CS MAINS
CIVIL ENGINEERING
Paper-II

Time Allowed: Three Hours
Maximum Marks: 250


SECTION-A

What are the standards given in IS 456-2000 to product good quality concrete? Distinguish between Repair, Restoration and Rehabilitation.

Explain the significance of Stopping Sight Distance and overtaking Sight Distance. Calculate the values of Head Light Sight Distance and Intermediate Sight Distance for a Highway with a Design Speed of 65 km/hr. Assume coefficient of friction as 0.36 and Reaction Time as 2.5 sec.

How an area is measured using Planimeter? A rectangle has sides approximately 400 m and 250 m. If the Area is to be determined to the nearest 15 m2, what will be the maximum error permitted in each line and to what accuracy should the lines be measured? Assume equal precision ratio for each length.

Differentiate between Single Slip and Double Slip in Rails. If the tread diameter on both. the rails is the same, then show that the slip is about 0.029 m. per degree of Central angle for Broad Gauge (B.G.).

Draw the network for the following Project and indicate the event times and Critical Path.
Also find the Project Duration and Total Float for all Activities
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2a Write short notes on the above
Acid Attack
Sulphate Attack
Alkali Attack
on cement concrete. 15

Compute the Radius of Relative Stiffness of 15 cm thick cement concrete pavement from the following data
Modulus of Elasticity of Cement Concrete 2.1 x 105 kg/cm2
Poisson's Ratio for Cement Concrete 0.13
Modulus of Subgrade Reaction: 3.0 kg/cm2 and 7.5 kg/cm2. 15

2c
State the significance of 'Rate Analysis' in Estimating and Costing of Buildings. Calculate the quantities of Cement, Sand and Coarse Aggregate for preparing 1 cu.m of concrete of 1 2 4 proportion. Also calculate the no.of bricks required of size 20 x lO x 10 for constructing 1 m2 of Brick Masonry wall. Explain anyone method of Building Valuation.
20


What are the qualities of a good Brick Explain the tests to be conducted to judge the
quality of a Brick as per I.S. Code. 15

3b
The length and Bearings of a four sided traverse are as follows
AB 320 BC 440 CD 390 DA 513.8 m
AB N 45°15' . BC S 71°30' CD 30°15' DA N 66°44' W
Calculate the Area of the Traverse. 15

Q.
Differentiate between Flexible Pavement and Rigid Pavement. Calculate the equivalent C-value of a three layered Flexible Pavement Section having individual C-values as given below:
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20

4a
What is 'Seasoning of Timber' Discuss the different methods of seasoning of timber.
15
Q.
State the functions of sleepers in a Railway Track. Enlist the materials used for sleepers.
For a Broad Gauge (B.G.) track in Transition zone, in order to allow locomotives with a
maximum .permissible speed of 100 km/hr, calculate
Radius of curvature
Degrees of curvature
Super-elevation
Length of Transition.
20
Q.
Two points A and B having elevation of 650 m and 250 m respectively above datum, appear on a vertical photograph obtained with a camera of focal length of 250 mm and flying altitude of 2700 m above datum. Their correlated photographic coordinates are as follows:
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Detennine the length of the line AB. 15


SECTION-B
Q.

The difference between the level of catchment and a Service Reservoir is 150 m and the distance between them is 48 km. The Reservoir was originally constructed by a single pipeline designed to carry 0.26 m3/sec. It was later found necessary to increase the supply to 0.365 m3/sec and it was decided to lay another pipeline of same diameter along the first part of the length and cross connected. Calculate the diameters of the pipes and the length of second pipe. 10

Q.
The BOD of a sewage incubated for one day at 30°C has been found to be 110 mg/l. What will be the 5 days 20°C BOD? Assume Kl 0.1 at 20°C. 10

Q.
Define Air Pollution. Discuss the classification of Air Pollutants and effect of them on Human health. 10

Q.
What do you understand by Capacity-Inflow Ratio in regard to Reservoir Sedimentation? How life of a Reservoir is determined from C/I Ratio and Trap Efficiency 10

Q.5(e)
A field test for permeability consists in observing the time required for a tracer to travel between two observation wells. The tracer was found to take 10 hrs. to travel between two wells 50 m. apart when the difference in water surface elevation in them was 0.5 m. The mean particle size of the Aquifer was 2 mm and the porosity of the medium is O.3.
If the kinematic viscosity 0.01 cm2/sec, estimate:

The Coefficient of Permeability and Intrinsic Permeability of Aquifer.
The Reynolds Number of the flow. 10

6a
A Small Reservoir has the following Storage-Elevation relationship:
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A spillway provided with its crest at elevation 60.00 m has the discharge relationship as Q 15 where is the head of water over the spillway crest. Develop an Elevation v/s Storage relationship to be used for Reservoir Routing. Take (delta)t 6 Hrs. 15

Q.
What do you mean by the tenn Per Capita Demand? How is it estimated? The population of a locality as obtained from Census record is as follows
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Estimate the population of the locality in 2040 by Arithmetic Increase, Geometrical Increase, Incremental Increase and Rate of Decrease Methods. 20

Q.
Design an Alluvial Channel based on Lacey's theory from the following data
Discharge: 25 cumecs
Lacey's silt factor: 1.1
Side slopes 1/2 H to 1 V
Derive the Lacey's Waterway and Regime Scour Depth Formulae. 15

Q.
Discuss the significance of Nitrogen Content, BOD, COD, DO, Arsenic and Fluoride in Water Quality. 15

Q.
Design a Rapid Sand Filter unit for 4.5 MLD, with all its principal components. 15

Q.
What is Elementary Profile for a Gravity Dam Discuss its shape and derive the expressions for its Base width and stresses in it. Design the Practical Profile of a Gravity Dam of Stone Masonry from the following data:
R.L. of Base of Dam: 1250 m
R.L. of H.F.L. 1280 m
Specific Gravity of Masonry: 2.4
Safe Compressive Stress for Dam Material: 1200 kN/m2.

Q.
The following data pertains to the healthy growth of a Crop
Field capacity of soil 30%
Permanent wilting percentage 11%
Density of soil: 1300 kg/m3
Effective Depth of Root Zone 700 mm
Daily consumptive use of water for the given crop: 12 mm
For healthy growth, moisture content must not fall below 25% of Water holding Capacity between the Field Capacity and the Permanent Wilting Point. Determine the Watering Interval in days. 15

Q.
An Activated Sludge Tank is 30 m long, 9 m wide and has liquid depth of 4 m. The
influent sewage flow rate is 3.5 MLD. The primary effluent has BOD of 130 mg/l and
suspended load of 150 mg/l. The MLSS concentration in the Aeration Tank is
1800 mg/l. Calculate
BOD Loading in kg/Ha-m
F/M Ratio
Aeration Period
Sludge Age.

Q.
Give the classification of Energy Dissipators. State the situations in which Hydraulic Jump Type and Bucket Type Dissipators are recommended based on relative positions of Jump Height Curve and Tail Water Rating Curve. 15