IAS Mains Civil Engineering 2013
-
Upload
hemant-dhaked -
Category
Documents
-
view
218 -
download
0
Transcript of IAS Mains Civil Engineering 2013
-
8/10/2019 IAS Mains Civil Engineering 2013
1/21
fi4tfi J
ll/
DET
H LE
fflfe4t:t ~ ' i
1 l M 4 U (
~ ~ I )
C
I V I L E N G
I N E E R I N
G (Paper
I)
ff {
-
8/10/2019 IAS Mains Civil Engineering 2013
2/21
.
m
Cfi
SE
C
TIO
N
A
1 .
~ ~
~
r i
T
~
\ r
t
R
~
1
. a )
1.(b
)
l.
(c)
l
.(d
)
l.
(e )
A n
sw e
r
all f i
v
qu
est
ion
s :
~
~
m
i
t
~
~
~
~
~
~
20
0
CR
:
fs
tiq
+JI'i
'tFR
Cf
=
1 20
g
m
c r
r
m ~
u
ro
if
m
q?f
\j f
fi'fT
1
H+
i Ri
l
-
8/10/2019 IAS Mains Civil Engineering 2013
3/21
2. a)
2.(b)
2
.(c)(i)
2.
(c )( ii)
3. a)
w
p
c
~
~ ffii
r
~
~ q ; g : f u ~
~
1Jffi
31-- W (FBD) mm
I B
BC
C
31-'tt
D ~
cf
i ~
~
m m CfiT
~ 1W
m 1 t
{ CfiT
~ \ ' f r u l ~ ~
1
10
Draw free b
ody diagram
(FBD)
of
the
whole system as shown in the figure .
Neglec
ting self-weigh
tof its parts
A
B BC
C and
D
draw FBDs
of individual p
arts
also . The w
heel at is frictionless.
10
~ ~ m ~
~ ~ ~ ~ C I I
( 1 f k t d
mf
< f t
1 1 C h R ~ ~
~ ~ ~ C 8 8
~ t f K
~ ~
if l R CfiT qm
wm : Cl'4T
~ a n W
~ I
15
For the
semicircular
simply supp
orted
m
embe r shown
in the figure, fin
dthe value
of
bend
in g moment as
afunction of
8 and
also draw its b
ending momen
tdiagram .
15
cfiT
~ ~ 2 m 3fR 4 m e
f t ~
tR ~ ~ ~ T : 2 m/s
attt 3
m/s -.rr
q.
.-
N I ~ C
l i r q f ( C h ( 1
1 ~ I ~ ~
4 a
f R ~ F P I R i C h
~ ~ i l ) 0145
centi stok
e +
rR I cfi
? " 8 m cfi
~ = q
I
~ ~ fcRAr
~
?
a
r ~ c f i r ~
C l i r ~ ~ 1
15
The win
dvelocities we
re measured ab
ove a smooth p
lane ground su
rface at 2
m
an
d4 m
height
s as 2 and 23
m /s respective
ly. Compute t
he shear veloc
ity. Assume K
arman s
constant as 0
40 and kinemat
ic viscosity
of air as 0145 ce
nti stoke. What
is the velocity
at
8 m above
t he ground su r
face ? Calcula
te the probable
l aminar sublay
er thickness.
15
~ ~ ~ ? 1 ~
1 1 ~ ~ c r 3 f T C
f f u ~ ~ G I T - 9
C l i r a R R ~ ~
1 1 0 0 k m /
h r ~ ~ '
2mam:r
~ 3 0
m ~ ~ ~ 3ff C1RtR
C8
1 C8 1
'1
12
4
kg/m
3
3fR
~ 4 < 1
1 R t C h ~ ~
0
centis
to ke B-1
1
Distinguis
h between sur
face and form
drags due
to
a
fluid flow. Es
timate the ben
ding
m
oment at the b
ase of a 30 m
smoke stack 2
m in diameter
during a 100
km p er hour
wind. Assum
e the mass den
sity of the air
as 124
kg/m
3
and the kinem
atic viscosity a
s
015
c enti stoke.
1
:R
I
I
I
p
3
~ t p r c ~ m
i r ~ , ~
R a m : ~
w ~
m
l .. sz ~
GfR
P
I
DU
m
-
8/10/2019 IAS Mains Civil Engineering 2013
4/21
3.(
b)
1 2
0 0 m
~ ~ ~
~ 0
9 0 m
s ~
a f f
i : r
c r ~
t R 2
8 3 0
m
1
1:8
00
: J ? e
c r f m 1:
40
~ C
f i T
~ ~ f
~ \ i
f F I
T 5
4 ~ r
f 4 a
1
~ m
: r
~
~
~ ~
n
0
025
~ o
l
~ l
f R
~ f
i f
~
~ ~
? ~
~ f c
n c t
< I T
~ f ~
~ f c
r ~
~ ?
f d c n
1
1 cen
tis t
oke i
f I
1 0
A
shallo
w r
iver
has
a wi
dth
of 12
00 m
an
d co
nvey
s a
disch
arge
of
2
830
m
3
/s
at a
m e
an ve
locit
y of 0
90
m/s.
It is
propo
sed
to co
nstru
ct a r
iver
m o d e
l to a
hor
izont
al
scal
e
of
1
: 80
0 an
d a v
ertic a
l sca
le
of
1
: 4
0. f
M ann
ing 's
n fo
r th e
r iver
bed
mate
rial
is
00
25, w
hat
shou
ld b e
its v
alue
in
th e
model?
Verify w heth er th eflow in the m odel is
t
urbu
lent.
Assu
m e k
inem
atic v
iscos
ity as
11
centi
stoke
.
I 0
3
.(c)(i
)
90
0 mm
J i f C l l
z y m
r ~
~
15 m
3
/s
CfiT
Hffi C
OI
~
~ I
~ c
f i
r ~
10
mm
a
i R
~ ~
~ C
f
i T
~ ~
2 0
x
N m ~
i T 3 f
: r r r i
C f l 2 1
0 9
x 10
8
N
/m
2
~
~
c f i
t ~
3
5 k
m
a
T R ~ 3
f < O
~ c m q
- < 1
l l T ~
I
I(i
) c m
q
;:
s,{SlR::tl
cfiT
3Na
n
;:k
{SlRii if>
~
ff ilf
~ ? m
it
3
Til
~ )
c
fil ~
n ~
(HO
E)
31f't Cf
)
~
~
~ ?
s t l ~
G C f
H O
E ~
f n ~
l
fT7iT c
nT
~
"l \Ch ~ ~
I
H
OE) ~
m f
~
:q
-
8/10/2019 IAS Mains Civil Engineering 2013
13/21
b)
W
hat are
th
e advan
tages
of H
ydrau
lic E
xcava
tors o
ver othe
r types
of
excava
tors ?
Unde
r
w
hat c
ondi t i
ons
sho
uld
a
H
OE be
p
referr
ed
over
a
fron
t
s
hovel
? Dr
aw a s
chema
tic
sket
ch
illu
st ratin
gva
rious p
arts
of a
ty
pical HO
E List th
e facto
rsaffe
c t ing
the eco
nomic
a lc ho
ic e
of
a
HO E .
2
(a
) k
ct
cfiT
~
31Mcf)
crq i (f
':lll '1)
-cnT
C
fiB er
R CflT
{Cf
~ - c f i
i
~
?
I.S.
~
~ c f w q 1
( f ' : l
' 1 )
ct
fcr
fq
CflT
~
m rn
~ C \
~ I
C
b)
-q 3 1 f q
f B ~ ~ ~
-q
l c t i
*
- B -
~ fT;:r
c
n l
~ ~
~ ~
~ L Z I
c)
W TUT
~
l:K2fit