Surveying November 2009

PART A

1. (a) Explain briefly the principles of chain surveying.

(b) What is meant by local attraction? How is it rectified?

(c) Briefly explain profile leveling

(d) What are the methods of contouring? Explain briefly.

(e) With the help of neat sketch explain the working of box sextant.

(f) Compare the mid ordinate rule and average ordinate rule for working out areas.

(g) Explain the principle ofanallatic lens.

(h) What are the usual errors in theodolite surveying? Explain.

PART B

2. (a) What is an optical square? Explain with a sketch.

(b) How is graphical adjustment of closing error done in a closed traverse?

OR

3.  Given below are the bearings in a closed traverse survey conducted with prismatic compass at a place where local attraction is suspected.

At what stations do you suspect local attraction? Find the correct bearings of the lines.

 Line Fore Bearing Back Bearing AB 191° 45’ 13° 00’ BC 39° 30’ 222° 30’ CD 22° 15’ 220° 30’ DE 242° 45’ 62°45’ EA 330°15’ 147° 45’

4.  The following consecutive readings were taken with a level and a 4m leveling staff on a continuously sloping ground at a common interval of 30m.

0.585 on A, 0.936, 1.953,2.846,3.644,3.938,0.962,1.035, 1.035,1.689,2.534, 3.844,0.956, 1.579 and 3.016 on B.

The elevation of A was 520.450. Determine the gradient of line AB after making up a level field book.

5. (a) Determine the gradient of line AB after OR

(b) Briefly explain the permanent adjustments of a dumpy level.

How is interpolation of contours done.

6. The area within the contour lines at the site of a reservoir and the face of the proposed dam are as follows :

 Contour in m Area in m2 Contour inm Area inm2 450 270 460 4,14,500 452 10,440 462 4,60,800 454 75,600 464 5,86,800 456 1,44,000 466 6,39,900 458 2,70,000

Taking 450 as the bottom level of the reservoir and 466 as the water level, find the volume of water in the reservoir.

OR

7. (a)Derive an expression for prismoidal formula for volume.

(b) Explain the working of Ceylon Ghat Tracer.

8. (a) Briefly explain the various permanent adjustments of a transit theodolite.

OR

9. (a) What are the advantages of tachometric survey?

(b) What is a direct reading tachometer? Explain briefly.