cameroon gce A level digital processing and survey technology 2
cameroon gce A level digital processing and survey technology 2\
Part one: KNOWLEDGE AND COMPREHENSION 8 marks
NB: Answer all questions in this part
I. In Engineering surveying, what do the following terms mean?
a) Set out
b) Digital Terrain Model
c) Differential levelling
d) Horizontal curves
e) Control networks (2.5 marks)
II. a) By means of sketches and formulae, describe two ways of determining a horizontal distance on a sloping ground by means of a tape. (2 marks)
b) Explain the difference between closed and open theodolite traverses. (2 marks)
c) Comment also on their spheres of application and the various controls. (1.5 marks)
Part two: NUMERICAL APPLICATIONS 12 marks
NB: Answer two questions in this part
Question one
A 500 meters section of a road in a quarter in Bamenda is to be improved by regarding it to a constant gradient, rising towards point B, while the levels at A and B, remaining unchanged. From the following level book extract giving a longitudinal section of the existing road, you are required to:
1) Determine the natural ground heights at the various points. (1 mark)
2) What is the projected gradient of the new alignment? (1 mark)
3) Calculate the project heights at all the points. (2 marks)
4) Determine the maximum depth of cutting and embankment (2 marks)
Table 1
Back Sight(m) Intermediate Sight(m) Fore Sight(m) Remark;Chainages
3.728 BM I;Height=89.170m
3.542 0m, Point A
3.109 50m
2.606 100m
2.524 150m
3.216 0.997
3.630 200
2.161 250
3.417 0.920
2.374 300
3.356 0.238
2.768 350
0.951 400
2.219 0.582
1.509 450
1.920 500;Point B
0.686 BM II ;Height=101.670m
