**JNTUPAPERS**

**JNTU II B.Tech I Semester Supplimentary Examinations, November 2008**

** Surveying**

**(Civil Engineering)**

**SET-2**

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1. (a) Define Surveying. Explain its importance for civil Engineers.

(b) What is meant by Reconnaissance Survey.

(c) A Chain was tested before starting a survey and was found to be exactly 30m.

At the end of the Survey, it was tested again and found to measure 30.10m.

The area of the plan of the field drawn to a sale of 1cm = 20m was 160 square

centimeters. Find the true area of the field in square metres.

2. (a) Explain compensating and cumulative errors in chain Surveying.

(b) What are the Survey stations. How will you select them.

(c) A Survey line CD intersects a high building. To prolong the line beyond this obstacle, a perpendicular DE, 200m long is set out at D. From E, two lines EF and EG are set out at angles of 450 and 600 with ED respectively. Determine the length of EF and EG in order that the points F and G may lie on the prolongation of CD, and also find the obstructed length DF.

3. A dumpy level was set up at C exactly mid way between two pegs A and B 100m apart. The readings on the staff when held on the pegs A and B were 2.250 and 2.025 respectively. The instrument was then moved and set up at a point D on the line BA produced, and 20m from A. The respective staff readings on A and B were 1.875 and 1.670. Calculate the staff readings on A and B to give a horizontal line of sight.

4. A rectangular plot ABCD forms the plan of a pit excavated for road work. E is

point of intersection of diagonals. Calculate the volume of excavation from the

following data if length AB = 50m and BC = 80m:

Point A B C D E

Original level 45.2 49.8 51.2 47.2 52.0

Final level 38.6 39.8 42.6 40.8 42.5

5. (a) What do you understand by ‘Temporary Adjustment’? Describe in brief the

various temporary adjustments of a Theodolite.

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

6. (a) How would you locate details in a tacheometric traverse?

(b) Explain the use of a tacheometer in contour surveying

7. (a) What are the usual difficulties in ranging simple curves and how are they obviated.

(b) Calculate the ordinates from a 150m long chord at 10m interval to set out a

simple circular curve of 80

8. Explain about the segments of Global Positioning system?