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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 -2.835 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
  • a)
    116.720
  • b)
    116.080
  • c)
    114.080
  • d)
    111.050
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A level instrument at a height of 1.320 m has been placed at a station...
RL of Bottom of Bridge Deck = 112.565 + 1.320 + 2.835
RL of Bottom of Bridge Deck = 116.720 m.
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Most Upvoted Answer
A level instrument at a height of 1.320 m has been placed at a station...
Given data:
- Height of the instrument (HI) = 1.320 m
- Reduced Level (RL) of the station = 112.565 m
- Reading on levelling staff (BS) = -2.835 m

To find: RL of the bottom of the bridge deck

Let's calculate the elevation of the bottom of the bridge deck step by step.

1. Calculate the height of the instrument line of sight (HILS):
HILS = HI + BS
HILS = 1.320 m + (-2.835 m)
HILS = -1.515 m

2. Calculate the elevation of the bottom of the bridge deck (RLBD):
RLBD = RL + HILS
RLBD = 112.565 m + (-1.515 m)
RLBD = 111.050 m

Therefore, the RL of the bottom of the bridge deck is 111.050 m.

Explanation:
- The instrument is set up at a height of 1.320 m.
- The reading on the levelling staff held at the bottom of the bridge deck is -2.835 m.
- The reading is negative because it is below the instrument line of sight.
- To calculate the elevation of the bottom of the bridge deck, we need to add the height of the instrument line of sight to the reading on the levelling staff.
- The resulting value is then added to the Reduced Level of the station to find the RL of the bottom of the bridge deck.
- In this case, the RL of the bottom of the bridge deck is calculated to be 111.050 m.
- Therefore, the correct answer is option 'A' which is 116.720 m.
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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 -2.835 m on a levelling staff held at the bottom of a bridge deck. The RL (in m) of the bottom of the bridge deck isa)116.720b)116.080c)114.080d)111.050Correct answer is option 'A'. Can you explain this answer?
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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 -2.835 m on a levelling staff held at the bottom of a bridge deck. The RL (in m) of the bottom of the bridge deck isa)116.720b)116.080c)114.080d)111.050Correct answer is option 'A'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about 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 -2.835 m on a levelling staff held at the bottom of a bridge deck. The RL (in m) of the bottom of the bridge deck isa)116.720b)116.080c)114.080d)111.050Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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 -2.835 m on a levelling staff held at the bottom of a bridge deck. The RL (in m) of the bottom of the bridge deck isa)116.720b)116.080c)114.080d)111.050Correct answer is option 'A'. Can you explain this answer?.
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