Which is the arithmetic check for the height of instrument method?(a) ∑FS + ∑BS = First RL + Last [email protected](b) ∑BS – ∑FS = Last RL – First [email protected](c) ∑FS + ∑BS = Last RL + First [email protected](d) ∑BS – ∑FS = First RL – Last [email protected]I got this question in final exam.This is a very interesting question from Methods of Levelling topic in division Basic Surveying of Basic Civil Engineering

Which is the arithmetic check for the height of instrument method?(a)

1.	Which is the arithmetic check for the height of instrument method?(a) ∑FS + ∑BS = First RL + Last [email protected](b) ∑BS – ∑FS = Last RL – First [email protected](c) ∑FS + ∑BS = Last RL + First [email protected](d) ∑BS – ∑FS = First RL – Last [email protected]I got this question in final exam.This is a very interesting question from Methods of Levelling topic in division Basic Surveying of Basic Civil Engineering
Answer» Right option is (B) ∑BS – ∑FS = Last RL – First [email protected] To explain I WOULD say: To check if the readings are written properly, an arithmetic check is done. The sum of back SIGHT (BS) and Fore sight (FS) are subtracted. It should be EQUAL to the difference of the last and first reduced level (RL).

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