Surveying - Engineering
Q1: The difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal toA
the distance between the zero of gradient and the foot of the staff
B
twice the distance between the zero of graduation and the foot of the staff
C
thrice the distance between the zero of graduation and the foot of the staff
D
none of the above.
ANS:B - twice the distance between the zero of graduation and the foot of the staff The minor distance between the bottom graduation and staff bottom (graduation is usually like E shapes on staff, each arm of E equal to 1cm on staff) , For each station we need to take 2 reading at least FS & BS, and for each station we need to deduction the error (because its cumulative error). However, it's very small error and it remains always under tolerance. |
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