm wide, 400 *il&; pre-stressed by a
parabolic cable having an eccentricity 120 mm at the centre of$fnvreducing to zero at the
supports. The span of the beam is 10 m. The beam suppdg)-a live load of 2.5 kt[/m.
Determine the effective force in the cable to balance the-d1,6-and live loads on the beam.
Estirnate the principal stresses at the support seaion-aa+S!6c.*:+{${lnf;-- -ttoMarts}--
b. A rectangular section having a width of 500 mm an{ffi mm deep. The beam spanning over
16 m is pre-stressed using a cable carrying aqeffifive force of 2000 lclt{/ The cable is
parabolic with an eccentricity of 300 mm at cepfiftTspan andzero at supports. Estimate the
ultimate shear resistance at the support sSpft. Also evaluate the maximum permissible
distributed working load on the beam gs3Wming a load factor of 2 and characteristic
compressive strength of concrete as 4trTtdri*z and loss factor as 0.8. (10 Marks)
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7a.
b.
Explain the process of transfer o
Briefly discuss the stress di n in the
c. Explain end zone rein ts.
in pretensioned members.
end block of post tensioned members.
(08 Marks)
(07 Marks)
(05 Marks)
"-+''l "io
Determine the miniffiuilffir
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ffir depth of 300 mm wide rectangular beam and the corresponding
pre-stressing fo
Dc : 24 kN/#. The span being 12 m. (20 Marks)respectivq(l
Determine the
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depth of 300 mm wide rectangular beam and the corresponding
pre-stressing forffid corresponding eccentricity to resist a moment of 360 kltm assuming
l0% losses ffqd'Smiting the tensile and compressive stresses to 1.5 MPa and 18 MPa
respectiv*dffi,te Dc - 24 kN/#. The span beine 12 m. (20 Marks)
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Highway Geometric Design
Time: 3 hrs. Max. Marks:100
Note: Answer any FIW full questions, selecting ,i,i,,,,ij.
stleust TWO questions from each part. :
'1.,
PART-A , '-, '
.:.:
a. Mention certain basic design controls and criteria which govern the geometrio &itures of a
highway and explain any two of them. : ": (10 Marks)
b. Enumerate the concept of PCU in mixed traffic flow on highways. Gi ;PCU values for
different classes of vehicles for urban roads. .,,-,,,,.'",,,r"', (06 Marks)
c. Define capacity and write the theoretical formula to calculate capaciql.
.- (04 Marks)
a. Write short notes on : i) service roads ii) drive ways iiil-iffi of way. (06 Marks)
b. What is camber? State the objects of providing camber. Girre, IRC values for different types
of roads in heavy and light rainfall areas.
Mention the factors affecting sleid resistance.
In a district where the rainfall is heavy major distriit ioad of WBM pavement 3.8 m wide
and a state highway of bituminous concrete ,p.gvement 7.0 m wide are to be constructed,
what should be the height of the crown with+iespect to the edges in these two cases?
,,.ir (04 Marks)
3 a. WhatisPlEvtheory?Explain.
^nL (06Marks)
b. Mention the factors on which tt€4ffiimum over taking sight distance required for the safe
overtaking. _1"
' ' (04 Marks)
c. The speed of overtaking aq$iertaken vehicles are 70 and 40 kmph
-respectively on a two
way traffrc road. If the acqoYeiation ofovertaking vehicle is 0.99 m/sec2 :
i) Calculate safe overtcking sight distance
ii) Mention the pili.tnum length of overtaking zone and show the positions of the sign
posts. &*r (10 Marks)
, -1i,
Write note;o$ftechanical widening and psychological widening.
What is--tibrisition curve? Mention the different types?
Calc rffi super elevation to be provided for a horizontal curve with radius of 400 m for
desj$speed of 100 kmph in plain terrain. Comment in the results. What is the co-efficient
b{lateral direction mobilized if super elevation is restricted to 0.07 . (06 Marks)
d:',-Calculate the values of ruling minimum and absolute minimum radius of horizontal curve of
a nation highway in plan terrain. Assume ruling design speed and minimum design speed
values as 100 and 80 kmph respectively. Take e - 0.07 and f - 0.15. (04 Marks)
.ir,rr"*,,li]ir
. PART-B
5 a. Explain the following with IRC specification : i) Ruling gradient ii) Minimum gradient
iii) Exceptional gradient iv) Limiting gradient. (10 Marks)
b. While aligning a hill road with a ruling gradient of 6 percent horizontal curve of 60 m is
encountered. Find the compensating gradient of the curye. (04 Marks)
c. A valley curve is formed by descending gradient of I lrr.25 meeting an ascending gradient of
1 in 30. Design the length of valley curve to full fill both comfort condition and head light
distance requirement for a design speed of 80 kmph. Assume allowable rate of change of
centrifugal acceleration c 0.6 m/sec2. Assume t:2.5 sec f 0.35. (06 Marks)

8. a. Mention the principles to be considered in the good design of intersection.
b. Differentiate between at-grade and grade separated junction.
c. What is median? What are the functions of medians?
d. Define channelization. Mention the purposes of channelization.
leaf,
c. Explain the advantages and disadvantages of an over pass.
a. Draw a neat diagram of rotary intersection (round about) and show the differen(,qffi,.'rcnts?
.,.**'Sb Marks)
b. What is clover leaf interchange and what are its advantages? Draw a neat diagffim of clover
10cv75s
(05 Marks)
(04 Marks)
(06 Marks)
(0s N{,a$illts)
(06 Marks)
(04 Marks)
a. Mention the importance of highway drainage. , " (05 Marks)
b. Draw the section of surface drainage system in urban roads and,,,,bgJilain briefly. (05 Marks)
c. The maximuq quantity of water expected in one of the open;''ffirgitudinal drains on clayey
soil is 0.9 m'/sec. design the cross section and longituffial slope of trape zordal drain
assuming the bottom width of trapezoidal sectionJq td 1.0 m and cross slope to be
1.0 vertical and 1.5 horizontal. The allowable velocby'bf flow in the drain is 1.2 m/sec and
mannings roughness co-efficient is 0.02. (10 Marks)
*iX.***
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