code no: r050210103 set no. 1 ii b.tech i semester ... b.tech i semester supplementary examinations,...

Code No: R050210103 Set No. 1

II B.Tech I Semester Supplementary Examinations, February 2007SURVEYING

(Civil Engineering)Time: 3 hours Max Marks: 80

Answer any FIVE QuestionsAll Questions carry equal marks

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1. (a) Describe plane Table intersection method with the help of neat sketches. Un-der what circumstances this method is resorted to.

(b) Explain the various sources of errors in plane Table Surveying. [8+8]

2. (a) Explain the terms : Check Line, Base Line, Tie Line, and oblique offset. [8]

(b) Find the maximum length of offset so that the displacement on paper fromboth sources of error does not exceed 0.2 mm given that the offset is measuredwith an accuracy of 1 in 25 and the scale is 1cm = 50m. [8]

3. Explain the following principal methods of levelling:

(a) Barometric levelling

(b) Trigonometric levelling

(c) Spirit levelling [16]

4. The areas enclosed by various contours on the upstream side of a dam are givenbelow. Determination.

(a) the capacity of the reservoir if the full reservoir level (FRL) is 125m. [8]

(b) the elevation of the water surface when the reservoir is half-full. Ignore thevolume below R.L. 100m. [8]

Contour(m) 100 105 110 115 120 125Area(ha) 3 8 10 15 20 25

5. (a) What do you understand by ‘Temporary Adjustment’? Describe in brief thevarious temporary adjustments of a Theodolite. [8]

(b) Discuss the procedure of measuring a horizontal angle with a theodolite [8]

6. Differentiate between the fixed hair method and the movable hair method. Discussthe advantages and disadvantages of each method [16]

7. (a) What is a compound curve. If in a compound curve, the direction of the twostraights and one radius are known, deduce the formula for other radius. [7]

(b) Tabulate the necessary data to set out a right handed simple circular curve of600m radius to connect two straights intersecting at a chainage of 3605m byRankines method of deflection angles. The angle of deflection of the curve is250 and the peg interval is 30m. [9]

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8. (a) What is Geodetic Surveying? How it is different from Plane surveying [8]

(b) Explain the importance of electronic surveying in the field of surveying [8]

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1. (a) What is local attraction. How is it detected and removed.

(b) What do you understand by closing error of a compass traverse. Show howcan it be adjusted by graphical method. [8+8]

2. (a) What are the essential differences between chain Survey and compass Sur-vey. Under what circumstances compass Survey is preferred to other types ofSurveys.

(b) Find which station is free from local attraction and work out the correctbearings.

Line F.B B.BAB 191o45′ 13o00′00

′′

BC 39o30′ 222000′30′′

CD 22o15′ 200030′00′′

DE 242o45′ 60045′00′′

EA 330o15′ 147045′00′′

[8+8]

3. The following observations were made during the testing of a dumpy level:

Instrument at Staff reading onA B

A 1.702 2.244B 2.146 3.044

Distance AB=150m Is the instrument in adjustment? To what reading shouldthe line of collimation be adjusted when the instrument was at B? If the R.L ofA=432.052, what should be the R.L. of B.

[16]

4. What are the methods of measuring volume ? Explain the measurement of volumefrom spot level. [16]

5. The table below gives the lengths and bearings of the lines of a traverse ABCDEA,the length and bearing of EA having been omitted. Calculate the length andbearing of the line EA. [16]

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Line Length (m) BearingAB 204.0 87030′

BC 226.0 20020′

CD 187.0 28000′

DE 192.0 210030′

EA ? ?

6. (a) What is tangential system of tacheometry? What are its advantages anddisadvantages over the stadia method? [8]

(b) Determine the constants of a tacheometer if for the line of collimation hori-zontal, the staid readings for he staff held at 25 m and 50 m are respectively1.900, 1.410 and 2.22, 1.23 [8]

7. (a) Draw a neat sketch of a simple circular curve and represent different elementsof it. [4]

(b) Establish the relation δ = 1718.9C

Rminutes [4]

where δ = deflection angle of the chord; C = length of chord. R= Radius ofthe curve,

(c) Calculate the perpendicular offsets at 20m intervals along the tangents to setout first five pegs of a simple circular curve of 250m radius. [8]



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1. (a) Describe plane Table intersection method with the help of neat sketches. Un-der what circumstances this method is resorted to.

(b) Explain the various sources of errors in plane Table Surveying. [8+8]

2. (a) Explain the terms : Check Line, Base Line, Tie Line, and oblique offset. [8]

(b) Find the maximum length of offset so that the displacement on paper fromboth sources of error does not exceed 0.2 mm given that the offset is measuredwith an accuracy of 1 in 25 and the scale is 1cm = 50m. [8]

3. (a) What are“temporary adjustments”?

(b) Name the temporary adjustments of a level? Briefly explain them. [6+10]

4. What are the methods of measuring volume ? Explain the measurement of volumefrom spot level. [16]

5. The following lengths and bearings were recorded in running a Theodolite traverse.Determine the omitted observations, the length & bearing of SP. [16]

Line Length (m) WCBPQ 255 140 042′

QR 656 350 00′

RS 120 3380 42′

SP – –

6. (a) Derive an expression for the horizontal distance of a vertical staff from atacheometer, if the line of sight is horizontal. [8]

(b) The following readings were taken with a vernier theodolite on to a verticalstaff

Horizontal distance Stadia readings46.20 m 0.780, 1.010, 1.24061.20 m 1.860, 2.165, 2.470

Calculate the Tacheometric constants [8]

7. (a) Describe the method of setting out a simple circular curve using two Theodolites.-[8]

(b) Two roads meet at angle of 127030′. Calculate the necessary data for settingout a curve of 450m radius to connect two straight portions of the road if aTheodolite is available. [8]

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1. (a) Give a detailed classification of Surveys.

(b) A line 3.2 km long is measured with a steel tape which is 20m under no pullat 30oC. The tape in section is 1/8 cm wide and 1/20 cm thick. If one half ofthe line is measured at a temparature of 40oc and the other half at 50oC andthe tape is attached to a pull of 200N, find the corrected total length of theline given the coefficient of expansion is 11.5 × 10−6 per degree C, weight oftape per Cubic cm of steel = 0.77504N, and E = 2.1× 105N/mm2. [7+9]

2. (a) Explain the different methods of plotting a compass traverse.

(b) The following are the bearings of a closed traverse. Find out which of thestations are affected by local attraction. Tabulate the corrected bearings oflines.

Line F.B B.BAB N50030′W S47030′EBC N54000′E S53000′WCD S3030′E N4000′WDE S41030′E N41030′WEA S79030′W N78000′E

[8+8]

3. With the help of neat sketches explain the following terms:

(a) Mean sea level

(b) Bench mark

(c) Line of collimation

(d) Bubble line [4×4=16]

4. A railway embankment 400m long is 12m wide at the formation level and has theside slope 2 to 1. The ground levels at every 100m along the centre line one:

Distance: 0 100 200 300 400R. L. 204.8 206.2 207.5 207.2 208.3

The formation level at Zero chainage is 207 and the embankment has a risinggradient of 1 in 100. The ground is level across the centre line. Calculate thevolume of earthwork. [16]

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5. The table below gives the lengths and bearings of the lines of a traverse ABCDEA,the length and bearing of EA having been omitted. Calculate the length andbearing of the line EA. [16]

Line Length (m) BearingAB 204.0 87030′

BC 226.0 20020′

CD 187.0 28000′

DE 192.0 210030′

EA ? ?

6. Determine the gradient from a point A to a point B from the following observationsmade with a tacheometer fitted with an anallactic lens. The constants of theinstruments was 100 and the staff was held vertically: [16]

Inst.Station Staff point Bearing Verticalangle Staff readingP A 1340 +10032′ 13.60, 1.915, 2.470

B 2240 +506′ 1.065, 1.885, 2.705

7. (a) List out different methods of setting out simple curves. Explain Rankine’smethod of deflection angles for setting out a simple curve. [8]

(b) Calculate the offsets at 15m intervals along the tangents to set out a simplecircular curve of 300m radius. [8]

8. (a) What are the components of a GIS and give a brief account of them [8]

(b) Give an account of sources of GIS Data [4]

(c) What are the Spatial data models accounted in GIS and describe of eachmodel [4]

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code no: r050210103 set no. 1 ii b.tech i semester ... b.tech i semester supplementary examinations,...

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