ias mains civil engineering 2009

8/18/2019 IAS Mains Civil Engineering 2009

1/32

C. S

M A

IN )

EX

A M

, 2

00

9

S

l. No

.

5

C

DTN

J D

FB

CIVIL

ENGINEERING

Pap

er

II

Jnm

e

Al

low

ed:

Thre

e H

ours

Ma

ximu

m

Ma

rks

3 1

I

NST

RU

CTI

ONS

Eac

h qu

estio

n

is

prin

ted

bot

h

i

n

Hi

ndi

and

in

E

nglis

h.

Answers must

be

written

in

the

medium

sp

ecifi

ed in

the

Adm

i.41i f

~ :

3 t f ~

i i f q

;r ~

i l li

"ql"d


2/32

ection

A

1

Answer

ar:y fiv out of the following :

5xl2=60

a)

(i)

What

ts

pointing

?

Mention

methods of

pointing.

any

four

6

(ii) Explain in detail the need and procedure

for

conducting

water absorption test for

·coarse aggregate to be

used

in cement

concrete.

6

(b)

Write short notes on any thr of the following

construction equipment

:

(i)

Clamshell

(ii)

Hoe

(iii)

Tower Crane

(iv)

Trenching machine

12

(c)

(i)

Briefly discuss

the

Fulkerson rule

of

numbering events in

a Network.

6

(ii) What is the

difference

between CPM and

PERT

in

network

analysis

? 6

(d) (i) Draw a

neat labelled sketch

with dimen

sions showing the

cross-section

o a

Broad gauge track for double line with

electric-traction.

6

(ii) What is the intended

purpose

of rail ?

C-DTN-J-DFB

List

any

ten

requirements

to

serve the

intended

purpose of a rail.

6

(Contd.)


3/32

.

. ,

1

.

P,

...-,f

?:IK

'la i

t ~

14ir

@ 4

i iil

a

u


4/32

.

{c) i ) Explain any six salient

features

of

Nagpur Road Plan. 6

(ii)

List

the

eight

factt:A s

which control

the

conventional methods o preliminary

survey. Explain any two

in detail. 6

(I)

(i)

List

the ten

precautions to be taken

m

2. a)

Theodolite

observations. 5

(ii) With

a neat

labelled diagram, classify the

satellites depending upon

the

inclination

of

the

orbital plane with the earth s

equatorial

plane. 7

(i)

What are

the

functions and

limitations

of

Break even analysis ? 10

(ii) Discuss

any

five basic

parts

of paint

used

in building construction. 10

b)

(i)

What

are

the

five

different

types

of

plasters and indicate

the

purpose{s) of

plastering

for

Civil Engineering struc

tures

? 10

(ii)

List

the

factors

which

affect

the

selection

and

use of crane

in construction

activity.

10

C-DTN-J-DFB

(Contd.)


5/32

(i) ' i l• l : t 6i$Cfi 4'11' 1


6/32

c) i)

The

speed of overtaking and overtaken

vehicles

are 80 km/h

and 40

km/h

respectively on a

two

way traffic road.

If

the acceleration of

overtaking

vehicle

is

I

m /s

2

L calculate safe

overtaking

sight

distance.

II. mention

the

minimum length

of

overtaking zone and

Ill. draw a

neat labelled

sketch

qf

the

overtaking zone

and show the

positions

of

the

sign posts.

•

Overtaking zone ahead)

•

End

o

overtaking zone ahead)

Assume reaction time of

driver

as 2 sec.

10

ii)

A vertical summit curve is to be designed

when two grades

k

and Jo meet

on

a

highway.

The

stopping

sight

distance and

overtaking sight distance required are

200m and

6.50

m

respectively. But

due to

site

conditions

the length o vertical

curve has to be restricted

to

a

maximum

value o 500 m if possible. Calculate the

length of

summit

curve needed to fulfil

the requirements

o

C-DTN-J-DFB

L

Stopping sight distance

.

ll. Overtaking sight distance or

at least intermediate sight distance

and discuss the results. 10

6

Contd.)


7/32

(1l)

( i )

~

fiq; qta lqk l ~ < o < f i


8/32

~

<

.

3. (a) A construction machine

costs

Rs. 50.000/- and

has an expected life

of 5

years

and

salvage

value

o

Rs.

7000/-. t is

expected to work

2000

hours

in

a yeat·. Find out the yearly

depreciation for

the

machine

using

sinking

fund method. Assume

that

the deposits draw

interest @

12 per

annum. 20

(b) i}

Determine the elevation of the top

o a

chimney from the observations given

below :

.

tation

Reading

ngle o

on BM

elevation

A

I

2·870

28°42'

B

3·750

18°06'

The

top

of

chimney

and

the stations

A and B arc

in the

same vertical plane.

AB is 100m.

f the

RL o

the

BM is

l

00·000,

determine

the elevation o the

top of the chimney.

5

(ii)

\Vrite the procedure of construction

of simple curve

when

both the points

o comn1encement and tangency are

inaccessible. 10

{iii) With a

neat

·labelled sketch define

C-DTN-J-DFB

I

Angle

of

deflection

II.

Point

of commencement.

Ill. Long chord

IV.

Tangent distance

5

8

(Contd.)


9/32

3. (

l ' l < : l ~ f t o / 12%

aimct

{Z'l iR i

1rRT

q;'{

I

I.

R ~ Cf;T 41 01

II. CfiT

III.


10/32

c)

i)

What would be the permissible speed

on

the curve,

on

a go broad gauge

track

?

The average speed of different trains is

60

km/h

and the allowable cant defi

ciency

is half

that

of

maximum cant

deficiency. Comment on the speed limit.

4.

a)

Assume suitable data

Board if

required.

as per

Railway

10

ii) Write

step by step procedure of

measuring

mid-ordinates

or

versines

for

starting lining the

curves. 1

i) cement concrete

cc)

pavement slab o f

thickness 200 mm is constructed over a

granular sub-base having modulus of

reaction 15 kg/cm

2

.

The

maxunum

temperature difference between the top

and

bottom

of

the

slab during

summer

days and night is found to be

l8°C. The

spacing between the transverse contrac

tion

joint

is ·4·5 m and that between

longitudinal joints is 3 · m.

The

design

wheel

load

is 5100

kg,

radius o f

contact

area

is 15

em,

E-value of

cc

is 3 x l i

kg/cm

2

Poissons ratio is 0·15, and the

coefficient of thermal

expansion

of

cc

is

lOxlO-{,

per o and friction

coefficient

is

1·5. Using

the edge and corner

load

C DTN J DFB

10

Contd.)


11/32

•

(lll

I 10

I:% ~ j )

i j

fUICfil'lll

WI 3ll"&R, N t f ~ C f i l gfdfsi;l l l 'll"liCfi

15

kg/cm

2

~ .

'R

fchq1


12/32

C-DTN-J-DFB

stress

charts given

by

the

IRC and lhe

cha1-t for the warping stress coefficient

find the worst combination

of

stresses at

the edges.

I

J

1 I I I T I

P = 5 1 0 0 k g a = 15cm

E 3 10 kg I em IJ

0.1

S

)

I - I j I I

f\1 :

I

r K ~

3 kg/em

f

15

'-

·

r to

8

l

:

6

5

45

4(

«

E 35

u

I -.

(

~

~

•

s

........

:: .

.::_

[:'::

~

I

I

f

J

()

14

6 8

~ o

2

24

Slab

thickness hem

Edge Lo ad Stress

har t

( IRC)

12

(Contd.)


13/32

C-DTN-J-DFB


14/32

50

-

.JO

E

u

- - 35

J

if. 30

.,;.

5

s;

~ 20

J

15

10

-

0

~

I I I I I _I I I

P =

5100

kg a

-co

5 ern

w

' , ' • ; .

i''

'

r

~ 30 kg /em'

r-

r

r: ..

15

~

/:' 6

1 '1'--

....

I

b

•

14

16

18 20

22 24

Slab

thickness em

Corner

Load Stress

Cflar t ( IRC)

?

L-

·' '

0

LO

z

<

0.

8

c

"-

0.6

0

cr 0 4

.

-

2

:;;

0.

>

(

)

f_

/

?

0 2 4 6 8 10

I_

14

VALUES OF

LYil

A" D (wl

\Varping Stress Coefficient

C DTN J DFB

14

10·

(Contd.)


15/32

50

25

:

I

I

r

11111111

-

P ~ 5 1 0 0 k g . a ~ l : 5 c m

_

rZ'

~

3 10' kg t

1

cm:

\ ~

0/:5

[ ,

V

K ~ 3 ~ ~ g / ~ m

tg

r J;::;:;

f ~ ~

t---

r--:

4 16

18 20 :2

4

Slab

th.ickness, h em

Corner

Load

Stress hart

(IRC)

1.2

c

0

.0

z

<

0.8

~

u

"- 0.6

0

V

O

5

:;

0.2

>

v

if

00

I J

6 8

10 12

144

VALUES

OF LT 1

AND l y;/

Warping

Stress

Coefficient

C-DTN-J-DFB

15

10

(Contd.)


16/32

T

rip

No

.

j

I

I

3

4

6

7

8

\ii}

T

he

con

so

lida

ted

d

ata

c

oll

ect

ed

fro

m

s

pe

ed an

d

del

ay st

udi

es

b

y

flo

atin

g ca

r

m

eth

od

on

a

str

etc

h o

urb

an

roa

d

o

len

gth

4

kr

n. ru

nn

ing

No

rth

-So

uth

are

g

tve

n

bel

ow

. D

ete

rm

ine

t

he a

ve

rag

e

va

lue

s

o

v

olu

me

, jou

rne

y

s

pe

ed

and

mn

ni

ng

sp

eed

o

tr

aff

ic

str

eam

a

lon

g

eit

her

d

ire

cti

on.

Dir

ec -

Jou

rneJ

Tot

al

No.

o

No. o

N

o.

o

tion

ri

m e

s

lopp

ed

v

ehi

cles

v

eh ic

les

v

ehi

cles

d

elay

ove

r-

over

-

f

rom

taki

ng

r ke

n

o

p p o s

t ~

dlre

ctio

n

.m

in

.it

C

min

sec

N

S

6. 30

I 40

4

6

2

70

S N

7

. 20

1

,

50

5

3

180

S

6

. 50

I

20

4

3

28

0

S

N

7

. 50

)

10

3

200

·

N

S

6.

1

0

I

20

2

40

S

N

8

. 10

2.

2

0

6

ISO

N S

6.

30

I

40

4 4

300

S

N

7.

4

0

I

5

0

I

1

60

10

C

-D

TN

-J-

DF

B

16

Co

ntd

.)


17/32

f t

q

'

E

'\

@

Q

l

l

2

3

4

5

6

7

8

(

i

i)

d

'f

l

(

i

t

<

€

"

a

i

R

'J

l

1

1<

1

1

W

~

1

;;1'11

ai R

mf


18/32

b) i)

List the

maJor

limitations

o f

Bar Chart.

6

ii) A building

project

comprises

o f seven

activities

and

the

relevant data

is g1ven

below:

Estimated Duration

days)

Activity

ptimistic

Mo st likelv

Pessimistic

l ime

time

tin e

I

l

7

I

3

l

4

7

I- 4

6

2 5

l

I

l

3-

4

4 - 6

8

5 - 6

3

6

5

I.

Develop

the

network and

identify

the

critical path. 4

2.

Identify float

and

slack.

3.

Calculate

v n nce

for

each

activity.

4

4.

Calculate

standard

deviation

o f

the

project.

4

C DTN 1 DFB

8

Contd.)


19/32

( 1

S

)

i )

~

-

'<

f

li

G

i'

.1

~

W

I

~

:

C

-

D

T

N

-

J-

D

F

B

3

1

1

2 1

\

M t

~

(

f.

lr

i

f

i

f

)

f

§t

it

tt

ct

i<

tl

q

~

l

l

.

i

fu

1

6

fi

i<

••

h

i i

iii

'1

e

:

tQ

' fi

i

r

i

fi

iii

Q

J:

It

t

1

2

I

I

7

1

3

I

4

7

1

4

6

2

5

I

I

I

3

5

2

14

4

6

8

5

6

3

6

1

5

1

.

Cf

I rf

::

li1

<

'I

a

'1

1

a

ft

<

fu

C

f

'

1'

1

~

c

R

4

2.

t:(

fC

f

. af

t<

c

I

2

3

.

fs

t>

"1

1C

f

><

'fl

4 C

f>

T

9

fl

(O

I m

ff

c

I

4

4

.

q

f


20/32

(c)

{i) For

setting out a trunk sewer between

station A and B. following

data

was

made

available.

Gradient

of

sewer

l

in

250.

Depth

o

invert

at

lower

end A : .

2·650

m (below peg

A):

Distance between Section A

and

B :

75 m.

Staff

reading

on peg

A :

l-80

m.

Staff

reading

on peg B :

2-30m.

Height

o

collimation o

the

level

set up

nearby

: 250·00 m.

The

length

of

tfte

staff

rod : m.

Make necessary calculations for

fixing

the sight rails

at

A and B

Also write the

procedure

for fixing the

sight rails

to

the vertical posts. 16

(ii) In

the year 1940.

a certain line

had

a

magnetic bearing

of

67°30 'E

and

then

the

magnetic declination at

that place

was

8°E. In 2007. the magnetic declina

tion was 4 W.

Find the

magnetic

bearing

o the line in 2007. 4

C-DTN-J-DFB

20

(Contd.)


21/32

(


22/32

Section B

5. Answer

any ive

out of the following

5x12=60

(a)

Outline

briefly

the

concept

o

Groundwater

Budgeting and its importance in

the

deter

mination of

the safe yield

from

the basin. 12

(b) Illustrate with

the help

of

diagrams

the

basic

three types of dam. Briefly

mention

the

general

design considerations

to

e followed

for

its

safety.

12

(c) Show with the help o a suitable diagram the

component parts o an irrigation

canal

system

and briefly

mention

their

respective

functions.

12

(d)

What

is the significance o the fol1owing

substances

when they exceed the

permissible

limit in

potable

water

? Also mention the

permissible

limit

for the

same

Fluoride,

Nitrate,

Nitrite, Chloride. Arsenic.

12

(e) How is

the

dissolved

oxygen

sag curve

interpreted to indicate the critical point or the

point

o

minimum D.O.

? 12

(f)

What

do

you mean

by

hydraulically

equivalent

section What arc the parameters

on

which

the cross-section o sewer would depend

upon? 12

C-DTN-J-DFB

22

(Contd.)


23/32

• • •

~

5. Rktf'Mii' ~ 1 qj.,.

' 5xl2=60

(

q;)

•

>li

'*1

i


24/32

6.

(a)

A

trapezoidal irrigation

canal

with side slope

of

1·5 H to I V is proposed to be

lined

with

bricks

to

reduce

seepage

losses.

It

is

required

to carry a discharge

of

20 m

3

Is of

water.

Find

the

wetted

perimeter for

minimum

amount of

lining and the required bed

slope.

The value

of

Manning s N is

given

as 0·015 and it is

stipulated that the

average

velocity cannot

exceed I m/s. 20

(b)

A crop is

irrigated

with

reclaimed

waste water

whose salinity (ECw) measured by electrical

conductivir,y

is

1·0 mmho/ em. If the crop is

irrigated to achieve a leaching fraction

of

0·20

i c

(80


25/32

6. () 1·5 H R 1 v ~

f 5000

m g

it iii

q;ct I

~

I

fiffi :

TDS (mg/1)

=

EC (rnmho/crn) x

640.

20

{lT) B.O.D. 'IG"Cfirf42:dl t

ti'iSJlii

I

B.O.D.

9ktfsi;lll

~ a:i "''Cf>

J J O I > m f ~ I 20

C-DTN-J-DFB

25

(Contd.)


26/32

(b)

What

are

the

various

functional elements

of

a

c)

8.

(a)

solid

waste

briefly the

element.

management

system

Describe

significance

of

each

functional

20

Design a septic tank for a colony of 200

persons

with

daily

sewage flow of 135 litres

per

person

per

day.

Assume

a

detention

period

o 24 hours. Draw a

neat

sketch

of

the septic

tank so designed. 20

Drainage

basin

A

Pipeline

Determine using the rational formula

with

runoff

coefficient equal

to

0-80, the

peak storm

runoff to be

carried out

by

the underground

drainage pipeline AB

for

the drainage

basin

area of 0·2

ha

shown in the above figure.

C-DTN-J-DFB

26

{Contd.)


27/32

( ;,;r)

m 3Pffif'SC 9 ;;ia


28/32

Take the length o pipeline as 100m and the

level difference between A and

B

as 0·5 m.

Assume

initially

a pipe diameter

of 250

mm.

Consider Darcy-Weisbach

friction factor

f

0·015. The

rainfall

duration and

rainfall

intensity is

furnished in tabular form below.

Consider

time

of

n ~ at

end

A as

2

min.

Check

whether the piifl size

is

adequate

or

not.

Duration

Rainfall intensity

mins)

mm/hr)

2·0

122

2·5

108

3·0

97

3·5

89

4·0

82

4·5

77

20

C-DTN-J-DFB

28

(Contd.)


29/32

~ 1 ; ' J < u i ' l , ~ v 314'll\?

< ~ > T

afi•1a ~

3 1'*' f f l ~ " i i 44M ~ < r r ~ ; ; f t < r ~ I

3 qfu

fflll l

mins)

mm/hr )

2·0

122

•

2·5

108

3·0

97

3·5

I

89

•

4·0

82

4-5

77

20

C-DTN-J-DFB

29

(Conld.)


30/32

(b) Table below

furnishes the

kind

of

crop

irrigated from the water

of a reservoir by

means of

the canal system. The

data

about

these

crops are

also

furnished· in

the table.

Kind o

Crop period

Area under

wy o

crop

n da\ s

crops

n

ha

varer

in

I

the

field n

l

ha/cumec

I

olton

240 3000

1430

I

u a n . - ~ m c

365 2000

860

'

'

I

\\ heat

I

20

4000 2150

'

'

Rice

120

2000

860

I

.

Assume

30' 'o

losses

of water in the entire

canal

system and

15

losses

in

the reservoir.

Find

the live storage of the reservoir in

ha Jn.

20

(c) Design a

plain

sedimentation tank

to treat

4 million itres water

per day.

The detention

period

may be

assumed

as 6 hours and the

depth -may be

assumed

as 3·5 m. Assume

velocity

of

llow

as

I 0

em/

minute.

20

C-DTN-J-DFB

30

•


31/32

•

( 78)


32/32

I

DTN J DFB I

c4

I

~

' " " " ~

;;

tt

fl

Jfllt 300

3 l ' j ; ~ I T

9

ri)q; TII *

p f- 'P'

K

ai{4; Pt fifl' R

fii41

:.ifl f/

tiff;((

I P t ~ r - r:p;r

K

dfiCMn' a l fT;:q#[ it

alfflfht>

3FT fiifi/ 1'/TE:q#[ i f fr'nit

Tf1;

Tr:K R fi

lrr TIIrif it;

-iff< l'1

ias mains civil engineering 2009

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