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WorksheetsCOFFER DAM 16/05/20
Total questions: 15
Worksheet time: 11mins
Name
Class
Date
1.
coffer dam is a permenent structure.
a)
true
b)
false
2.
coffer dam is constructued for
a)
retain Soil & Water
b)
dry working area for workers
c)
to place grillage foundations
d)
all the given
3.
if the width of excavation required is narrow which type of coffer dam is preperablt
a)
single wall
b)
double wall
c)
ohio river type
d)
none of given
4.
pick up the incorrect statement for coffer dam
a)
water tight
b)
unstable aginst overturning
c)
construction cost is minimum
d)
pumping cost is minimum
5.
In order to prevent the embankment from scouring due to the action of water , side slopes of earthen dam on water side should be pitched with rubber boldours.
a)
true
b)
false
6.
__________ is the simplest form of cofferdam.
a)
Single wall cofferdam
b)
Earth-fill cofferdam
c)
Cellular cofferdam
d)
Rock-fill cofferdam
7.
When the area to be enclosed is large, it becomes essential to provide the _________ construction so as to give stability to the cofferdam.
a)
single wall cofferdam
b)
Cellular cofferdam
c)
Double wall cofferdam
d)
Suspended cofferdam
8.
_________ is useful when depth of water is about 6 metres to 10 meters.
a)
Wood or steel sheeting cofferdam
b)
Ohio river type cofferdam
c)
Rock-filled crib cofferdam
d)
Suspended cofferdam
9.
when the depth of water is from 4.5 to 6 m, the type of coefferdam used is
a)
single wall cofferdam
b)
Cellular cofferdam
c)
earth coffer dam
d)
Suspended cofferdam
10.
spacing between two guide pile in single wall coffer dam depends upon
a)
depth of water
b)
width of water body
c)
velocity of water
d)
all the given
11.
A __________ consist of timber cribs.
a)
Cellular cofferdam
b)
Suspended cofferdam
c)
Concrete cofferdam
d)
Rock-filled crib cofferdam
12.
side slope in earthen dam is
a)
1.5 : 1
b)
2:1
c)
a & b both
d)
none of given
13.
the figure indicates which type of coffer dam
a)
single wall cofferdam
b)
Cellular cofferdam
c)
earth coffer dam
d)
Suspended cofferdam
14.
the figure indicates which type of coffer dam
a)
single wall cofferdam
b)
double wall cofferdam
c)
cellular cofferdam
d)
Suspended cofferdam
15.
the sectional view in figure indicates which type of coffer dam
a)
Cellular cofferdam
b)
Suspended cofferdam
c)
Concrete cofferdam
d)
Rock-filled crib cofferdam
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