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Surveying - Engineering

Q1:

The back staff reading on a B.M. of R.L. 500.000 m is 2.685 m. If foresight reading on a point is 1.345 m, the reduced level of the point, is

A 502.685 m

B 501.345 m

C 501.340 m

D 504.030 m

E 502.585 m.

ANS:C - 501.340 m

HI = ZA+BS.
HI =500+2.685 = 502.685.
ZB = HI-FS.
ZB = 502.685-1.345 = 501.34. Reduced level = H.I + F.S.
Reduced level = H.I - B.S.

By using the above formulae we can solve it easily. Rl 500.0 + Bs 2.685 = 502.685.
Hi 502.685- fs 1.345 = 501.340.