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GATE 2018 CE (CE2) – Question 46

Geomatics Engineering · Distance and angle measurement, levelling, traversing, triangulation, total station · 2 marks · Multiple choice

A level instrument is 1.320 m above a station of reduced level 112.565 m. It reads −2.835 m on a staff held at the bottom of a bridge deck. The reduced level of that deck bottom is ______.

  1. 116.720 m
  2. 116.080 m
  3. 114.080 m
  4. 111.050 m

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Correct answer: (A) 116.720 m

Explanation

Line-of-sight elevation is $112.565+1.320=113.885$ m. Subtract the signed inverted-staff reading: $\mathrm{RL}=113.885-(-2.835)=116.720$ m (A).