Civil Engineering MCQAE Level Civil Engineering
Reciprocal levelling is especially used to eliminate:
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Choose the correct answer
A
chain sag only
B
magnetic declination
C
curvature, refraction and collimation errors across obstacles
D
plane-table orientation error only
Correct Answer
C. curvature, refraction and collimation errors across obstacles
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By observing from both ends across an obstacle, reciprocal levelling cancels curvature, refraction and line-of-collimation errors.
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