Question Paper: Surveying 1 Question Paper - Jun 18 - Civil Engineering (Semester 3) - Mumbai University (MU)
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## Surveying 1 - Jun 18

### Civil Engineering (Semester 3)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question No. 1 is compulsory.
(2) Attempt any three questions from the remaining questions.
(3) Draw neat diagrams wherever necessary

• a) Define Surveying. Classify surveying on the basis of the instrument used.

760

• b) Differentiate between Whole circle bearing (WCB) and Reduced bearing system. If $\theta$ is the WCB, what would be the reduced bearing in all four quadrants?

774

• c) Define: i) Chainage ii) Backsigth iii) Intermediate sight iv) Foresight v) Change point.
• d) A tacheometer has a diaphragm with three cross hairs spaced at a distance of 1.40 mm. The focal length of the object glass is 20 cm and the distance of the object glass from the trunnio axis is 10 cm. Calculate the tacheometric constants.

(20 marks) 00

2(a) A closed compass traverse ABCD was conducted round a lake and the bearings as shown aside were obtained. Determine which of the stations are affected by local attraction and give the values of the corrected bearings.

Line AB BC CD DA
F.B 84$^o$20' 117$^o$20' 234$^o$50' 316$^o$40'
B.B 266$^o$0' 296$^o$20' 54$^o$50' 136$^o$0'

(10 marks) 782

2(b) A road embankment 35 m wide at top with side slope of 2 to 1 have ground levels at 100 metres interval along line AB as under: A(153.0), 151.8, 151.2, 150.6, (149.2)B. The formation level at A is 162.4 with a uniformly falling gradient of 1 in 40 from A to B. Find volume of earthwork by prismoidal formula. Assume the ground to be level in c/s.

(10 marks) 00

3(a) Following is the page of a level book. Fill in the missing data. Apply the usual checks. $\sum$ B.S is 8.445.

Station B.S I.S F.S Rise Fall RL Remarks
1 2.150 450.000 BM
2 1.645 ? 0.500 ?
3 2.345 ? ?
4 ? 1.965 ? ?
5 2.050 1.825 0.400 ?
6 ? ? 451.730
7 (-)1.690 ? 0.120 ? Inverted staff rdg
8 ? 2.100 ? ?
9 ? ? 499.100

(12 marks) 566

3(b) Write a note on different axes of a theodolite and their inter relationships for the instrument to be in perfect adjustment along with a neat sketch.
(8 marks) 1769

4(a) List the accessories required for Plane Table Survey, Describe the radiation method of plane table survey with its advantage.
(10 marks) 750 752

4(b) Write short notes on:

• i) Measurement of horizontal angle by method of Repetition.

1771

• ii) Two point problem.
(10 marks) 783

5(a) Calculate latitudes and departures for the traverse whose details are as shown aside:

Line Length (m) WCB
AB 89.31 45$^o$10'
BC 219.76 72$^o$05'
CD 151.18 161$^o$52'
DE 159.10 228$^o$43'
EA 232.26 300$^o$42'

(12 marks) 00

5(b)

Distance 0 (pt. P) 20 40 60 80 100 120 140 160 (pt.Q)
Offset 2.40 3.70 4.65 6.85 5.35 7.20 8.85 8.35 5.60

The above perpendicular offsets were taken at 20 m intervals from a survey line PQ to an irregular boundary line. Calculate the area using Simpson's Rule.

(8 marks) 759

6(a) Initially, a staff was held vertically at a distance of 46.2 m and 117.6 m from the centre of a theodolite fitted with stadia hairs and the staff intercepts with the telescope horizontal were 0.45 m and 1.15 m respectively. The instrument was then set over a station P having RL as 150 m, the height of instrument axis being 1.38 m . The stadia hair readings on a staff held vertically at a station Q with instrument at P were 1.200, 1.930 and 2.650 m respectively, while the vertical angle (depression) was - 9$^o$30'. Find RL of Q & dist. PQ.

(10 marks) 00

6(b) A 20 m chain was found to be 6 cm too long after chaining 1500 m . It was 9 cm too long at the end of day's work after chaining a total distance of 2500 m. If the chain was correct before commencement of the work, find the distance.
(5 marks) 771

6(c) Write a note on Gale's traverse table.
(5 marks) 1843