9. The check on departure dosure after adjustment is equal to lwice he oiginal d

Question

9. The check on departure dosure after adjustment is equal to lwice he oiginal depatture cdosure and of the same sign (a) The sign of the departure closure was not changed in the adjustment process (b) This proves zenith angles were not measured in direct and reverse (c) The angle adjustment process was incorrectly computed (d) This proves a poor linear eror of closure existed and the traverse shouk he re-run. 10. A typical topographic chain that most often requires simultaneous chain collection of the same feature code is (a) rebar (b) sidewalk (c) feoce (d) manbole 11. Point symbol sizes need scaling because (a) it relates to the radius of point features like power poles (b) each survey has a unique linear error of closure/precision (c) each size of survey is unique which affects visualization of point features (d) the point description will define the size of the point symbol 12. What is correct about resection? (a) Only horizontal position can be calculated (b) it requires repetition in direct and reverse positions (c) it requires a minimum of three visible known stations (d) it eliminates the need to sight the resected (occupied) station from a previous.coordinated traverse station

Explanation / Answer

Prob. (9)

Ans: (a)

Whatever the closure is, is the error in the departure, and the correction is of equal magnitude, but opposite in direction. That means the sign of the error must be changed before applying the correction, if not, then instead of removing the closure, it will double the closure from its previous value with same sign.

Prob. (11)

(d) It eliminates the need to sight the resected station from a previous co-ordinated traverse station.

Resection problems are classified in two categories : Three point problem and Two point problem. There is no need to sight the resected station from the previously coordinated traverse station.

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