GATE CE 2018 Set 2 — Question 46
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Geomatics Engineering → Levelling → Height of Instrument Method
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Question
A level instrument at a height of 1.320 m has been placed at a station having a Reduced Level (RL) of 112.565 m. The instrument reads m on a levelling staff held at the bottom of a bridge deck. The RL (in m) of the bottom of the bridge deck is
Correct answer
(A) 116.720
Solution
1.Calculate the Height of Instrument (HI):
2.Calculate the RL of the bottom of the bridge deck:
Since the staff is held at the bottom of the deck (inverted staff), the reading is given as negative.Thus, the correct option is (A).Continue learning with Success Tracker
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