Exam Details
| Subject | civil engineering | |
| Paper | paper 2 | |
| Exam / Course | indian forest service | |
| Department | ||
| Organization | union public service commission | |
| Position | ||
| Exam Date | 2010 | |
| City, State | central government, |
Question Paper
CIVIL ENGINEERING
Paper-II
Time Allowed Three Hours IIMaximum Marks: 200
INSTRUCTIONS
Section-A
1. Answer any four parts of the following
What are the Harmful substances in brick earth?
What is efflorescence in bricks? What are its causes and remedies? 5
Mention the principal types of
dump trucks used in heavy
construction. Compare rear dump
and bottom dump trucks. 5
/20 P.T.D.
What are the objectives of channelisation with respect to road traffic? 5
Distinguish between stratified rocks and foliated rocks. 2Y2
What is meant by the natural bed of stone? Why is it necessary to set a stone along its natural bed?
What is the role of circulation diagram for of buildings? 5
Explain the following terms
Built-up Spray Grout (BUSG)
Cant DefiCIency
Present Serviceability Index
Electronic Distance Measurement Instrument
What is tacheometry?
What are the advantages of tacheometry?
Where is tacheometry application very useful? 10
2.. fa) Discuss the effect of calcium lignosulphonate and sodium hydroxide admixtures on cement. . 5
B-JGT-K-DJB/20 2
Discuss briefly the various effects of adding puzzolana to· cement concrete. 5
What is guniting? Mention the uses of guniting in construction 5
What is gel-space ratio? 2 1/2
What is Dutt-Abraham law? 2V2
Explain structural evaluation and functional evaluation of highway pavement. 5
Determine the loose volume of bituminous-mix required to be produced at hot-mix plant using the following data 5
Type of work-Pre-mix bituminous carpet, I• 25 mm thick to be laid by paver
Carriage-way width-one lane
Compacted density required =2300 kg 1m3 Loose density of mix 1600 kg/m 3
Speed of paver 0·3 kmph
B-JGT-K-DJB/20 3 P.T.G.
Following is the record of observations taken at stations Al CI D and E of a closed compass traverse ABCDEA by prismatic compass
Station Fore·bearing Back-bearing
A 80" 140"
B 90" 260"
C 120" 2690
D 2000 3010
E 3180 180
At what stations do you suspect local attraction? Calculate the correct bearings and included angles. 10
3. fa) A construction machine costs Rs 12,000 and has an expected life of 5 years and salvage value of Rs 2,000. It is anticipated to work 2000 hours in a year. Compute the yearly depreciation for the machine
usmg
the double-declining method; balance
sum of method. the years' digits
Rate year. of depreciation IS 200/0 per 5
Discuss In detail the role of benefit-cost analysis for selecting an alternative in civil engineering projects. 5
B-JGT-K-DJB/20 4
A maintenance project consists of the following 10 activities, whose precedence relationships are identified by their node numbers:
Activity Initial node and final node Duration (days) Activity Initial node and final node Duration (days)
A 1-2 2 F 4-6 6
B 2-3 3 G 4-7 2
C 2-4 5 H 5-8 8
D 3-5 4 I 6-8 7
E 3-6 1 J 7-8 4
ti) Draw the network.
fii) Calculate the earliest and the latest activity start times for each activity.
Identify slack for events and float for activities. 10
An existing roundabout has uniform weaving section, having following dimensions
Width =15 m
Length 50 m
Average entry width 8 m Future design hourly volume is 2150 vehicles per hour with 120/0 trucks. What shall be the available reserved capacity? 10
B-JGT-K-DJB/20 5 P.T.D.
Explain and distinguish between following terms with respect measurements in surveying: the to 10
ti) Accuracy
Precision
Error
Discrepancy
Mistake
4. For observations having equal weights, determine the most probable value of angle B from the following equations B 32°-30'-4011 3B 900 4B 1200 5
What are the factors affecting the selection of Front Shovel In construction industry? 5
With respect to distinguish between ternas road traffic, the following 6
Normal Traffic Growth Generated Traffic Growth Development Traffic Growth Current Traffic Growth
. Distinguish between a a map. mosaic and 4
B-JGT-K-DJB/20 6
Calculate the maximum permissible speed on curve of high-speed BG track having following data:
Degree of curve 10
Amount of superelevation 8 em
Length of transition curve 130 m
Maximum speed of the section likely to be sanctioned 153 kmph Assume maximum cant deficiency for high-speed track IDem. 10
A line PQ measures 12 cm on a photograph snapped by a camera with focal length of 22·5 em. The same line measures 4·0 cm on a map drawn to a scale of 4sboo' Determine the flying height of the aircraft, if the average altitude is 360 ID. 5
Discuss briefly the common cause of track derailment on curves and over crossing and turnout. 5
B-JGT-K-DJB/20 7 P.T.G.
Section-B
5. Answer any four parts of the following
Rainfall records of 100 years were scanned and it was found that the probability of a precipitation of 350 mm in a day is 0 -025. Find the probability of three precipitations of one day magnitude exceeding 350 rom in the next 15 years. 2
Thiessen's weights of 4 rain gauges C and D covering a river basin are 0 0 0·32 and 0·28 respectively. If the average depth of rainfall for the basin is 45 mm and the individual rainfalls at C and D are55mm, 40mmand45mm respectively, what is the rainfall at 2Y:z
What volume of water is required to be added to an evaporation pan of 1.22 m diameter placed in a catchment area experiencing 10 mm rainfall, the total evaporation on that day being 5 mm? 2lh
Calculate the rate of water to be released at the head of a sluice in order to irrigate 10000 hectares of land, out of which 20 percent is wastage. The duty of water is 800 hectares/ cumec. 2 V2
B-JGT-K-DJB/20 8
The cumulative depth of infiltration
in an experiment on a tube infil
trometer is given by the equation
F==O·2to. S5 where F is in
centimetres and t in minutes. Find
the equation for the infiltration rate
and also the average infiltration
rate. Calculate the respective
values at the end of 45 minutes. 5
Gross commanded area for a
reservoir is 75000 hectares, 800/0
is cultivable commanded area.
Calculate the reservoir capacity in
hectare-metres, if the canal losses
are 100/0, reservoir losses are
12 . 50/0. Other data are as follows 5
Crop Base period (days) Duty (hectares/ cumec) Irrigation intensity
Paddy 130 800 10
Wheat 120 1750 15
Cotton 180 1800 12
Sugarcane 360 1200 20
What is meant by coincident draft
and how is it used in estimating
design draft for design of
distribution system? 5
Explain any three methods of
estimating the future population
of a city. What are their relative
merits? 5
B-JGT-K-DJB/20 9 P.T.C.
6. ra)
Discuss the circumstances under
which the following types of pumps may be used 5
Reciprocating pump
Centrifugal pump
Airlift pump
Explain the significance of nitrogen and phosphorus from the point of view of water quality. 5
Explain the relationship between HOCI and OCI-occurring at various pH levels with the help of a suitable sketch. 5
A cofferdam is designed for a 30year flood and constructed. It takes 6 years to complete the main dam construction. What is the risk of the cofferdam failure before the main dam is completed? What return period in the design of cofferdam would have reduced the risk to 120/0? 5
Defme trap efficiency of a reservoir. What are the measures that are to be taken to control the sediment yield into a reservoir? 5
In a recuperation test on an open well, the water level was depressed by 4 m and it was observed to rise by 2·5 m in 90 minutes. What is
B-JGT-K-DJB/20 10
the specific capacity of the well? What would be the yield from the well under a depression of 3 if the diameter of the well is 7·5 5
Draw a neat sketch (plan) of a diversion scheme headworks showing all the components. 5
Following are the data of a canal fall
FSL =10m Bed level 7m •
Bed width 16 m Discharge;:; 45 cumecs Crest length of the fall =10 m (the cross-section being
rectangular) Coefficient of discharge 1· 7 Design fall crest. 5
ti) What is 'river training'? Draw neat
sketches (plans) of attracting spur . and repelling spur. 5
Write short notes on chlorination
f
and desalination. 5
In a continuous flow settling tank 3 m deep and 50 m long, what flow velocity of water would you recommend for effective removal of 0·025 mm particles at 25 ClC? The specific gravity particles is 2· 65 and the kinematic viscosity for water may be taken as
o.01em2 sec. 10
B-JGT-K-DJB/20 11 P.T.G.
7. The cross-section of a trapezoidal gravity dam has a top width of 5 bottom width 20 ill, height 30 fi, out of which 2 m is freeboard. Check the stability of the dam section neglecting uplift forces. 10
Draw neat sketches of different types of keys for shear resistance in 5
A homogeneous earthen darn is 22 m high and has a freeboard of 2 m. A flow net constructed indicates 12 potential drops and 4 channels. Calculate the discharge per metre length of the dam, if the coefficient of permeability of the dam material is 2·75 X 10-3 cm/s. 5 .. ..
What do you understand by a hydraulically equivalent section? Mention the conditions when two conduits are hydraulically equivalent. 5
In the context of emission of gaseous effluents from a chimney, briefly describe various types of plume behaviour with the help of suitable diagram(s). 5
Explain the term 'time of concentration' and its significance in design of storm sewers. 5
.B-JGT-K-DJB/20 12
The 5 days' BOD of a waste is
280 mg/litre. The ultimate BOD is
reported as 400 mg/litre. At what
rate is the waste being oxidised? 5
8. A weir has 50 vertical gates each of
9 . 75 m span, maximum reservoir
level 11· afi, crest level 6· 5
coefficient of end contraction for
piers =O· 021, coefficient of end
• • contraction for abutments 0 ·11, coefficient of discharge for the weir
1· 70. Compute the maximum
flood discharge which can safely
pass over the weir without
exceeding the full reservoir level.
Neglect velocity of approach. 5
The bed slope of an irrigation canal
is to be fIXed at the rate of 1 m in
5 Ian length, the average silt size
carried is 0·35 mm. Design the
cross-section of the channel using
Lacey's ...theory, when the side
slopes are 450 • 5
Ii) Define mass curve of a rainfall
and rainfall hyetograph. With neat
sketches, explain how the
hyetograph is derived from the
mass curve. 5
B-JGT-K-DJB/20 13 p.T.a.
The following flows are recorded in the driest year at a project site. Detennine the minimum capacity of the reservoir to allow the available volume of water to be drawn off at a uniform rate assuming that there is no loss of water over the spillway. Use arithmetic method 5
162, 150, 114, 102, 112; 190, 276, 332, 305, 257, 252) million metre 3 Draw a sketch of a grease trap and describe its working. 5 .. ... •
Compare the working of tank and an Imhoff tank. a septic 5
Explain the significance following heavy metals atmosphere of In the the 5
Cadmium, Lead Nickel, Mercury,
The mean concentration of S02 at •
STP in Delhi is 42 J.lg m 3. What is
the equivalent concentration m
ppm at 25°C and 1 atm? 5
B-JGT-K-DJB/20 14 BS-2200
Paper-II
Time Allowed Three Hours IIMaximum Marks: 200
INSTRUCTIONS
Section-A
1. Answer any four parts of the following
What are the Harmful substances in brick earth?
What is efflorescence in bricks? What are its causes and remedies? 5
Mention the principal types of
dump trucks used in heavy
construction. Compare rear dump
and bottom dump trucks. 5
/20 P.T.D.
What are the objectives of channelisation with respect to road traffic? 5
Distinguish between stratified rocks and foliated rocks. 2Y2
What is meant by the natural bed of stone? Why is it necessary to set a stone along its natural bed?
What is the role of circulation diagram for of buildings? 5
Explain the following terms
Built-up Spray Grout (BUSG)
Cant DefiCIency
Present Serviceability Index
Electronic Distance Measurement Instrument
What is tacheometry?
What are the advantages of tacheometry?
Where is tacheometry application very useful? 10
2.. fa) Discuss the effect of calcium lignosulphonate and sodium hydroxide admixtures on cement. . 5
B-JGT-K-DJB/20 2
Discuss briefly the various effects of adding puzzolana to· cement concrete. 5
What is guniting? Mention the uses of guniting in construction 5
What is gel-space ratio? 2 1/2
What is Dutt-Abraham law? 2V2
Explain structural evaluation and functional evaluation of highway pavement. 5
Determine the loose volume of bituminous-mix required to be produced at hot-mix plant using the following data 5
Type of work-Pre-mix bituminous carpet, I• 25 mm thick to be laid by paver
Carriage-way width-one lane
Compacted density required =2300 kg 1m3 Loose density of mix 1600 kg/m 3
Speed of paver 0·3 kmph
B-JGT-K-DJB/20 3 P.T.G.
Following is the record of observations taken at stations Al CI D and E of a closed compass traverse ABCDEA by prismatic compass
Station Fore·bearing Back-bearing
A 80" 140"
B 90" 260"
C 120" 2690
D 2000 3010
E 3180 180
At what stations do you suspect local attraction? Calculate the correct bearings and included angles. 10
3. fa) A construction machine costs Rs 12,000 and has an expected life of 5 years and salvage value of Rs 2,000. It is anticipated to work 2000 hours in a year. Compute the yearly depreciation for the machine
usmg
the double-declining method; balance
sum of method. the years' digits
Rate year. of depreciation IS 200/0 per 5
Discuss In detail the role of benefit-cost analysis for selecting an alternative in civil engineering projects. 5
B-JGT-K-DJB/20 4
A maintenance project consists of the following 10 activities, whose precedence relationships are identified by their node numbers:
Activity Initial node and final node Duration (days) Activity Initial node and final node Duration (days)
A 1-2 2 F 4-6 6
B 2-3 3 G 4-7 2
C 2-4 5 H 5-8 8
D 3-5 4 I 6-8 7
E 3-6 1 J 7-8 4
ti) Draw the network.
fii) Calculate the earliest and the latest activity start times for each activity.
Identify slack for events and float for activities. 10
An existing roundabout has uniform weaving section, having following dimensions
Width =15 m
Length 50 m
Average entry width 8 m Future design hourly volume is 2150 vehicles per hour with 120/0 trucks. What shall be the available reserved capacity? 10
B-JGT-K-DJB/20 5 P.T.D.
Explain and distinguish between following terms with respect measurements in surveying: the to 10
ti) Accuracy
Precision
Error
Discrepancy
Mistake
4. For observations having equal weights, determine the most probable value of angle B from the following equations B 32°-30'-4011 3B 900 4B 1200 5
What are the factors affecting the selection of Front Shovel In construction industry? 5
With respect to distinguish between ternas road traffic, the following 6
Normal Traffic Growth Generated Traffic Growth Development Traffic Growth Current Traffic Growth
. Distinguish between a a map. mosaic and 4
B-JGT-K-DJB/20 6
Calculate the maximum permissible speed on curve of high-speed BG track having following data:
Degree of curve 10
Amount of superelevation 8 em
Length of transition curve 130 m
Maximum speed of the section likely to be sanctioned 153 kmph Assume maximum cant deficiency for high-speed track IDem. 10
A line PQ measures 12 cm on a photograph snapped by a camera with focal length of 22·5 em. The same line measures 4·0 cm on a map drawn to a scale of 4sboo' Determine the flying height of the aircraft, if the average altitude is 360 ID. 5
Discuss briefly the common cause of track derailment on curves and over crossing and turnout. 5
B-JGT-K-DJB/20 7 P.T.G.
Section-B
5. Answer any four parts of the following
Rainfall records of 100 years were scanned and it was found that the probability of a precipitation of 350 mm in a day is 0 -025. Find the probability of three precipitations of one day magnitude exceeding 350 rom in the next 15 years. 2
Thiessen's weights of 4 rain gauges C and D covering a river basin are 0 0 0·32 and 0·28 respectively. If the average depth of rainfall for the basin is 45 mm and the individual rainfalls at C and D are55mm, 40mmand45mm respectively, what is the rainfall at 2Y:z
What volume of water is required to be added to an evaporation pan of 1.22 m diameter placed in a catchment area experiencing 10 mm rainfall, the total evaporation on that day being 5 mm? 2lh
Calculate the rate of water to be released at the head of a sluice in order to irrigate 10000 hectares of land, out of which 20 percent is wastage. The duty of water is 800 hectares/ cumec. 2 V2
B-JGT-K-DJB/20 8
The cumulative depth of infiltration
in an experiment on a tube infil
trometer is given by the equation
F==O·2to. S5 where F is in
centimetres and t in minutes. Find
the equation for the infiltration rate
and also the average infiltration
rate. Calculate the respective
values at the end of 45 minutes. 5
Gross commanded area for a
reservoir is 75000 hectares, 800/0
is cultivable commanded area.
Calculate the reservoir capacity in
hectare-metres, if the canal losses
are 100/0, reservoir losses are
12 . 50/0. Other data are as follows 5
Crop Base period (days) Duty (hectares/ cumec) Irrigation intensity
Paddy 130 800 10
Wheat 120 1750 15
Cotton 180 1800 12
Sugarcane 360 1200 20
What is meant by coincident draft
and how is it used in estimating
design draft for design of
distribution system? 5
Explain any three methods of
estimating the future population
of a city. What are their relative
merits? 5
B-JGT-K-DJB/20 9 P.T.C.
6. ra)
Discuss the circumstances under
which the following types of pumps may be used 5
Reciprocating pump
Centrifugal pump
Airlift pump
Explain the significance of nitrogen and phosphorus from the point of view of water quality. 5
Explain the relationship between HOCI and OCI-occurring at various pH levels with the help of a suitable sketch. 5
A cofferdam is designed for a 30year flood and constructed. It takes 6 years to complete the main dam construction. What is the risk of the cofferdam failure before the main dam is completed? What return period in the design of cofferdam would have reduced the risk to 120/0? 5
Defme trap efficiency of a reservoir. What are the measures that are to be taken to control the sediment yield into a reservoir? 5
In a recuperation test on an open well, the water level was depressed by 4 m and it was observed to rise by 2·5 m in 90 minutes. What is
B-JGT-K-DJB/20 10
the specific capacity of the well? What would be the yield from the well under a depression of 3 if the diameter of the well is 7·5 5
Draw a neat sketch (plan) of a diversion scheme headworks showing all the components. 5
Following are the data of a canal fall
FSL =10m Bed level 7m •
Bed width 16 m Discharge;:; 45 cumecs Crest length of the fall =10 m (the cross-section being
rectangular) Coefficient of discharge 1· 7 Design fall crest. 5
ti) What is 'river training'? Draw neat
sketches (plans) of attracting spur . and repelling spur. 5
Write short notes on chlorination
f
and desalination. 5
In a continuous flow settling tank 3 m deep and 50 m long, what flow velocity of water would you recommend for effective removal of 0·025 mm particles at 25 ClC? The specific gravity particles is 2· 65 and the kinematic viscosity for water may be taken as
o.01em2 sec. 10
B-JGT-K-DJB/20 11 P.T.G.
7. The cross-section of a trapezoidal gravity dam has a top width of 5 bottom width 20 ill, height 30 fi, out of which 2 m is freeboard. Check the stability of the dam section neglecting uplift forces. 10
Draw neat sketches of different types of keys for shear resistance in 5
A homogeneous earthen darn is 22 m high and has a freeboard of 2 m. A flow net constructed indicates 12 potential drops and 4 channels. Calculate the discharge per metre length of the dam, if the coefficient of permeability of the dam material is 2·75 X 10-3 cm/s. 5 .. ..
What do you understand by a hydraulically equivalent section? Mention the conditions when two conduits are hydraulically equivalent. 5
In the context of emission of gaseous effluents from a chimney, briefly describe various types of plume behaviour with the help of suitable diagram(s). 5
Explain the term 'time of concentration' and its significance in design of storm sewers. 5
.B-JGT-K-DJB/20 12
The 5 days' BOD of a waste is
280 mg/litre. The ultimate BOD is
reported as 400 mg/litre. At what
rate is the waste being oxidised? 5
8. A weir has 50 vertical gates each of
9 . 75 m span, maximum reservoir
level 11· afi, crest level 6· 5
coefficient of end contraction for
piers =O· 021, coefficient of end
• • contraction for abutments 0 ·11, coefficient of discharge for the weir
1· 70. Compute the maximum
flood discharge which can safely
pass over the weir without
exceeding the full reservoir level.
Neglect velocity of approach. 5
The bed slope of an irrigation canal
is to be fIXed at the rate of 1 m in
5 Ian length, the average silt size
carried is 0·35 mm. Design the
cross-section of the channel using
Lacey's ...theory, when the side
slopes are 450 • 5
Ii) Define mass curve of a rainfall
and rainfall hyetograph. With neat
sketches, explain how the
hyetograph is derived from the
mass curve. 5
B-JGT-K-DJB/20 13 p.T.a.
The following flows are recorded in the driest year at a project site. Detennine the minimum capacity of the reservoir to allow the available volume of water to be drawn off at a uniform rate assuming that there is no loss of water over the spillway. Use arithmetic method 5
162, 150, 114, 102, 112; 190, 276, 332, 305, 257, 252) million metre 3 Draw a sketch of a grease trap and describe its working. 5 .. ... •
Compare the working of tank and an Imhoff tank. a septic 5
Explain the significance following heavy metals atmosphere of In the the 5
Cadmium, Lead Nickel, Mercury,
The mean concentration of S02 at •
STP in Delhi is 42 J.lg m 3. What is
the equivalent concentration m
ppm at 25°C and 1 atm? 5
B-JGT-K-DJB/20 14 BS-2200