Chain surveying is well adopted for small areas in open ground small areas with

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small areas in open ground

Surveying problems

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1. For locating a distant object visible from two transit stations, the method usually preferred to, is
Options
A. Angles and distances from transit stations
B. Angles from two transit stations
C. distance from two transit stations
D. Angle from one transit station and distance from the other.

2. A sewer is laid from a manhole A to a manhole B, 250 m away along a gradient of 1 in 125. If the reduced level of the invert at A is 205.75 m and the height of the boning rod is 3 m, the reduced level of the sight rail at B, is
Options
A. 208.75 m
B. 202.75 m
C. 206.75 m
D. 211.75 m

4. Check lines (or proof lines) in Chain Surveying, are essentially required
Options
A. to plot the chain lines
B. to plot the offsets
C. to indicate the accuracy of the survey work
D. to increase the out-turn

5. Pick up the correct statement from the following
Options
A. 1 second of arc corresponds to a displacement ratio of 1:206, 300
B. 1 degree of arc corresponds to a displacement ratio of 1:57
C. the angular errors tend to propagate themselves along a traverse as the square root of the number of stations
D. the errors arising from the linear measures tend to be roughly proportional to the lengths of the lines
E. all the above.

10. Which one of the following statements is correct?
Options
A. when the axes of rotation of the graduated circle and the verniers are not coincident, the instrument possesses eccentricity
B. the mean of the readings of the two verniers gives correct reading free from the eccentricity
C. one vernier may be used if the readings of two verniers differ by a constant
D. all the above.

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