C.S.(MAIN) EXAM, 2009

CIVIL ENGINEERING

Paper II

Time Allowed Three Hours Maximum Marks 300

INSTRUCTIONS

Each question is printed both in Hindi and in EngliSh.

AnsWers must be written in the medium sPecified in the Ad"zission Certificate issued to you, which ,nust be stated clearly on the cover of the ansl-ver-book in the space provided for the purpose. No ,narks w· ill be given for the answers ·written in a mediu,n other than that lpecified in the Admission Certificate.

Candidates should attempt Question Nos. 1 and 5 which are cotnpu.lsory. and any three of the ren1aining questions selecting at least one question fro,n each Section.

The nunzber of marks carried by each question is indicated at the end of the question.

Notations/terms used have their usual meanings, unless otherwise indicated. If any data is considered insufficient, assunze suitable value and indicate the same clearly. Provide diagrams in the answer-book wherever necessary.

Section

1. Answer any five out of the following: 5xl2=60
What is 'pointing' Mention any four methods of pointing. 6
Explain in detru.1 the need and procedure for conducting water absorption test for coarse aggregate to be used in cement concrete 6

Write short notes on any three of the following construction equipment: Clamshell Hoe Tower Crane Trenching machine 12

Briefly discuss the Fulkerson rule of numbering events in a Network. 6
What is the difference between CPM and PERT in network analysis? 6

Draw a neat labelled sketch with dimensions showing the cross-section of a Broad gauge track for double line with electric-traction. 6
What is the intended purpose of rail List any ten requirements to serve the intended purpose of a rail. 6

Exp1ain any six salient features of Nagpur Road Plan. · 6
List Lhe eight factc:A-s which control the conventional methods of preliminary survey. Explain any two in detail. 6

List the ten precautions to be taken tn · Theodolite observations. 5
With a neat labelled diagram, classify the satelJites depending upon the inclination of the orbital plane with the earth's equatorial plane. 7

2. what are the functions and limitations of Break even analysis 10
Discuss any five basic parts of paint used in building construction. 10

What are the five different types of plasters and indicate the purpose(s) of plastering for Civil Engineering structures? 10
List the factors which affect the selection and use of crane in construction activity.10

The speed of overtaking and overtaken vehicles are 80 km/h and 40 km/h respectively on a two way traffic road. If the acce1eration of overtaking vehicle is I m/s2 I. calculate safe overtaking sight distance. II. mention the m1n1mum length of overtaking zone and m. draw a neat labelled sketch Qf the overtaking zone and show the positions of the sign posts. • (Overtaking zone ahead) • (End of overtaking zone ahead) Assume reaction time of driver as 2 sec.
A vertical summit curve is to be designed when two grades +Jo and-1o meet on a highway. The stopping sight distance and overtaking sight distance required are 200 m and 650 m respectively. But due to site conditions the length of vertical curve has to be restricted to a maximum value of 500 m if possible. Calculate the length of su1nmit curve needed to fuJfil the requirements of I. Stopping sight distance II. Overtaking sight distance or at least intermediate sight distance and discuss the results. 10

3. A construction machine costs Rs. 50.000/- and has an expected life of 5 years and salvage value of Rs. 7000/-. It is expected to work 2000 hours in a yeai·. Find out the yearly depreciation for the machine using sinking fund method. Assume that the deposits draw interest 12% per annum. 20

Determine the elevation of the top of a chimney from the observations given below <img src='./qimages/16-3b1.jpg'> The top of chimney and the stations A and 8 are in the same vertical plane. AB is l 00 m. If the RL of the BM is 100·000, determine the elevation of the top of the chimney. 5
Write the procedure of construction of simple curve when both the points of commencement and tangency are inaccessible. 10
With a neat·Iabelled sketch define I. Angle of deflection II. Point of commencement. iii. Long chord IV. Tangent distance 5

What would be the permissible speed on the curve, on a 8° broad gauge track The average speed of different trains is 60 km/h and the al1owable cant deficiency is half that of maximum cant deficiency. Comment on the speed limit. Assume suitable data as per Railway Board if required. 10
Write step by step procedure of measuring mid-ordinates or versines for starting lining the curves. 10

4. A cement concrete pavement slab of thickness 200 mm is constructed over a granular sub-base having modulus of reaction 15 kg/ cm2. The maximun1 temperature difference between the top and bottom of the slab during summer days and night is found to be 18°C. The spacing between the transverse contraction joint is 4·5 m and that between longitudinal joints is 3·5 m. The design wheel load is 5100 kg, radius of contact area is 15 cm, E-value of cc is 3 x IOS kg/ cm2, Poissons ratio is 0· 15, and the coefficient of thermal expansion of cc is lOxl0-6 per °C and friction coefficient 1s l ·5. Using the edge and comer load stress charts given by the IRC and the chart for the warping stress coefficient find the vorst combination of stresses at the edges. <img src='./qimages/16-4a1.jpg'> <img src='./qimages/16-4a2.jpg'>
The consolidated data collected from
speed and delay studies by floating car
method on a stretch of urban road of
length 4 km, running North-South are
given below. · Determine the average
values of volume, journey speed and
running speed of traffic stream along
either direction.
Direc- Journey Total No. of No. of No. of
tion time stopped vehicles vehicles vehicles
delay over- over- from
taking taken opposite
direction
<img src='./qimages/16-4a3.jpg'>
List the major limitations of Bar Chart.6
A building project comprises of seven
activities and the relevant data is given
below
<img src='./qimages/16-4b2.jpg'>
I . Develop the network and identify the critical path. .4
2. Identify float and slack. 2
3. Calculate variance for each activity.
4. Calculate standard deviation of the project. 4

For setting out a trunk sewer between
station A and B. following data was
made available.
Gradient of sewer 1 in 250 .
Depth of 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 2·30 m.
Height of collimation of the level set up nearby 250 ·00 m.
The length of ft'le staff rod 4 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
In the year 1940 a certain line had a magnetic bearing of S 67° 30 and then the magnetic declination at that place was 8°E. In 200 the magnetic declination was 4°W. Find the magnetic bearing of the line in 200 7. 4

Section

5. Answer any five out of the following 5x12=60

Outline brieny the concept of 'Groundwater Budgeting' and its importance in the determination of the safe yield from the basin. 1 2

Illustrate with the help of diagrams the basic three types of dam. Briefly mention the general design considerations to be folloved for its safety. 1 2

Show with the help of a suitable diagram the component parts of an irrigation canal system and briefly mention their respective functions.12

What is the significance of the following substances when they exceed the permissible limit in potable water Also mention the permissible limit for the same Fluoride. Nitrate, Nitrite, Chloride, Arsenic.12

How is the dissolved oxygen sag curve interpreted to indicate the critical point or the point of minimum D.O. 1 2

What do you mean by hydraulica11y equivalent section What are the parameters on which the cross-section of sewer would depend upon 1 2

6. A trapezoidal irrigation canal with side slope of l ·5 H to 1 V is proposed to be lined with I bricks to l"educe seepage losses. It is required to carry a discharge of 20 m 3 s of water. Find the wetted perimeter for mi nimum amount of lining and the required bed slope. The value of Manning's N is given as O·O 15 and it is stipu1ated that the average velocity cannot exceed 1 s. 20

A crop is irrigated V ith reclaimed waste water whose salinity measured by electrical conductivity is 1 ·0 mmho/ cm. If the crop is irrigated to achieve a leaching fr action of 0·20 i .c. (80 of water is lost thro ugh evapotranspiration) determine the fo llowing the salinity of the deep percolating water. the appropriate leaching fraction to maintain crop yield. The crop yield will suffer significant loss when IDS (total dissolved substance) of soil water exceeds 5000 Given TDS (mgll) EC (rnmho/ cm) x 640. 20 Explain the term B.O.D. Derive the expression for B.0.D. reaction. 20

7. The flood record for a period of 25 years of a small tributary of a main river has been analysed based on the assumption that the distribution is log-Nonnal. The mean • and standard deviation a of the · distribution have been fou nd to be 2·5 m3/s and l·O m 3/s. Find the magnitude of 100 and 1000 yr return period flood. 20

What are the various functional eJements of a solid waste management system Describe briefly the significance .of each functional element. 20
(c)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 of 24 hours. Draw a neat sketch of the septic tank so designed 20

8. <img src='./qimages/16-8a.jpg'> Determine using the 'rational form ula' with runoff coefficient equal to 0·80, the peak storm runoff to be carried out by the undergro und drainage pipeline AB for the drainage basin area of 0·2 ha· shown in the above figure. Take the length of pipeline as 100 m 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 en at end A as 2 min. Check whether the pi size is adequate or not. <img src='./qimages/16-8a1.jpg'>
Ta ble 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 a1so furnished the table. <img src='./qimages/16-8b.jpg'> Assume 30% losses of water in the entire canal system and 15% losses in the reservoir . Find the live storage of the reservoir in ha/ m. 20
Design a plain sedimentation tank to treat 4 million litres 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 flow as 10 cm/minute. 20


Note English version of the Instructions is printed on the front cover of this question paper.