ies conventional civil engineering 2010

www.examrace.com

--'&:1 c :=::.. .2-u l D ~ -- -.. {•0111 ~I ;lflftfJl ~ ~ ~~, ..... • • L. • •• • ••• •••..., Sa 1i neer in a Se. rvice B:a:am ina rioo. ·

Sl. No. 520~l I A-GUG-K-DFB'I

CIVIL ENGINEERING Paper II

(Conventional)

Time Allowed: Three flours

· remauung seve1 any FQ

Out of the

rries 40 marks.

The n.un.fbi{~o -rnarks carried by each . subdivisio1 o~q Vjuestio1i is indicated at the end

of the. b ivisionlquestion. Wherever a · questl n i at(e11tpted, all its ·subdivisions 11iust

...... ......__,~ .....

be atteucpted.

nswers must ·be written only in ENGLISII .

"SUllie suitable data, if found necessary, and indicate the same clearly.

Unless indicated otherwise, notations and sy1nbo/s have their usual ·nreanings.

Neat sketches to be drawn, wh~rever required.

(Contd.)

www.examrace.com

......... .. ..

1. (a) (i) FoiJowing data arc observed during testing of a Kaplan turbine : Power developed = 2500 k \Al, Head = 60 m and speed = ~50 ~·.p.m. W.hat will be the dimensionless specific speed of .the turbine ?

(ii) Determine the total pressure on a plane rectangular surface of 1 n1 wide and n1 deep whe.11 its upper edge is horiz fa I ~11~ coincides with water surface and ~a :tl l's held perpendicular to water u ·ac~ 2

(iii) The velocity components i at H y directions are given as u = ~ + y · nd v = x..:.... y respectively. Find h ~r these velocity c~mpo~lcnts sati.~~ o Sib1e t\vo dimenSional inc om " · -£S le flow or not ? - 2

(iv) · The diame of he impeller of a centri-fugal gu: n at . llet and outlet arc 20 em and tO respectively. Determine the ·

· n11g m starting speed of ·the pump . ~aa1 s a head of ~~ m. . . 2

(b) (1 · t d the probable hte of a reservotr with an . ttttial capacity of 4 x l 06 m3 if the annual

+ sediment inflow into. r~s~rvoir 4 x 1 0~ 1113.

The average trap eff1c1ency. 0·9 and hfe of . ·a reservoir is terminated when 90 per cent

. (ii) Fuid the wtdth of elementary grav1ty dam whose height is) 00 m. Specific gravity of dam material 2·2 arid seepage co-efficient at the base c = 0·8. 2·

2- (Contd.)

www.examrace.com

. (iii) An aquifer of 25 m average thickness is

overlain by an impervious layer of 30 n1 thickness. A test well 0·4 1n in diatneter and two observation wens at a distance of 12 tn aJ)d 48 n1 arc located in the aquifer. After pumping at a rate of 0·2 m3/ s for a long time; drawdowns in the wells wer· observed to be 3 · 5 In and 1· 5 m res ea tively. Determine the coefficient of per n1eability in an/ day.

(i ~) A conical tube of length 2 m \<erti-cally with its sn1al1er end . The vcloci ty head, pressure he a at pper ends arc 1·27 m and 2·50 'R · peetivcly. The velocity head and ~ -e~s r fl ead at lower ends arc 0·203 n no ·407 n1 respectively. Find the direc · t-1 o ow. 2

(c) (i) For a BOD £ t, ·r v sewage (3·0 ml) was diluted ~~ml (capacity of a BOD bottle) TtlU rluted sewage was observed for t ~ts:solvcd oxygen at the beginning ~~ ~ of 5 days incubation at 20°C. The ro~(tbve values were 8·6 mg/L and 4~ 1ng/ L. Determine the BOD of the raw sewage. . . 2

. ~ 11 A tnixed liquor with 2,000 n1g/L of sus-. pended solids has the settled vo]mne of

· 200 n11 from a l_itre of this mixed liquor. Ca1culate its sludge volume index. Is it safe? 2

(iii) If the alum dose to coagulate is 10 p.p.m.1 find out the amount of alUin (in quintals) needed to treat I 0 1nld of water. "\ 2

A-GUG-K-DFB 3 (Contd.)

www.examrace.com

(iv) For a population of 2 Jac having per capita daily demand of water of 150 litres, determine the water horse power to raise the water from a river of R.L. 120 n1 to treatment plant of R.L. 140 m through a rising main 1 111 in diameter. Assume .2m as th total head Joss due to friction, e~c. pumping efficiency of 70% ..

(d) (i) Estimate the value of coefficient meabiHty for a uniform · a d and of size D 10 = 0·15 mm ob ·n d ·f·om sieve ana)ysis. G = 2·61. 2

(ii) Calculate the a i

(iii) l!s\~- o e aghi theory find the uhiinate IS'e1i: · g,. 9apacity for a · square footing

f ·0 m x 2·0 m placed at depth of ....__ ,,_ n1 below the ground on a pure cohesive + soi] havit1g density 18 kN/m3· Nc = 5·7.

Use loc~l shear failure conditions. C = ......_~ 40kN/m.... · 2

~~~ (iv) .A Flow net is plotted for a homogeneous . earthen dam of _30·0 m height with a free

. board of 5·0 in. If K = 6 X I o-4 em/sec, No. of flow channels = 4, No. of potential

• •

drops= I 0, calculate the discharge per metre run of dam. 2

www.examrace.com

(c) (i)

01) Using Prismoidal Rule .calculate the v o~ of a 5 m deep pit whose top and o tto

dhneusions ·arc respectively x~O m and 20 tn x 40 m. 2

A power hous~ has 5 · in1pulsc turbines. Each turbine has two runners. Each runner is insla1led ~ith 4 nozzles. Total discharge is 40 m3-/ s. Find the diameter of jet. Take coefficient of yclocity as 0·985 an~ head as 250m. 4

www.examrace.com

(ii) A pipe canying water tapers from crosssection 0·3 1n2 at A to 0·14 m2 at lJ. The average velocity at A is 1·8 m/ sec: and pressure is 441 kN/m2 (gauge). If the frictional effects are negligible, deten11ine the pres~ure at B which is 5·5 ~1 above th Jevel of A.

(b) (i)

(ii) Draw surface profiles cases:

Steep sloped channel followed by a mild sloped channel. .

Mild sloped channel followed by a steep s1~pe9 channeL 4

(c) Explaining their qualitative differences in respect of total dissolved solids, turbidity and bacterial quality, suggest the units needed for the treat1net1t of water drawn fr01;1 (a) ground, (b) lake and (c) river. · 8

www.examrace.com

' (d) What will be the gross and net safe bearing · capacity of sand having ¢J = 39° and density 2·1 t/m3 below (a) 1·0 m wide strip footing

· (h) l·O.m x 1·0 m square footing p1aced at a depth of 1· 2 m below the ground. Take factor of safety as 2·5. Take Nc = 30·14, Nq = 18·4, Nr = 22·4. 8

(c) The observed altitude of {3-ursac Minoris lower and upper culminations are 29°5 ~

and 60°45'3~'- Find tlle latitude of the pia e o observat~on assuming t~e con·ectio ·· r reQ action to be equal to 57 x tangent o a parent zenith distance. 8

3. (a) (i) Show that the hydrosta fi r re remams invariant in a horiz n ' rane parall¢1 to free surface; 4

. (ii) A sudden enl· em t of a water pipeline from 200 n1 to 00 mm. The hydraulic gradient ri · y 10 nun. Estin1ate the dischd gc he pipe. 4

(b) (i) A neb rt sphere of specific gravity 8·0 (al ·n ~n oil of density 800 kg/m3. The di eter of the sphere is I 0 anm. The visco-

+ N-Sec. . · sity of oil is 7 ·848 , · Detcnninc the

. In-. tennina1 ve)ocity of n1etallic sphere. 4

bed slope 'S0 ' is mild or steep according s0

being less than or greater than

www.examrace.com

(c) Differentiate between a slow sand fi)ter and a rapid .. sand filter in respect of

(i) Mechanisms of removal of impurities, ~ (ii)

(iii) (iv)

• Cleaning process,

Effluent quality, Bed size in qualitative term.

(d) (i)

(ii) Discuss Pore pressure parameters.

In a 1aboratory vane shear test a

1 00 mm long and 60 mm dianle·--··-:..·.-.u· pressed into (G = 2·72). A

1 . tn " = 30·876 m, sin 1" =

206265

...,_\H:trizontal distance between A and B . ~~ = 6882·38 m

Angle of elevation from A ~o B = 1 °50'20"

. ......_~ Angle of depression from B to~= 1°51'10';

~~ Height of signal at A.= 4·145 m

Height of signal at B = 3·597 tn

Height of instrument at A = 1·463 m Height of instrument at B = 1·554 m 8

A-GUG-K-DFB , 8 · (Contd.)

www.examrace.com

4. (a) (i)

A five cy1inders reciprocating pump. raises the · water level by 150 m and the theoretical discharge is 0·20 rr?ts. The velocity in. the delivery pipe is 2·0 ·m/ s. Total head

Joss in pipes is 20 n1. What is the input ~ power, if the efficiency of the pump_ is

0·87? 40 . Two pipes of lengths 2500 m each <t' diameters of 80 em and 60 cn1 respectiv are connected in . paraHe). The · jct~n factor for each 'pipe is 4/ = 0· . otal flow is equal to 250 litres pe sec n . Find the ~ischarge in each pi . 4

. (b) (i) A 5·0 m wide recta~ula~anne1 catTies 15 m3/s of wat~r , i a~elocity of 6 1n/s. State whether 'tl ult jun1p is a possibj- · lity. If yes c f p e ~eight of.the jump and

powe~ d~SJPd · 4

(ii) A tr~~J channel with side slope

_....._.,~ .....

2 fl ts carryir:ag 25 tn3 /s. The slope of the lflnel bed is 1 in 800. Take Chezy's C ~.S and desig~ the channel. · 4

P. o much will be the settling velocity of a sp erical particle A (having specific gravily of 2·65) of diameter 10 x l0-3 cn1. Determine the , size for a floating spherjcat particle having a specific gravity of 0·80 (rising with the same velocity as that of. particle A). Assume kinematic viscocity of water as 1:012 x Io-2 cm2/sec. ·· 8

www.examrace.com

(d) In a conso1idation test done in laboratory a samp]c of 20 mm thick consolidated 50% in 15 minutes wHh double drainage. How much time a 5·0 m thick layer of same soil win consolidate 50% and 30% ? If the soil layer has a rock below, how much time it· will tak to consolidate 50% and 30%?

(e) The speeds of overtaking and ovc a ·e vehicJes are 80 kmph and 60 kmpA e. e tively. If the acceleration of the o. 'ertaking vehicle is 2·5 kmph per second calcu-a e the safe passing sight distance fa · i1tgle lane one way traffic (ii) three Ia B way traffic. Assume perception tim o dr~er = 2 sec. 8

5. (a) (i) A reaction tuli i h ing inlet diameter as 1·0 m ~ a ~ tat1cma·1 speed· 400 r.p.m. has flow. e· ·~5 m2 at the inlet and is workirt un er a head of 65 n1. Flow is rad'a t ~ outlet. Cotnpute the hydraulic

o e ~ and power devc·loped by the ~ taking velocity of flow at inlet as

n"'s~ m/s and ve]ocity of whirl at inlet as V 25·0m/s. 4

~ii) Find the critical depth for a discharge of 4 1n3/ sec for flow in right angle triangular channeL . . 4

(b) (i) Two reservoirs are connected by a pipe 100m long and 100 n1m in diameter fol1owed by another pipe 60 m long and 50 mm in diameter. The total head loss between the reservoirs is 10·3 m. Given f ;:;;; 0·03. co·n1pute discharge ncglecling minor iosres. 4

A-GUG-K-DFB

10 (Contd.)

www.examrace.com

(ii) The . velocity distribution within the

6. (a)

A-GUG-K-DFB (Contd.)

www.examrace.com

(ii) An oil having viscosity 0·08 Ns/m2,

specific weight 8829 N/m3, density 900 kg/m3 flows at the rate of 5·4 x lo-3 m3/s through a horizontal circular pipe of 0·12 m

(b) (i)

diameter and length 150 1n. Find (i) pressure difference in 150m lengt

kN/m2 0

(ii) wall shear stress in Nltn2 a~ (iii) average and maxin1um vel ~ city. 4

depth .of How in having side. slope

The BOD rate constant (k) for a river~s BOD ~ssimilation was determh1cd to be 2·0 day-1

· (base CJ. The BOD of this· river after leaving a · heavily populated town was detennined to be

50 mg/L. Determine the distance after which ... the river~s BOD wou1d becon1e 4 mg/L when . .... the average velocity of the river was· I m/scc. What would have been the K value if this distance would have been 300 km and stale what· K 1nanifests. 8

L.__ ____ - -

www.examrace.com

(d) A 6·0 m high retaining w"ll is to suppon a soil \Vith unit weight r = '17·4 kN/m3, ~ = 26° and c' = 14·36 kN/m2.·Determine the Rankine active force per unit ·length of wall before the tensile crack occurs.· Find the ctitical depth.

8 (e) A locon1otivc on B.G. track with four pairs of -----driving wheels each carrying axle load o

20 tonnes is required to haul a train at a sg€ed of 80 kniph. The train is made to .run ~ a level track with curval!Jre of io. Ca ate t e maximum permissible load that ca ul1ed

by the engine. Take hauHng o ac ty ! time

the Joad on driving wheel 8

7. (a) (i) Show that the mos ef i trapezoidal channel section s \a i regular hexagon

(ii) Design tt sition using Mitra's hyper- .. boti transltton given by

Be Bf Lf . . Bx- ( ) + ·Lf/Jc- Be- Bf X .

. . semi-cubical parabolic transition given by

~ ·· Given nominal bed width = ·25 111, width of flumed section = I 0·0 m and tota11ength of transition = 15·0 m. 4

A-GOG-K-DFI3 13 (Contd.)

www.examrace.com

(b) (i) The shear stress ~ in open channel depends on depth of flow y, velocity v, density.p~ surface tension a and acceleration due to gravity g. Using Buckingham's Pi Theorem, make out the dimensional analysis of the problem. ~

(ii) The depth of moisture in_root zone , ~ capacity and permanent wihin~o ~R r

. m depth of soil c;tre 0·5 m/m ar{~ O·~\'·m?n1 respectively. Compute the fie]~acity. and penn anent wilting p f. ¢fake dry weight of soil as 13· ~ LJ 3. 4

(c) On the basis of a detent1 riod of 24 hrs, determine the· size ( ss r:j.ng 1ength to width ratio of around· an epth of waste warer about J m) ot ~'e tic Tank required for a large house O\i ~n g 100 persons. The flow into the · ~ 1a I be assumed at the rate of 70 .lpc will be the surface loading and e~ len veir loading of the tank ? 8

(d) ·-~50 x 450 nun concrete pile 2.0·0 ·m long is " dnv. n into sand deposits wilh. Y = 17 kN/m·..,

an <!>' = 30°. Find the ultimate load ic point <foad QP by Meyerhoff's metl.1od and Janbu method.

. MeyerhofCs Nq' = 55, Atmospheric pressure ;;; 100 kN/m2, Janbu's Nq' = 18-4. 8

(e) (i) Fron1 the following. tidal data detcnnine the wave height and wave velocity for a non-translatory wave . Depth of water = 3 n1

Fetch = 800 km 4

A-GUG-K-DFB 14 (Conld.)

www.examrace.com

(ii) What are · the considerations for determining the thickness of concrete lining in a tunnel. Find out the concrete lining thickness for ~ tunnel with a bore diameter of 7·6 In. 4

8. (a) (i) Flood frequency computation yields following results:

Return Period Years

100·0

(ii) -Show th t P a p-late 10m x 5 m is towed throug: · ~ so that the boundary layer is 9iil:i'f I laminar~ the ratio of ,towi.ng sp6bffs so that the drag force rcmams to~tant regardless of whether 10 m or 5 n1 ~'ide is in the flow direction is given by

·u lOm = 1·2598

If the ·boundary layer is entirely turbulent ·and J{eynolds number is less than 107,

Uwm = 1·08. 4 Us rn,

A-GUG· K-DFH 15 : (Contd.)

www.examrace.com

(b) (i) A rectangular channel 15 m wide has a nonnal depth of 0·8. The discharge carried · is 10 m3/s, what is the alternate depth?

4 (ii)

(d) A re an u r foundation 6·0 m x 3·0 min size exert: pressure of 20 kN I m2 to the soil u ~9r eath. Compute the increase of vertical tn{ss at a point 0·5 1n below the centre of

foundation. Use Boussincsq equation. 8

Determine the ·radius of a taxiway for · a supersonic aircraft to neg~tiate the curve at a turning speed of 50 kmph. rhe wheel base is· 35 m and the tread of main landing gear is 7·~ m. -The airport is of type A as per ICAO. Assume co-efficient of friction between tyre and paven1ent surface as 0·13. 8

A-GUG-K-DFB 16

ies conventional civil engineering 2010

Documents

ies conventional-electrical-engineering-2012

ies conventional electrical engineering 2001

ies mechanical engineering conventional paper 2014

eee ies conventional solved papers of 2013

ies conventional civil engineering 2011

ies civil engineering paper ii 2013

conventional civil ii

ies obj civil engineering 2003 paper i

ies conventional electrical engineering 1992

ies civil engineeering conventional 2015

ies conventional-mechanical-engineering-2010

ies obj civil paper (1) 2009

ies conventional-mechanical-engineering-2009

ies conventional mechanical engineering 1985

2015 ies civil-i

ies conventional mechanical engineering 2011

ies civil engineering conventional paper 2014

ies civil engineering paper 1 2003

ies conventional-mechanical-engineering-2011

ies civil engineering 2009