UPSC IAS 2015 Question Paper for Civil Engineering Paper-I

CS (Main) Exam:2015 C-AVZr-O-DFOA

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W - 'R - 1
CIVIL ENGINEERING
Paper—I

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Time Allowed : Three Hours Maximum Marks : 250

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OUESTION PAPER SPECIFIC INSTRUCTIONS

Please read each of the following instructions carefully before attempting questions :
There are EIGHT questions divided in Two Sections and printed both in HINDI and in ENGLISH.
Candidate has to attempt FIVE questions in all
Question Nos. 1 and 5 are compulsory and out o f the remaining, THREE questions are to be attempted
choosing at least ONE question from each Section.
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itself
Unless otherwise mentioned, symbols and notations carry their usual standard meanings.
Attempts o f questions shall be counted in sequential order. Unless struck o ff attempt o f a question shall
be counted even if attempted partly. Any page or portion o f the page left blank in the Question-cum-Answer
Booklet must be clearly struck o ff

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I

VI " V-
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SECTION—A
Q. 1(a) 6m AB f^*T AD SRI % ft^T WT I, %T ^ w
11 m 10 kN11 W f% *pft f ^ f t #, WcPT AD 3 ^T
f^rsrf^T

A rod AB 6 m long is held against sliding by a string AD. The rod weighs 10 kN.
Determine the tension in the string AD assuming that all surfaces are smooth. 10

4m

k 1

Q. 1(b)? M t ^ ftf^ f ¥ ^ r f Tctt 11 to r
WIT f^TT tfWT t f% ^ «RTTCT
^ i <fr gsrnj i /;

The global stiffness matrix of a structure contains rigid body displacements. Describe how
to modify it to account for nodes having zero displacements. Give two approaches. 10

Q. 1(c)
A B c D
A* TT ~UT IX El = Constant
I = 200 x 10"6 m4
5m , 4m 6m E = 200 GPa
*■--------------*------------- ¥----------------k

f^T if f^r TT^r ^ M, STT^f ( ^ T ) 3 n ^ *FTJ%, ^ ^nrtf ‘B’ 10 mm %fccT
FfaT 11 smjijf f^cR^T ^ I
Draw the B.M. diagram for the beam shown in figure when support B settles by 10 mm,
using moment distribution method. 10
Q. 1(d) ^Tcfr tpr W W T ^
^ TftUm ft -Ft T5T 11 3m
t (?Nf fom t ) 0.01 cm/s t afk
1m^ ttcT t 3TTO 0.1 cm/s (fNT ftw $) 11
W ^ ^TcT ^ ^frTW 3fk ^srfsfT ^ e H t % 3TFS MWoptfcTcfl

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i I A i
XTXX

The ground water movement at a site takes place through a soil zone comprised of 3 m
thick sand with coefficient of permeability 0.01 cm/s (in both directions) overlain by
1 m thick fine gravel with coefficient of permeability 0.1 cm/s (in both directions).
Determine the coefficient of permeabilities applicable for horizontal and vertical ground
water movements through the layer. 10

Q. 1(e) ^PT v, WT ^ r^ ^f ^
#cfT t I 1.5 m %ry 0.8 m s'1 W WT t i f M k *TFT
% 0 .5 m 3 k 1.25 m MT? % f ^ T I

At the entry of the pump intake the velocity v varies inversely as the square of the radial
distance r from inlet to suction pipe. The velocity is found to be 0.8 ms-1 at a radial
distance of 1.5 m. Compute the acceleration of flow at radial distances of 0.5 m and at
1.25 m, from the inlet assuming the stream-lines to be radial. 10

Q. 2(a) f ^ T ^Kt (Borrow pits/sites) % ^ ft£\ ^4d®£T I
3 s r f t e 1.0 x 105
J**v. m3 *TT sfk » 0.75 W I (In-situ)
(^nrnfr enw) # f¥ $ f^ r fan w 11

Borrow site Void ratio Total cost per cubic meter

1 ,0.8 Rs. 200

2 1.15 Rs. 180

3 1.25 Rs. 175

wf % w r to ra fr ^ i

Material for an earthfill was available from three different borrow pits/sites. In the compacted
state the fill measured 1.0 x 105 m3 at a void ratio of 0.75. The corresponding in-situ void
ratio and cost (cost of material and transportation) of the material for three sites are as
follows :

Borrow site Void ratio Total cost per cubic meter

1 0.8 Rs. 200

2 1.15 Rs. 180

3 1.25 Rs. 175

Determine the most economical site for the above earthfill work. 15

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Q. 2(b) ^ ftTRcft (I-section) 6.0 m l , % OTT i \ 200 k N ^
^cT, 2.5 m ^ 11 I-%^FT % ^JWt 3^t f ¥ ^ q#%T 200 x 200 mm
^ ^ 800 mm x 6 mm 11

^cTRJcf tf^rrr ^4-5R)cj( tf^TT ^ Rw 110 MPa, 165 MPa

3?tT 100 MPa sFTCT: ?t <ft, tf^T ^ t o r ^ MR^k ^ I

J!^< ^T W*TTC *1vj|<3i^N fa>i|| yff ^i'+>dl 1? 1

Two wheels, placed at a distance of 2.5 m apart, with a load of 200 kN on each of them,
are moving on a simply supported girder (I-section) of span 6.0 m. The top and bottom
flanges of the I-section are of 200 x 200 mm and the size of web plate is 800 x 6 mm.

If the allowable bending compressive, bending tensile and average shear stresses are
110 MPa, 165 MPa and 100 MPa respectively, check the adequacy of the section against
bending and shear stresses, self weight of the girder may be neglected. 20

Q. 2(c) 4i^ tr ^ w 3pjr n ^rfcP^T (# cr tttsct) (fcR^) afhr f ^ F (f»r)
ePTT^ 3fRkul % % ^TFT 100 ms-1 91ipHd
M It

TOW t 5 ~m # r -90°C dIHHM 'CK ^ W*T 1% Z-TcT
^TR (T T frm % fcR p = 7.7 kg m“3, M T 1.2 x 10~5 Ns) cFTWT
V fm 295 ms"1 11
TjTif Tjcin?^ aflr Tn^er # r snf^wr ^ sp|w ^rf^RT
# ferq 1% #r sryrN -# ^ ; i

^*T MHPT W 1.2 kg m”3 3^T WPRTT 1.8 x 10-5 Ns t I

In order to predict lift and drag forces on a scale model of an aircraft during a section
of operational envelope, involves sea level flight at 100 ms”1, where the speed of sound
may be taken as 340 ms-1.
It is proposed to utilise cryogenic wind tunnel with Nitrogen at 5 atmosphere of pressure
and a temperature of-90°C (p = 7.7 kg n r 3, viscosity 1.2 x 10~5 Ns for nitrogen). The
speed of sound in nitrogen at this temperature is 295 ms-1. Determine the wind tunnel
flow velocity, the scale of model to ensure full dynamic similarity and, the ratio of forces
acting on the model and prototype.
Mass density of air 1.2 kg m“3 and viscosity 1.8 x 10-5 Ns. 15

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Et

Q’ 20 kN 20 kN
c D
-------3v

2m 1m 1m 2m
¥-------- — ¥■-------------------------- ¥-¥------- ---------r
far g*T $ feft ‘A’ *R ^cTFT 3^T ‘B’ ^ ? VW TOFT. TT 3;srf£R f a M
irf^TT sgftTf sHTT ^ I El = WF$t?Z 3 I

Determine the slope at A, vertical deflections at B and mid span using the moment-area
theorem. Take El - Const. 15

q . 3(b) ^ ir f t ^ ,^ t t e r , apr^FS' tftrcr ^r 60 kN ^ tf%rr
7.5 kNm/m ^rpfr % ^ *R T 3R TST t , % ^ T T 11
M 30 ite ^ sfft Fe 415 frs W \
= 30 mm

^ FT = 1.5 MPa
^T = 2 MPa
^ o cr ^f^nfr - 9
Design a section of wall of a water tank on uncracked basis to resist a pull of 60 kN and
a bending moment of 7.5 kNm/m width producing tension on the water face. Use M 30
concrete and Fe 415 grade steel.
Effective cover = 30 mm
Permissible stress in direct tension in concrete = 1.5 MPa
Permissible stress in bending tension in concrete = 2 MPa
Modular ratio = 9 15

Q. 3(c) cffa WT f e r ^ fapfNR W f I W % Tftfr t :
Pipe D (mm) L (m) f
A 150 600 0.020
B 100 480 0.032
C 200 1200 0.024
MI^H wr ^ i ^

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Three pipes are connected as shoW in figure. The characteristics of pipe are as follows :
Pipe D (mm) L (m) f
A 150 600 0.020
B 100 480 0.032
C 200 1200 0.024
Determine the flow rate in each pipe. Minor losses may be neglected. 20

q . 4(a) to t o wt ^
i

What is the preconsolidation pressure ? Describe a method to determine the preconsolidation
pressure. 15
Q. 4(b) ^ ^T' $ ?RT ^ W I ^ T ^ 3TWFT
155 N-m (Torque) s rr^ rw r 11 ^F*T 100 mm 3^r ci^i{
150 mm 11 ftnrr (Cu) w ^ % ot Rrt, ftwn; # c
3 p f |^ *^=*T 3TTO ^TPJcT ^ M ^ I

An in-situ vane shear test was conducted at the bottom of a borehole in a soft clayey soil.
A torque of 155 N-m was required to shear the soil. The vane was 100 mm diameter and
150 mm long. What was the undrained shear strength, Cu of the soil ? Derive the relevant
expression relating to torque vane dimension, and undrained shear strength of the soil.
15
Q. 4(c) ftdPOf W ^ WT ^ tWTcf sHTT ^[faf W t l ^
ftft f^T^T ^Ffc^ 19 kN/m3 ^ xrfjteT 3TTO ftqfa 30° t , ^STR?T TBT f I <4^
' f^W T ^ cT ^ f^TT^T git i M 30
<r Fe 500 ^ w 11

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A counterfort retaining wall is shown in figure in plan and sectional elevation. It retains
dry earth having a density of 19 kN/m3 and angle of repose of 30°. Design a counterfort
in flexure only using the limit state design. Take M 30 grade of concrete and Fe 500 grade
steel. 20

3m

0.5 m

6m

0.5 m

3m

■+— J[ p l a n
5m 0.5 m
(a)

(b) SEC A-A

SECTION—B
Q. 5(a) (i) w r, ^ ^ m fowifacft
1.95 x 10-3 m V 1 ? 1500 ft, ¥T ^TRT ^ I WT ef^T4 if
wdr& i w m WT W 11
Determine the diameter of the vertical pipe needed for a flow of a liquid of kinematic
viscosity 1.95 x 10"3 m2s“1 at a Reynolds number of 1500. The constant pressure is
maintained throughout its length. 5

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Q. 5(a) (ii) ^ M tST Jff M I I : . ; . ..
#TeT # cTwf = 1 8 km, Pl*-*Kui = 250 m3s-1
W U i = 2.5 m, ^Tef i t = 50 m
^Tcf W WcT ^erfsR #cT 1 : 50 «T #eT 1 : 500 *TC ^TRT W t I
;■ m fa 12 ^ 11

KTteT ^ 3?tw (m/sec) 3ffc 3T^r WT ^ I
Prototype data of Tidal Channel are as follows :
Length of channel = 18 km, Discharge = 250 m3s_1
Depth = 2.5 m, Width of the channel = 50 m
Model is built with a vertical scale of 1 : 50 and a horizontal scale of 1 : 500
Tidal period is 12 hours
Compute the average velocity in ms-1 and tidal period in the model. 5
Q. 5(b) ^ sjs*T cTT^T 3 '("ftlcfttH a = 3Vv W TFT 11 t - 2 sec Tt,
8m c[i] 6 m/sec 1 1 WT t = 4 sec TTC W^T f ^ W , c37?T f*PFT$f I
a = x^T W v = %^r |
A particle moves on a vertical line with an acceleration a = 3-s/v . At t — 2 sec, its
displacement is 8 m and velocity is 6 m/s. Determine its displacement, velocity and
acceleration at time t = 4 sec. a = acceleration and v = velocity. 10
Q. 5(c) TTcff tw z ^Tt 12 m en^T t , 11 ^ t WT
t , <rt 3T$fcr y rr (couples) 50 kNm ? 75 kNm 5 m W9 m
f tr t % '% r ^TT TFT | |
w rc M w ^ # w t cmM ^tft iH
3TT% I

A horizontal shaft 12 m in length is fixed at its ends. When viewed from its left end, axial
couples of 50 kNm clockwise and 75 kNm counterclockwise act at 5 m and 9 m from the
left end respectively.
Determine the end fixing couples and the position where the shaft suffers no angular
twist. 10
Q. 5(d) ^ ^T frfc' WTcTT ^t°T 15° t (*#T % "TNT W t )
3 'HK 18 kN/m3 ^ sr*T74t #teT 3TR5 <() = 35° 11 'm
M f ftefcTT it ffc tf To ^ : (i) WRTT ^ ¥<T % #TW Tfef
- *fT f^TR^RT Ft, (ii) uR $ W *fT # T ^FTRR Ft TFT Ft I

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An infinite natural slope with angle of slope 15° (inclination measured from horizontal)

has a saturated unit weight of 18 kN/m3 and an effective angle of internal friction, § ~ 35°,

Determine the factor of safety against failure of the slope (i) when the slope is completely

dry or submerged but without seepage, (ii) when seepage occurs at and parallel to the

surface of the slope. 10

5(e) Fe 410 ^ it 300 x 10 mm sfk 280 x 10 mm t tts

vrirrv ? $ w I % ^ t a i w ti

ite z veiled ^ ^ t in i e r

^ i

^ 3TTO = 250 MPa

ym„
1mo = 1.1
'S«rc, < 3rnr? S'+cf) = 1.5

Design a welded lap joint to join two plates of size 300 x 10 mm and 280 x 10 mm in

Fe 410 grade steel to mobilise the tensile strength of the plates using field weld.

Yield strength of material = 250 MPa

v/'m
ti--o = 1.1

Partial safety factor for field weld - 1.5 10

p *~i _ I W

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Q. 6(a)

TOT ^ ^rfaT w l l 3^rf£R 3(WFT ®RT 10 kN ^ f^TSjfftc
W ^TT cPTM W t l ^ ^ 3R W I ¥f<facT (f%*TC ^ f ) f^T^T TO ^ i

A beam has a cross-section shown in figure. It is subjected to a vertical shear force of
10 kN at a given section. Determine the shear stress distribution on the section. 15

Q 6(b) (i) vRwnrf ^ ftsjcr wTefT^r 3 ^ rt tr wm w 11 w ^ srcr
20 m t , eft WTWf^T ^ m3s_1 V<W I

WTcTT^T c P ^ = 1500 m

= o.02
W TO Wi ^ r n = 300 mm

‘A’ TR WSEL = 200 m

‘B’ ^T WSEL = 185 m

A booster pump is installed in the pipeline between two reservoirs. If the energy
added by the pump is 20 m, determine the flow rate in the pipeline in m3s_1.

Length of the pipeline = 1500 m

Coefficient of friction = 0.02

Diameter of the pipeline = 300 mm
. : WSEL of A - 200 m WSEL of B = 185 m 5

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Q. 6(b) (ii) % CM w f e r 3HWT Pi H (elfed WTOT $ PrTOf ':
f^^Tuf = 5000 m3s_I, 3cTFT - 1 : 2500
vm it = 4.50 m
^nPrrr ^ 11
Compute the shear stress acting on the river bed for the data given :
Discharge = 5000 m3s“1, River bed slope = 1 : 2500
Depth of flow = 4.50 m
Assume the river to be wide. 4

Q, 6(b) (iii) ^ $ 3^rf FlPr 9.0 m ? M&S WTT 0.12 11
TO - ^ T Y l t t e TT^jf 3fk PrWT^T cftsRTTI
A hydraulic jump has an energy loss of 9.0 m and the downstream Froude number
is 0.12.
Determine the initial depth and the discharge intensity. 6
Q. 6(c) (i) % fM P rw i
(ii) fe ^ ^IHlf^d I
(iii) TOTT ^TRTTT qR ^II I
(iv) ^ irfMcRT ^qqlRldl3Tt' fM I
(i) State the Abram’s law on water-cement ratio. 5
(ii) Name the various grades of ordinary Portland cement. 5
(iii) Define characteristic strength of reinforcing steel. 5
(iv) State any five applications of prestressed concrete. 5

Q. 7(a) (i) f^T tT3 ^ ^ Cv = 0.98 ? Cc - 0.62 i t eft, 3ifaPpr
& *\{ 5fTcf I ^rT : Vj = 2.006 m s -1, g = 9.81 ms-2 ft
m ^ Prsrf^r ^ tf^ r i
For the sluice gate shown in Figure, if Cv = 0.98 and Cc = 0.62, what is the height
of the opening ? Given V{ = 2.006 m s-1, g = 9.81 ms~2. Also determine the flow per
unit width. * 5

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Q. 7(a) (ii) ' 3tf^T ^riei) f^RT^t cTeft ^ s i{ 20 m ^ tii^
1(V) : 2(H) t , 3f Wt # WTTf 1.5 m i l tfeft ^ 1 x 10-4 f>1

¥^RTT ( w f a ) = 0.2 11 3PJ3WT (ST^T^fa) ^ t c T ^ ^
^ 3m TFT t I $ N > m W1 cjjffc^ui ^ |

The uniform flow depth is 1.5 m in a trapezoidal channel of bottom width of 20 m
with a side slope of 1(V) : 2(H). The bed slope is 1 x 10-4. Manning roughness
coefficient is 0.2. The downstream control raises the water surface by 3 m. Classify
the profile. 5

Q. 7(a) (iii) sfiW ^R ^TcT % M ^JZl f e l W I ;

% T i = 9 m , n = 0.017, S0 = 1 : 4000

D/S 7fi?rr( = 6.80 m, U/S WTlf = 3.6865 m, = 48.748 m3s_1

firm ftftr ^ h r ^r% ^ cF^rf P i^ iM i

Following data are given for a rectangular channel :

Width = 9 m , n = 0.017, S0 - 1 : 4000

D/S depth is 6.80 m, U/S depth is 3.6865 m

Discharge 48.748 m3s_1.

Using single step method compute the length of profile. 5

Q. 7(b) 9 ^f°T w s r ^ y r 3 ijwti rftrc f^m w t \ w *ft
0.4 m 11 cfT3[\i (w rjf) 12 m I ^ «Pbr t^ T 3 %Zl j t f
1.2 m 11 ^TTRPT (^t^upr) c - 50 kN/m2, ^TTT y = 18 kN/m3.
'• (i) =30 ^ «eTFF ^ # ) (ii)
^ 3m-3WT f^ R H tr 3rrmfer, (iii) w ^ I W t (*ttP r m yw
3f^PT $^dT a = 0.8)
f« - ' '( . ,
A pile, group consists of nine friction piles driven into a deep layer of clay soil. The
diameter of each pile is 0.4 m, the embedded length is 12 m and center to center spacing
of the piles is 1.2 m. The soil has cohesion, c - 50 kN/m2, unit weight, y — 18 kN/m3.
Determine (i) the block capacity of the pile group using a factor of safety = 3.0, (ii) group
capacity based on individual pile failure criterion and (iii) design capacity of the pile
groups (Assume adhesion factor a = 0.8) 20

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Q. 7(c) f^ r vm w t) w N pt I ^ -- .i- , • .

w fr f^rrT r, = 0.5 m •• >• . .

s r ^ f t ^R4)fl ft^rr r2 - 0.3 m

IcnRr^t v r ffc ^ (Pf) *ptt = 80°

w % ^ W? w f # = 0.25 m

^ ft 3TTC5 4 m3s_1 ^ WT t ^ W R 300 rpm 11

^ «cfc #*T p2 f^ra% Wft tf^Tcft W T f%W I

ZW^T 3 TTpft SKT ^ 3^T W Tff^T ^TTcJ^T I

TTT sTRI ^RTrr ^ WTeft cJMW^I 3^T qftu||i^^M ^rrf^f TTj^Tf I

^%¥T TT ^ ?R^T t sfft f^ ^ W*T ^ t I

A radial flow turbine has the following dimensions :

Outer periphery radius r{ - 0.5 m

Inner periphery radius r2 = 0.3 m

The angle made by the relative velocity at the inlet is (pj) = 80°.

The width of the flow passage between the two sides of the turbine is 0.25 m.

The flow of 4 m3s_1 goes through the turbine when the speed is 300 rpm.

Find theblade angle P2 such that water exit radially.

Find the torqueexerted by the water in the turbine and the power thus developed.

Find the head utilised by the runner and the power resulting therefrom.

Assume no shock at the entrance and blades are of negligible thickness. 15

Q. 8(a) f^ r 3 f^T ^ 3T<hi ^ z \z tr WTcT m ? wr $ ^ %

3TTO S fR fl^ r I TfT : H = 5 m, <|> = 30V C = 0,

p = 90°, hw “ 2.0 m, ysat = 18 kN/m3, ybulk = 17 kN/m3 (above water table),
q = 250 kN/m2.

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For the earth retaining structure shown in the figure, determine the total active thrust on

the wall, and the point of application of the thrust above the base of the wall. Given

H = 5 m, <)>= 30°, C = 0, P = 90°,\ - 2.0 m, ysat = 18 kN/m3, ybulk - 17 kN/m3 (above

water table), q = 250 kN/m2. 15
.q - 250 kN/m2

Ybulk = 17 k N / m 3

H = 5m <j>= 30°, C = 0

hw * 2.0 m Ysat “ 18 kN/m3

3

Q. 8(b)
u, u, u„ u« u. u,
-T f-

5m

fasr ^ u3L3, U3L2 L2L3 % M

For the truss shown in fig. draw the influence lines for force in members U3L3, U3L2 and

L,Lr. The load moves on the bottom chord. 15

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Q. 8(c) if ^ .if ^ 1 qifcL'j| ^ 4>lc1H % 4-<3-«l fa^cT %f^PT
ski to W 11 8 mm ttA^F tTT t 3ftr 6 mm web ^fT 11 ^ ^fW efts’ ‘W’
f^ rfM , w Tfe = Fe 410 200 mm ^ f\ TT ^?TT t- w ^ T $ $ I
A bracket connection shown in figure, consists of a joist cutting welded to the flange of
a column by shop fillet welds 8 mm on flanges and 6 mm on the web. Determine the safe
service load ‘W’, the bracket can support at a distance of 200 mm from the face of the
column if the steel grade is Fe 410. 20

250 mm

250 mm

TTFT f e f y W - 1.25
W ^ ^Rrrr = 250 MPa
Partial factor of safety on shop weld = 1.25
Yield strength of steel - 250 MPa

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