EXAM, 2010
•
SI.. No.
166 IC-DTN-K-DFB I CIVIL ENGINEERING " Paper II
ITiJne Allowed Three Hours IIMaxil1llUn Marks 3001
INSTRUCTIONS
Each question "is printed both in Hindi and in English. An.Svers 111USt be lvritten· in the n1ediul1l­specified in the Ad,nission Certificate issued to you, 'which '111USt be stated clearly on th.e
cover of the answer-book in the space provided for the purpose. No nlarks will be given for the allSlvers written in a J11edili.NI other than that specified ill the Adlnissio1l­Certificate. Calididates should attempt Question Nos. 1 and 5 l'vlzich are c01npu!sor..y, and CU1Y three of the renlaini1l.g questions selecting at ieasl . one question froln each Sectioll.
The nUl1tber of 1narks carried by each question is indicated at the end of lite que.'iion. Notatiolls/tenus llsed have their 'usual nleanings, unless otherwise indicated. ifany data is considered insufficient, aSSU111e suitable value and indicate the sa1ne clearly. Provide diagranzs in the answer-book wherever necessary.
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Section

1. Answer any five of the following:
What is the purpose of dressing of stones? Mention the different types of surface finishes employed in stone masonry construction and illustrate by figures any two finishes. 6

(ii)What are the factors affecting the design and specifications of floor finish for residential rooms in a students hostel.

Mention the functions of each of bulldozer, scraper and hoe, and the site and job specifics for their use In the construction sector. 6

Mention the different bonds used in brick masonry and discuss In detail any two of them with figures. 6

The following table gives the data for the duration and cost for each activity in a CPM network. The indirect cost of the project is
Rs.90/day.Determine the optimum cost
and the corresponding duration of the project. Note that only the indicated durations are permissible and no intermediate durations are permissible. 12
<img src='./qimages/1036-1c.jpg'>

A 4-1ane National Highway is passing through a built-up area. Design the following geometric features for a horizontal circular curve of radius 350.0m for this Highway Consider design speed as 80 kmph and length of wheel base of largest truck as 6·0m.

Superelevation
extra widening of pavement
(iii)Length of Transition curve
Also suggest the most suitable shape of curve.

The following bearings were taken while
running a compass traverse. At what
stations do you suspect local attraction?
Find the corrected bearings.
<img src='./qimages/1036-e1.jpg'>

The following deflection angles were measured in running a traverse

<img src='./qimages/1036-e2.jpg'>
If the true bearing of AB is N62°18'E,
calculate the true bearings of the
remaining sides.


(i)define sleeper density.Calculate the
number of sleepers required for con­
structing a B.G.Railway track of 10·0 km
length, given the sleeper density as n+7.
Length of each rail is 12·8m. 6
Mention the relative merits and demerits
of F.F.and B.H. rails. 6

2. A project of 12 months implementation dura­
tion has been planned and the cumulative. cost
build up in "units of money" as by ESS and
LSS have both been separately estimated
as under with the cost build up starting
from "zero" at "zero" time and summating to
100 units of money at the end of the project
duration -for both schedules.
Values rounded to integers -Units of money
<img src='./qimages/1036-2a.jpg'>

Consider 1·2% p.m. compoundable monthly
for the evaluation.
What would be the excess interest involved on
the project cost as on completion date if ESS
were adopted in preference to LSS Adopt "a
month" as the unit time for this evaluation. 20



(i)Design and sketch the tie bars for a
cement concrete pavement for a longi­
tudinal joint using following data:

Slab Thickness 33 cm
Lane width 3·5m
Coefficient of friction 1·5
Density of concrete 2400kg/m3
Allowable tensile stress in plain bars =1250 kg/cm2
Allowable tensile stress in deformed bars 2000 kg/cm2
Allowable bond stress for plain bars 17·5 kg/cm2
Allowable bond stress for deformed bars 24.6 kg/cm2 10.

(ii)It is proposed to widen an existing 2-lane State Highway Section to a 4-1ane divided road. Calculate the cumulative number of standard axles to be carried during the design life of 15 years and

(ii)10 years in tenns of msa taking the following data:
Initial traffic in each direction 5600 cv/day
Design CBR of subgrade soil 6·0%
Traffic Growth rate 8·0%.
v.D.F. 4·5
Lane Distribution factor 0·75 10


What are the objectives of building bye-laws 5
Mention the factors affecting the selection of site for any general type of building. 5
Differentiate between the two items In each of and
Junction, Terminal Station

Gravity yard, Hump yard 10


Describe In detail the procedure for carrying out plastering in cement mortar on new and also old wall; discuss separately. 10
Briefly illustrate the details of (a)learn­to-roof. coupled roof, and collar roof. 5
What are the qualities of a good building stone? 5

(i)Enlist and sketch different types of pavement markings and explain their significance for safe traffic operation. 10

Speed observations from a radar speed meter are given below, giving data on speeds of subsidiary streams with the volume of traffic on each subsidiary stream. Calculate time-mean speed and space-mean speed. 10

<img src='./qimages/1036-3b2.jpg'>

How does the water cement ratio
affect the strength of concrete? 5
Mention the causes of failures of
reinforced concrete structures. 5

Two pegs A and B were 750m apart
across a wide river. The following
readings were taken with the same
levelling instrument:

Level Station Readings on
A B
A 1.·543 2·847
B 1·422 2·622

The error in the collimation adjustment of the level was 0·002 m per 100 m. Determine the true difference of level between A and B and the extent of refraction correction. 10

4.(a)(i)Discuss in detail the principles of site and office organisations in building industry. 10
(ii)Name the principal varieties of earth­moving machinery; and discuss the specific uses of any two of them. 10

Calculate the load stresses at interior, edge, and ,comer regions of a cement concrete pavement using Westergaard's stress equations using the following data:
Design wheel load =5100 kg
Modulus of Elasticity of concrete 3.0x105 kg/cm2
Pavement thickness 180 mm
Poisson's ratio 0·15
Modulus of subgrade reaction =6.0 kg/cm3
Radius of contact area 15cm 10
Discuss the requirements of materials, plants and equipment and the adoptable construction steps for Built-Up spray Grout. 10
is masonry work? Name different kinds of masonry and mention the principles to be observed in stone masonry exposed walls construction. 10
The scale of a photograph is 1·0 cm to 100 m. The photograph sIze is 23 cm x 23 cm. Determine the number of photographs required to cover an area of 15kmx10km, if longitudinal overlap is 60% and the side overlap is other conditions remaining same. 10

Section

5. Answer any five out pf the following:
Explain if, and, if so, how, the Muskingham method can be realigned into the concept of stage slope,method of flow computation in a river reach? If not explain why not? 12

(b)Explain the mutually interfering roles of post­jump height at a diversion headwork and normal depth of flow in the downstream channel. 12

small town with a population of 1000 persons is to be supplied water at 96 Ipcd. The demand of water during different periods is given as follows:
<img src='./qimages/1036-5c.jpg'>

Determine the balancing capacity of a service
reservoir.if pumping is done in blocks of
24 hours, the delivery rate being constant. 12
(d)draw a neat sketch of a service pipe connection explaining the functioning and requiretnents of the various parts in the connection. 12
(e)Detennine the BOD loading of an oxidation pond used for treating the domestic sewage of 20,000 persons when the water supply demand is 100 litres per capita per day. Assume a detention period of 6 days and BOD of sewage as 300 mg/l. The pond is to be 1·2 m deep. 12

Stating a use-oriented definition of water pollution, list the various sources of water pollution along with the major characteristics of each of the stated source. 12


Consider the following three mutually exclusive options of providing a cut-off under a weir with aprons on a permeable bed:
one only on the upstream end of the apron

one only under the toe of the weir
one only at the extreme downstream end of the apron.
Sketch (illustrating all resultant effects) the possible flow
net diagram in each of the three cases -showing
four of the flowlines nearest to the weir-cum-cutoff construction. 20

Differentiate between super-chlorination and break-point chlorination
Explain break-point chlorination with a neat sketch explaining the
types of chlorine form available in the various stages
of the break-point curve. What is the significance of residual chlorine? 10

(ii)Describe the step-by-step procedure used for
backwashing of a rapid sand filter.What is the significance
of the backwash time and backwash velocity? 10

What is Darcy's coefficient of permea­bility
How is it determined? Draw the necessary sketches. 10
(ii)Estimate the population equivalent for each of
combined system for 2000 prsons having 100 gm per capita
daily BOD on the assumption that the contribution of BOD
is 75gm per capita per day.

(b)80,OOO litres daily contribution of industrial wastes
containing 1000 mg/litre of suspended solids on the assumption
that the contribution of suspended solids is 50 gm per capita
per day. State clearly any other assumptions needed to be invoked. 10


<img src='./qimages/1036-7a.jpg'>

A part of a solid gravity dam (sp. gr. of mass concrete 2.64)
is shown in its cross-section. Take uplift factor as 0·7. Draw
a tabular statement for analysis of forces at a horizontal section
26 m below water level. No ice, wind or seismic forces need to be considered. 20 J f

What will be the diameter of a circular sewer to carry
a sewage discharge of 0·624 m3/s when flowing full at a slope
of l0 in l0,000. Use n as 0·012 in the Manning's formula. 10

(ii)In this sewer, what would be the dis­charge and velocity
if the proportionate depth is held at 0·4 Use the table given
herewith.
<img src='./qimages/1036-7b2.jpg'> 10

Write a note on river training in the
context of river pollution control at river
banks through a typical Indian city. 10
Discuss the phenomenon of self­
purification of streams.How can it be
evaluated and represented? What are the
factors that significantly affect the self­
purifying abilities of a stream? 10

Consider a trapezoidal rigid boundary
channel of 3 m base width with side slopes 1h to 1/2 v. with depth
of flow being l·2m, and
n 0·012, with adequate free board.Sketch
the shear stress distribution on the wetted
perimeter.Explain the facts of zero and
maximum.if both are so possible,shear
stresses on each of the side slopes and on the
bed­with reasons therefor. 20
Enumerate and discuss the various
factors that play a role in estimating the
per capita demand of water supply. Also
explain the implications if heavy metals
are present in concentrations above their "
permissible levels. 10
Explain the meaning of "sustainable
development" and its role in project
planning. Also discuss the appropriate­
ness of the "separate system of
sewerage" in India. 10

How would the radial flow in an open
well be determined under steady state
flow conditions when the aquifer is
unconfined, and confined? 10

Write short notes on each of:
Reflux Valve
Air-Relief Valve
Expansion joint
in a water supply distribution system. 10