Civil Engineering MCQJE Level Civil Engineering
In the Height of Instrument (HI) method of levelling, the HI is calculated as:
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Choose the correct answer
A
HI = RL − BS
B
HI = RL of BM + Back Sight reading
C
HI = FS − BS
D
HI = average of all rod readings
Correct Answer
B. HI = RL of BM + Back Sight reading
Why is this the answer?
HI = RL of benchmark + BS (back sight reading). Then: RL of intermediate/fore sight = HI − IS or HI − FS. HI is convenient when many intermediate sights are taken from one instrument position. Rise and Fall method: Rise = previous reading − present reading if positive (used for arithmetic check).
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