MPSC civil engineering questions

As you want to get question papers of Civil Engineering Examination of Maharashtra Public Service Commission, so here I am providing the following question papers:

MPSC Civil Engineering Exam Question Paper I

CIVIL ENGINEERING (Paper - I)

SECTION - A
1. (a) A reinforced concrete column is 230x300 mm in size. It is reinforced with six 10
bars of 16 mm diameter. The column is subjected to 800 kN load. Determine the
stresses in concrete and steel. Take modular ratio m= 13.
(b) A rectangular section for a beam is to be cut out of a log of wood 600 mm in 10
diameter. Determine the dimensions of the strongest section.
(c) A simply supported beam of span 'L' carries two equal point loads 'r at quarter 10
points from ends. Using conjugate beam method calculate cenhal deflection.
Flexural rigidity of beam is EI.
(d) Compare the load carrying capacity of columns with both ends hinged. 10
(i) Solid square section 40 x 40 cms.
(ii) Hollow square section with 50 crns outer side and 30 crns inner side. Use
1
Rankine's formula. Take a==% MPa, a= - 750.
Length of columns is 3.6 m.

(d) Find the deflection of the free end of cantilever beam ABC. Refer fig. 4. Take 10
EI = 60000 kN. m2.
Figure – 4

SECTION - B
3. (a) A beam AD of span 7.5 m is fixed at A and roller supported at D and has an 10
internal hinge at C at a distance of 3 rn from D. Construct influence lines for :
(i) Reaction at D, RD
(ii) Shear at section B, at distance 3 m from A, SFB
(iii) Moment at A, MA

(b) A two span continuous beam ABC is fixed at A and simply supported at B and C, 10
such that AB=4 m, BC=3 m. It is subjected to uniformly distributed load of
intensity 60 kN/m over entire span AB and downward concentrated load of
100 kN at midpoint of spar( BC. Analyse the beam by using stiffness matrix
method. Assume EI is constant throughout the beam.
(c) A laterally supported built up beam consisting of ISMB 400@ 61.5 kg/m and 10
plates of 200 mm x 10 mm each connected to flange, is simply supported over a
span of 4 m. The beam is subjected to a factored column load of 400 kN at centre
of span. Load is transferred through base plate of 200 mm length and 10 mm
thick. Clieck the beam for web buckling and web crippling. Take fy =250 MPa.
For ISMB 400 : t,,, = 8.9 mm, tf = 16 mm, Zp =1176.18 x lo3 mm3, rout radius
R= 14 mm.

(d) Design a welded plate girder to carry a superimposed load of 50 kN/m and two 10
concentrated loads of 200 kN each at one-third points of the span. The effective
span of the plate girder is 24 m. Assume that the girder is laterally supported
throughout its length. Use the tension field method. Take fy =250 MPa.
(Connections need not be designed)

4. (a) A three hinged parabolic arch, hinged at the springings and crown has a span of 10
20 m. The central rise of the arch is 4 m. It is loaded with a uniformly distributed
load of intensity 2 kN/m on the left 8 m length. Calculate the Normal thrust,
Radial shear and Bending Moment at 4 m from the left hand hinge.

(b) The towers of a 120 m suspension bridge are of unequal height. One is 15 m and 10
the other 5 m above the lowest point of the cable, which is immediately above the
inner pin of a three hinged stiffening girder hinged at the towers. Find the
maximum tension in the cable due to a point load of 100 kN crossing the bridge.

(c) A bracket transmits a load of 100 kN at an eccentricity of 200 mm to a column 10
through 8 bolts of 24 mm diameter arranged in two vertical rows 80 mm apart.
The pitch of the bolts is 80 mm and the load lies in the plane of the bolts. Calculate
the maximum stress in the bolts.

(d) Design a gusseted base for a beamxolumn ISSC 25W60.3 kg/m to transfer a 10
factored axial compression of 750 kN and a factored bending moment of 75 kNm.
The base rests on M30 grade concrete pedestal. Take fy =250 MFa.

SECTION - C
5. (a) A doubly reinforced rectangular beam is 240 mm wide and 500 rnm deep. If the 10
limiting stresses in concrete and steel are 5 N/mm2 and 230 N/mm2 respectively.
Determine the steel reinforcement for bending moment of 80 kNm. Assume that
steel is burried on both faces with its centre 40 mm from either face. Take m = 19.
Use working stress method.
@) Design a simply supported slab on masonry walls to the following requirements, 10
using limit state method
Clear span = 2.5 m
Live load = 3000 ~ / m ~
Use MI5 concrete and Fe 250 steel
Also draw plan and section showing reinforcement details.

(c) Design a square footing to cany a column load of 1100 icN from A 400 mm square 10
column. The bearing capacity of soil is 100 k ~ / m ~ . Use MI5 concrete and Fe
415 steel. Use limit state method. Show reinforcement details.
(d) Design a RCC short column to the following parameters using limit state method. 10
(i) Axial load =I200 kN.
(ii) Grade of concrete = M20
(iii) Length of column = 1.85 m
(iv) Grade of steel Fe 250.
Sketch the reinforcement details.

6. (a) Design a dog-legged stair case for a building in which the vertical distance between 10
the floors is 3.6 m. The stair hall measures 2.5 mx 5 m. The live load may be
taken as 2500 ~ / m ~ . Use M20 grade concrete and Fe 415 steel. Sketch
reinforcement details.

(b) Design a c i d a r tank with flexible base for capacity of 4 lakh litres. The depth of 10
water is to be 4 m, including free board of 200 mm. Use M20 grade concrete
Sketch reinforcement details.

(c) Check the stability of a counterfort retaining wall to retain 7 m high embankment 10
above ground level. The foundation is to be taken 1 m deep, where the safe
bearing capacity of soil may be taken as 180 k ~ / m ~ . The top of earth retained is
horizontal and soil weighs 18 k ~ / m ~ with an angle of friction 6-30", coefficient
of iriction between concrete and soil may be taken as 0.5. Use M20 grade concrete
and Fe 415 steel.
(d) A reinforced concrete beam AB of rectangular section is fixed at A and B. 10
Span =8 m. The beam carries ultimate udl of 24 kN/m. Design the beam bv limit
state method with 30% re-distribution ot moment. Use M20 grade concrete and
Fe 415 steel. Draw BMD envelopes.

SECTION - D
7. (a) Explain the various post-tensioning systems based on wedge action with neat 10
sketches.
(b) Define 'workability', and briefly explain the factors affecting thc w~orkability of 10
fresh conci.rte.
(c) A rectangular concrete beam, 300 mmx 900 mm with an overhang BC of 2 m is 10
simply supported at A and B over a span of 8 m. It supports a live load in addition
to its self-weight of intensity 3..52 kN/m over the whole span of 10 n ~ . Determine
the profile of the prestressing cable with an effective force of 500 kN which can
balance the dead and live loads on the beam. Sketch the profile of the cable along
the length of the beam.
(d) Explain, how the water cement ratio, ratio of cement to aggregate and maximum 10
size of aggregate influence the strength of concrete.

8. (a) List and explain the various types of loss of prestress in pretensioned and post- 10
tensioned members.
(b) Enlist the various non-destructive methods of testing the hardcmed concrete. 10
Explain in detail the pulse velocity method.
(c) The end block of a post - tensioned prestressed concrete beam, 300 mm wide and 10
300 mm deep, is subjected to a concentric anchorage force of 832.8 kN by a
Freyssinet anchorage of area 11720 nun2. Design and detail the anchorage
reinforcement for the end block.
(d) Enlist various methods of concrete mix design and briefly explain any two of 10
them.

SECTION - E
9. (a) Find the roots of the equation.
f(x)=x2-3x+2
in the vicinity of x = 0 using Newton - Raphson Method.
(b) Compute the integral
by applying Simpson's one third rule for n=4 with an accuracy of five decimal
places.
(c) Write an algorithm and flow-chart for solving a set of three simultaneous equations 10
using Gauss - Jordan Method.
(d) Solve the following equations by Relaxation Method.

10. (a) Using Trapezoidal Rule evaluate the integral
for the intervals (1, 2) and (1, 1.5). Also estimate hue error in each case with
respect to exact answer.
(b) Perform five iterations of the bisection method to obtain the smallest positive root 10
of the equation.
f(x) = cosx x e X = 0

(c) Draw flow chart for the computation of moment of resistance of R.C.C. beam. 10
Take width of the beam 'b', effective depth of beam 'd', permissible stress in
concrete is 'u cbc', permissible stress in steel ' s t ' and area of tensile steel is 'Ast'.
Width and depth of beam are in 'MM', permissible stresses are in 'MPa' and Area
of steel is in 'mm2' (Use Working Stress Method).
(d) Write a programme in 'C' or Fortran language to solve the set of simultaneous 10
equations using Gauss - Elimination Method.

MPSC Civil Engineering Exam Question Paper II

SECTION - A
1. (a) Explain use of tape to measure distance AB on sloping ground, as indirect method. 10
In chaining an area containing a pond two points C and D were selected on
either side of chain station A such that A, C, D lie on a line. The point B which
is on the other side of pond is on the chain line AB. If distances AC, AD, BC and
BD are 35 m, 45 m, 100 m and 95 m respectively, determine the length of chain
line AB and the angles which the inclined line CD makes with the chain line AB.
@) Why declination at a place does not remain constant ?
The true bearing of T as observed from station A was 358" and magnetic bearing
of the same was 8". FB of lines AB, AC and AD was found &be 290", 340" and
30" respectively. Find the true forebearing of lines AB, AC AD.

(F) E4~lain any five tests that you will perform to assess a plane table in prrfect 10
adjustment for accurate work. What adjustment will you recommend if the plane
table is not in adjustment ?

(d) Prove that, the area of the traverse is equal to the algebraic sum of the products of 10
the total latitude of each point and algebraic sum of the departures of the lines
meeting at that point.

2. (a) A dumpy level was set up midway between two pegs 80 m apart. The readings 10
on the staff at the two pegs were 3.2 and 3.015 m respectively. The instrument
was then moved by 20 m ahead of the second peg in line with two pegs. The
respective staff readings were 2.825 and 2.69 m. Calculate the staff readings on
the two pegs to provide horizontal line of sight.

(b) To determine the gradient between two points A and B, a tacheometer was set 10
up at another station C and following data was observed keeping staff vertical.
Staff at Vertical angle Stadia readings
If the horizontal angle ACB is 35" 20' determine average gradient between A and
B
K=100; C = 0
(c) A horizontal curve is to be set. Devise a suitable solution under following 10
situations :
(i) The point of intersection is not accessible
(ii) Both tangent point and point of tangency are not accessible.
(d) Explain the relation between height of the station above a datum and the distance 10
of the station from the point of tangency in case of geodetic surveying.
The elevations of two triangulation stations A and B 100 km apart are 180 m and
450 m respectively. The intervening obstruction situated at C 75 km from A has
an elevation of 259 m. Ascertain if A and B are intervisible. If not then by how
much should B be raised so that the line of sight must nowhere be less than 3 m
above the surface of the ground, assuming A as the ground station.

SECTION - B
3. (a) Explain the following vibrators used for compaction of concrete
(i) Internal vibrators
(ii) External or form vibrators
(iii) Surface vibrators
(iv) Table vibrators
(b) Discuss the structural shapes of common rolled steel sections used for construction 10
with examples [Figure for each shape is expected].
(c) State the reasons for artificial seasoning of timber. 10
Explain any four methods of artificial seasoning from the following methods :
(i) Water seasoning
(ii) Seasoning by boiling or steaming
(iii) Kiln or hot air seasoning
(iv) Chemical or Salt seasoning
(v) Electrical seasoning
(vi) Smoke drying
(vii) Charring or scorching
(d) State the essential and other ingredients of a paint or oilpaint. Discuss the essential 10
ingredients.

4. (a) (i) Give the distances of building line and control lines for ribbon development 5
along approaches specified by National Building Code for National
Highway, State Highway, Major district Road, Other district Road and village
road.
(ii) Enlist the different principles of planning. Explain "Aspect" principle for 5
different units of a residential building.
(b) Explain with a sketch 10
(i) Grease Trap
(ii) Intercepting trap
(c) Discuss the general principles and factors in Acoustical design of a Cinema Hall. 10
(d) Explain the general measures of fire safety that have been recommended in 10
buildings
(i) Alarm system
(ii) Fire Extinguishing Arrangements
(iii) Escape Route (means of escape)

SECTION - C
5. (a) Explain with neat sketches different types of Ashlar masonry. 10
(b) Explain in brief the factors that affect the selection of flooring material. 10
(c) Briefly describe, with neat sketches, the various types of pointing. 10
(d) What are the different causes of dampness in a building ? Enlist different methods 10
of prevention of dampness in a building.
6. (a) State purpose of rate analysis and explain in brief factors affecting rate analysis. 10
(b) Explain briefly the situations when lowest tender is rejected. 10
(c) What is meant by a 'Contract'? What are the essentials of valid contract ? 10
(d) Explain constant percentage method to calculate depreciation. Find out book 10
value of a construction equipment after 5 years costing Rs. 80,000/-. Assume life
as 8 years and the salvage value Rs. 8000/-. Use constant percentage method.

SECTION - D
7. (a) Define voids ratio, porosity, degree of saturation with respect to soil mass. 10
Derive the equation es, = wC,
@) Enlist the assumptions made by Boussinesq in his theory for the problem of stress 10
distribution in soils due to a concentrated load.
And with a neat sketch explain stress isobar and its significance
(c) Explain the following terms in connection with shear tests on soil sample 10
(i) Undrained test
(ii) Consolidated undrained test
(iii) Drained test

A cylinder of soil fails under an axial vertical stress of 160 kN/m2, when it is
laterally unconfined. The failure plane makes an angle of 50" with the horizontal.
Calculate the value of cohesion and the angle of internal friction of the soil.
(d) Define optimum moisture content. What is the effect of increase in compactive 10
effort on optimum moisture content for a given soil. Explain it with a neat sketch.
A cohesive soil yields a maximum dry density of 18 kN/m3 at an OMC of 18%
during a standard proctor test. If the value of G is 2.7, what is the degree of
saturation ?

8. (a) State any five assumptions made in Terzaghi's theory of consolidation. 10
An undisturbed sample of clay 24 mm thick consolidated 50% in 22 minutes
when tested in laboratory with double drainage. The clay layer from which the
sample was obtained, is 5 m thick in the field. How much time will it take to
consolidate 50% with double drainage ?

(b) Distinguish between active earth pressure and passive earth pressure. 10
A 5 m high retaining wall has a granular backfill with a level top. The retaining
wall face makes an angle of 85" with the base. Soil parameters r, b and S are
16 k ~ / r n ~ , 35" and 10" respectively. Using Columb's method obtain active thrust
on the wall.

(c) State the characteristics of bearing capacity failures namely general, local and 10
punching shear failure, with neat sketches.
(d) Define critical depth of a slope.
A long natural slope of cohesionless soil is inclined at 13" to the horizontal. If 10
4 = 30" determine the factor of safety of the slope.

SECTION - E
9. (a) A construction equipment was purchased in Rs.12000/- (Rs. Twelve thousand). 10
Assuming its salvage value at the end of 6 years to be Rs.3000/-, determine amount
of depreciation for each year by
(i) Straight line method
(ii) Constant percentage method
[show the answer in the following format ]
Format
Book value at the

Age in years Depreciation Total depreciation
(b) Discuss the advantages of following hammers used as a pile driving equipment 10
(i) Drop hammer
(ii) Single acting steam hammer
(iii) Double acting steam hammer
(iv) Diesel hammer
(v) Hydraulic Hammer

(c) While submitting a proposal for construction of a building, service plan is also to 10
be submitted to the local authorities.

Which points are to be submitted in this service plan ? Explain each point.
(d) A project consists of following activities. 10
(i) Draw the network.
(ii) Find out critical path and project duration.
(iii) Calculate Free Float and Independent Float for non critical activities.

10. (a) Explain the safety measures to be adopted on worksite for demolition of a building. 10

(b) A PERT project consists of following activities with their duration. 10
1 Activity Optimistic time I Pessimistic time ( ~ o s t likely time I
in days (to) in days (tp) in days (tm)
18 9
Find out the probability of completion of project in 37 days
[For Z = 1, probability 84.13%
For Z = 2, probability 97.72%]

(c) Describe the stages of inspection and quality conh-01 for
(i) Earthwork
(ii) Masonry
(iii) Reinforcement in RCC
(d) Who is the father of scientific management ? State and explain salient features of 10
scientific management.

MPSC Civil Engineering Exam Question Paper III

SECTION - A
1. (a) Differentiate between cohesion and adhesion by gving one example for each. 10
Two capillary tubes of diameter 1.50 mrn and 3 mm are dipped in oil of surface
" tension 0.036 N/m and specific weight 9300 ~ / m ~ . Find the difference of oil
levels in the two tubes. Assume contact angle of 25".

@) List and briefly explain the limitations of Bernoulli's theorem. 10
The diameter of a vertical tapering pipe at sections A and B, 1.5 m apart are
150 mm and 75 mrn respectively. Section A is higher than section B. For a certain
discharge of water down the pipe, the pressure head at B is greater than pressure
head at A by 0.5 m and the loss of head between the two sections is hL. When the
same quantity of water flows up the pipe the pressure head at B is greater than
pressure head at A by 0.8 m and the loss of head between the sections is found to
be 2hL. Find the value of tius discharge . What is the value of hL ?

(c) Explain the significance of Reynold's Number in pipe flow. 10
A spillway model is to be built to a geometrically similar scale of 1/50 across a
flume of 60 cm width. The prototype is 15 metres high and maximum head on
spillway is expected to be 7.5 m. If the flow over a model at a particular head is
12 litres per second, what flow per metre length of the prototype is
expected ?

(d) List the criteria on which turbines are classified. Also differentiate between reaction 10
and impulse turbine.
A centrifugal pump delivers water against the net head of 14.5 metres and at a
design speed of 1000 rpm. The vanes are carried hack at an angle of 30" along the
periphery. The impeller diameter is 300 mm and the outlet width is 50 mm.
Determine the discharge of the pump if the manometric efficiency is 95%.

2. (a) Explain the conditions required for stable, unstable and neutral equilibrium of a 10
floating body.
The velocity components in a two dimensional flow field for an incompressible
fluid are as follows.
Obtain an expression for the stream function $.
(b) Explain the concept of 'Most economical channel section'. State the conditions 10
required for rectangular and trapezoidal channel sections to be most economical.
Water flows through 150 mm diameter pipe AB 400 m long. The point B is 20 m
above A. The discharge through the pipe is 0.02 m3/sec from A to 8. Find the
pressure at A if the pressure at B is 200 kPa. Take f =0.006.
(c) What is the cause of boundary layer separation ? Briefly explain any one method 10
of avoiding boundary layer separation
A 400 tnm diameter concrete pipe 4100 m long conveys water at the rate of
10000 m3 per day. If the pipeline is gradually closed by a valve at the downstream
end in an interval of 15 seconds, show that there is a risk of pipe burst. Assume
test pressure of concrete pipe as 25 m of water.
(d) With a neat sketch show the general layout and section of a high head hydroelectric 10
power house. Also name the components.
A single acting reciprocating pump, with one cylinder has the following
cliaracteristics : Diameter of cylinder 20 cm, stroke length 40 cm, discharge
6 litre/sec, suction head 4 m, delivery head 20 m, rpm 30.
Find the energy required to drive the pump.

SECTION - B
3. (a) Enumerate the different types of rain gauges and descrik with a neat sketch the 10
construction and function of the non-recording type of rain gauge.
(b) What is meant by 'stream gauging' ? Describe the velocity area method used for 10
stream gauging.
(c) A loam soil has a field capacity of 25 percent and wilting coefficient of 10 percent. 10
The dry unit weight of soil is 1.5 g/cc. If the root zone depth is 60 cm, determine
the storage capacity of the soil. Irrigation water is applied when moisture content
falls to 15 percent. If the water application efficiency is 75 percent, determine the
water depth required to be applied in the field.

(d) A 0.5 m diameter gravity well is being pumped at a steady rate of 1500 lit/minute. 10
The drawdown of 6 m and 2 m was observed in nearby test wells at distances of
6 m and 16 m from the well being pumped after a steady state is reached. Assume
the well to be fully penetrating. The bottom of the well is 100 m below the
undisturbed ground water table. Assuming that all observed points lie on Dupuit's
curve compute the drawdown in the well being pumped.

4. (a) What are the different types of cross drainage works that are necessary on a 10
canal alignment ? State briefly the conditions under which each one is used.
(b) What are the different methods of reducing seepage in earth dams ? Explain with 10
sketches.

(c) The average rainfall values over a catchment in three successive Zhour intervals 10
are 3, 5 and 2 cm, respectively. The 6 index for the catchment is taken as
0.2 cm/hour. The 2 hour unit hydrograph ordinates are given in table below.
Base flow can be taken as 7 m3/sec at the beginning of the storm linearly increasing
to 9 m3/sec at 10 Hrs. after the beginning and then linearly decreasing to
8 m3/sec at 4 Hrs. after the end of direct run off. Compute the resultant flood
hydrograph.
Time in Hrs. 1 0
(d) What are the principal causes and effects of water logging in a canal irrigated 10
farm ? What precautions will you adopt to prevent water logging ?
SECTION - C

5. (a) Discuss the method of conducting CBR test in a laboratory. How will you apply 10
the correction to load penetration curve ? What will be the effect of lateral
confinement on CBR value ?
Discharge m3/sec
@) Write short notes on :
(i) Equivalent single wheel load
(ii) Equivalent load factor 5
4
0
(c) Why extra widening needs to be provided on a horizontal curve ? 10
12
Calculate the total width of pavement on horizontal curve for National Highway
in plain area with a ruling minimum radius. Use following data for the design :
6
10
Design speed = 100 km/hr
14 8 1 1 0
Pavement width on straight portion = 7.0 m
16
Number of lanes = 2.
40 70
Wheel base of truck = 6.10 m.
20 50
Ruling minimum radius = 360 m
(d) What is camber ? Discuss different types of camber and its limiting value for 10
different Road types.
10 6 0

6. (a) Discuss the classification of subgrade soils as per revised PRA system of soil 10
classification.
(b) Design the flexible pavement section as per IRC-37-2001 for 1300 commercial 10
vehicles per day. The rate of growth of traffic is 8% and three year's are required
for construction of pavement after last count.
Assume CBR value of subg~ade soil = 5%
Lane distribution factor = 0.75
(c) What is super elevation ? Why is it required to provide on horizontal curve ? 10
Derive the expression for equilibrium super elevation.
(d) The speeds of overtaking and overtaken vehicle are 80 km/hr and 50 km/hr 10
respectively on two lane road. If the acceleration of overtaking vehicle is
3.6 km/hr/sec. Calculate
(i) Safe overtaking sight distance
(ii) Minimum length of overtaking zone
(iii) Desirable length of ove~taking zone
(iv) Draw a neat sketch showing overtaking zone and position of sign post

SECTION - D
7. (a) What are various characteristics of an ideal site for a bridge across a river. 10
The maximum flood discharge under a bridge is 4775 mys. If the normal width
and waterway are 960 and 900 m respectively. Find out the scour depth and
afflux. The bridge is located in a moderate bend and the Lacey's silt factor is 1.0
velocity of approach is 2 m/s and coefficient of discharge C = 0.9, K = 1.5.
(b) Enlist the various loads, forces and stresses considered while designing bridges. 10
Explain briefly the traffic aspects of highway bridges.
(c) Explain briefly with neat sketches various shapes of tunnel. 10
(d) What are the various methods of tunnelling in soft ground ? Explain with neat 10
sketches.

8. (a) Define Afflux and write Merriman's and Molesworth's formula for determination 10
of afflux.
The catchment area of a river is 12000 ha. The length of the catchment area is
24 kms and the fall in level from critical point to the bridge is 168 mts. The soil of
the catchment is loamy with light covered vegetation cover. Find the peak runoff
to design a bridge, if the severest storm yielded 20 cm of rain in 5 hrs. Coefficient
for losses due to absorption and rainfall are 0.4 and 0.7 respectively.
(b) Explain various methods of erection of steel girder bridges with neat sketches. 10
(c) What do you mean by ventilation of tunnel ? Explain various methods of tunnel 10
ventilation
(d) What is mucking ? Enlist the equipment used for this purpose.
Explain various types of permanent drainage systems in tunnel

SECTION - E
9. (a) Draw a neat sketch and explain Tube settler. What are the advantages of tube 10
settler over plain sedimentation.
Design tube settler module of square cross section for following data
(i) Average output required from tube settler = 250 m3/hr.
(ii) Loss of water in desludging = 2% of output required.
(iii) Cross section of square tubes = 50 mm x 50 mm
(iv) Length of tubes = 1 m
(v) Angle of inclination of tubes = 60%
(b) (i) Explain the following sewer appurtenances with a neat sketch
(A) Inverted Syphon
(B) Drop Manhole
(ii) Calculate the diameter and discharge of a circular sewer which is half 4
full and laid down at a gradient 1 in 400 running with velocity of
1.9 m/s (Take n = 0.012)

(c) What is activated sludge process for waste water treatment 7 What are the 10
modifications of Activated Sludge Process.
The average operating data for a conventional activated sludge treatment is as
follows :
(i) Sewage Flow = 50,000 m3/day
(ii) Volume of aeration tank = 16,000 d
(iii) Influent BOD = 250 mg/lt
(iv) Effluent BOD = 30 mg/lt
(v) MLSS conc. = 2500 mg/lt
(vi) Effluent suspended solids = 40 mg/lt
(vii) Waste sludge suspended solids = 12,000 mg/lt
(viii) Quantity of waste sludge = 250 myday
Determine
(A) Aeration period in hours.
(B) F/M Ratio
(C) Percentage efficiency of BOD removal
(D) Sludge age.

(d) (i) What is meant by primary and secondary pollutants in Air pollution. 5
Give the examples of these pollutants.
(ii) Explain Ambient Air Quality standards with respect to noise as per the 5
Noise Pollution Rules, 2000. Also explain various terms in it.

10. (a) What is meant by disinfection ? 10
Enlist the various methods of disinfection. Explain chlorine as a disinfectant with
the reactions.
What is Breakpoint chlorination ? Explain breakpoint chlorination with graph

(b) Explain with a neat sketch D.O. Sag curve. State the equation to find out critical 10
D.O.deficit in the stream. Explain the various terms in the equation.
A stream is having a flow of 1 m3/sec and BOD 4 mg/lt is saturated with D.O. It
receives an effluent discharge of 0.25 m3/sec having BOD 20 mg/lt and
D.O. 4 mg/lt. If the average velocity of flow is 0.15 m/ser. Calculate D.O. deficit
at points 20 km and 40 km downstream. Assume that the temperature is 20°C
throughout and BOD is measured at 5 days. Take rate constants for effluent and
stream as 0.12 and 0.30 per day respectively.
Saturation D.O. at 20°C is 9.17 mg/lt.

(c) (i) What is meant by Inversion ? 5
What are the various types of inversions, occurring in nature ?
(ii) Draw a neat sketch and explain the working of electrostatic precipitator. 5

(d) What are the various methods of Landfilling of Municipal Solid Waste ? 10
Explain these methods.
What are the various ways to avoid ground water contamination due to leachate
coming out from landfill site.

__________________
Answered By StudyChaCha Member

Objective question for civil engineering mpsc