CE 239 — SURVEYING

PART A — (10 ? 2 = 20 marks)
1. Define Tacheometric survey?
2. What do you mean by Anallactic lense?
3. Write short note on classification of triangulation system.
4. Write briefly about Trigonometrical leveling?
5. Distinguish between true value and most probable value of a quantity.
6. Write short note on figure adjustment in Triangulation.
7. What are the properties of spherical triangle?
8. Name the different instrumental corrections to be applied when observing the altitude of a celestial body.
9. Explain the use of sextants.
10. Write short note on legal values of cadastral.
PART B — (5 ? 16 = 80 marks)
11. (i) How do you calculate the horizontal and vertical distances between a instrument station and a staff station when the line of collimation is inclined to the horizontal and the staff is held vertically? (6)
(ii) The following notes refer to a line leveled tacheometrically with an anallactic tacheometer, the multiplying constant being 100 : (10)

Inst. Station Height
of axis Staff Station Vertical Angle Hair
Readings Remarks
P 1.50 B.M. 12'
0.963, 1.515, 2.067 R.L. of B.M.
= 460.650
Staff being held vertically.
P 1.50 Q 5'
0.819, 1.341, 1.863
Q 1.60 R 27'
1.860, 2.445, 3.030
Compute the reduced levels of P, Q and R.
12. (a) (i) Derive the formula used for reducing the angles measured at satellite stations which is located at west of true station. (8)
(ii) From an eccentric station E, 24.24 m from C, the following angles were measured to three triangulation stations A, B and C, the stations B and E being on opposite sides of AC :
32'40'' 24'30''
The approximate lengths of AC and BC were 4705.5 m and
5695.8 m respectively. Find the angle ACB. (8)
Or
(b) (i) How do you calculate the curvature and refraction corrections in Trigonometrical leveling? (8)
(ii) Two stations A and B are 3791.712 m apart. The following observations were recorded : (8)
Height of instrument at A = 1.463 m
Height of signal at A = 5.09 m
Height of instrument at B = 1.494 m
Height of signal at B = 4.511 m
Vertical angle from A to B = 54'30''

Vertical angle from B to A = 50'25''

Reduced level of A = 1275.60 m
Find the reduced level of B.
13. (a) (i) Explain the different methods of estimating the most probable values of quantity. (8)
(ii) Find the most probable values of the angles A, B, and C from the following observations at a station P. (8)
22'25''.6 weight 1 6'45''.4 weight 1
20'7''.7 weight 1 44'29''.1 weight 2
42'32''.5 weight 2
Or
(b) (i) Write the various rules that are adopted for corrections to the observed angle of triangle in Figure adjustment. (8)
(ii) In running a closed line of levels, the following results were obtained :

B.M. Difference of level in m. Distance in Km. Remarks
A to B +5.372 9 Elevation of
A = 825.654
B to C –6.465 12
C to D +7.216 18
D to E +4.138 15
E to A –1.727 6
Calculate the most probable elevations of the bench marks. (8)
14. (a) (i) Write short note on :
(1) Celestial sphere and
(2) Circumpolar stars with neat sketches. (6)
(ii) Calculate the sun’s azimuth and hour angle at sunset at a place in latitude N. When its declination is (1) N and (2) S. (10)
Or
(b) (i) What are the different observational corrections to be applied to the observed altitude of celestial body? (6)
(ii) An observation was made on a star lying west of the meridian at a place in latitude 20'36'' N to determine the azimuth of the survey line AB. The mean observed altitude was 10'24'' and the clockwise horizontal angle from AB to the star was 18'48''. The declination of the star was 54'35'' N. Find the azimuth of the survey line AB. (10)
15. (a) (i) What is meant by EDM? Explain the use and principle of EDM. (6)
(ii) How will you locate the position of boat in the hydrographic survey? Explain the procedure. (10)
Or
(b) (i) Explain the use of photogrammetry in large scale mapping. (8)
(ii) Define cartography and explain the concept of map making. (8)