Biju Patnaik University of Technology 2008-4th Sem B.Tech (B Tech) , surveying-I . - Question Paper
BPUT(B Tech) , fourth semester surveying-I ques. paper.
(e) Find the magnetic declination at a place if the magnetic bearing of the sun at noon is 184.
(f) What are face left and face right observations ? Why is it necessary to take both face observations ?
(g) Distinguish between : close traverse and open traverse.
(h) What is parallax ? How can you eliminate it ?
(i) List the various uses of contour maps.
(j) List the various instruments and accessories needed to do plane table surveying.
2. (a) A 20 m chain used for a survey was found to be 20.10m at the beginning and 20.30 m at the end of the work. The area of the plan drawn to a scale of 1 cm = 8 m PCCI 8201 3 P.T.O.
was measured with the help of a planimeter and was found to be 32.56 sq. cm. Find the true area of the field. 5
(b) What are the different tape corrections and how are they applied ? 5
3. (a) To continue a survey line AB past an obstacle, a line BC 200 metres long was set out perpendicular to AB, and from C angles BCD and BCE were set out at 60 and 45 respectively. Determine the lengths which must be chained off along CD and CE in order that ED may be in AB produced. Also, determine the obstructed length BE. 5
(b) What are the instruments used in chain surveying ? How is a chain survey executed in the field ? 5
4. (a) The following bearings were observed with a prismatic compass. Calculate the interior angles. 4
|
Line |
Fore bearings |
|
AB |
60 30 |
|
BC |
122 00 |
|
CD |
46 00 |
|
DE |
205 30 |
|
EA |
300 00 |
(b) The following bearings were observed while traversing with a prismatic compass. 6
|
Line |
Fore |
Back |
|
Bearing |
Bearing | |
|
AB |
45 45 |
226 10 |
|
BC |
96 55 |
277 05 |
|
CD |
29 45 |
20910 |
|
DE |
324 48 |
144 48 |
Mention which stations were affected
by local attraction and determine the corrected bearings.
5. (a) What are the different types of errors
encountered in theodolite work ? How are they eliminated ? 4
(b) What do you mean by balancing a traverse ? Explain clearly with the help of illustrations, how a traverse is balanced ?
6
6. (a) The following staff readings were observed
successively with a dumpy level, the instrument have been moved after third, sixth and eighth readings :
2.228 ; 1.606 ; 0.988 ; 2.090 ; 2.864; 1.262 ; 0.602 ; 1.982 ; 1.044 and 2.684 metres.
Enter the above readings in a page of a level field book and calculate the R.L. of points if the first reading was taken with a staff held on a bench mark of 432.384 m.
6
(b) During a construction work, the bottom of a R.C. Chhajja A was taken as a temporary Bench Mark (R.L. 63.120 m). The following notes were recorded.
Reading on inverted staff on B.M. A : 2.232 m Reading on peg P on the ground : 1.034 m Change of instrument Reading on peg P on the ground : 1.328 m Reading on inverted staff on bottom of cornice B : 4.124 m
Enter the above readings in a page of a level field book and calculate the R.L. of the cornice B. 4
7. (a) Discuss the various methods of interpolating the contours. 5
(b) Discuss the advantages and disadvantages of plane table surveying over the other methods of surveying. 5
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