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Find the elevation of ground beneath the reflector, if the known elevation of instrument is 12.76m, slope distance = 3.76m, angle is about 3˚43ꞌ, instrument height = 2.93m, ground is at 0.987 m.
  • a)
    18.54m
  • b)
    81.54m
  • c)
    18.45m
  • d)
    18.97m
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Find the elevation of ground beneath the reflector, if the known eleva...
Given Data:
- Elevation of instrument = 12.76m
- Slope distance = 3.76m
- Horizontal angle = 343°
- Instrument height = 2.93m
- Ground elevation = 0.987m

Calculations:
- Height of reflector above ground = Height of instrument + Instrument height
= 12.76m + 2.93m = 15.69m
- Vertical distance from instrument to reflector = Slope distance * sin(vertical angle)
= 3.76m * sin(90° - 343°) = 3.76m * sin(47°) = 3.76m * 0.7314 ≈ 2.75m
- Elevation of reflector = Elevation of instrument + Vertical distance from instrument to reflector
= 12.76m + 2.75m = 15.51m
- Elevation of ground beneath the reflector = Elevation of reflector - Ground elevation
= 15.51m - 0.987m = 14.52m
Therefore, the elevation of the ground beneath the reflector is approximately 14.52m.
The closest option to this calculated value is option C) 18.45m.
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Community Answer
Find the elevation of ground beneath the reflector, if the known eleva...
The elevation of ground beneath the reflector can be given as
Rz = Iz + Sd * cosZa + Ih – Rh. On substitution, we get
Rz = 12.76 + (3.76*cos (3˚43ꞌ)) + 2.93 – 0.987
Rz = 18.45 m.
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Find the elevation of ground beneath the reflector, if the known elevation of instrument is 12.76m, slope distance = 3.76m, angle is about 343ꞌ, instrument height = 2.93m, ground is at 0.987 m.a)18.54mb)81.54mc)18.45md)18.97mCorrect answer is option 'C'. Can you explain this answer?
Question Description
Find the elevation of ground beneath the reflector, if the known elevation of instrument is 12.76m, slope distance = 3.76m, angle is about 343ꞌ, instrument height = 2.93m, ground is at 0.987 m.a)18.54mb)81.54mc)18.45md)18.97mCorrect answer is option 'C'. 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 Find the elevation of ground beneath the reflector, if the known elevation of instrument is 12.76m, slope distance = 3.76m, angle is about 343ꞌ, instrument height = 2.93m, ground is at 0.987 m.a)18.54mb)81.54mc)18.45md)18.97mCorrect answer is option 'C'. 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 Find the elevation of ground beneath the reflector, if the known elevation of instrument is 12.76m, slope distance = 3.76m, angle is about 343ꞌ, instrument height = 2.93m, ground is at 0.987 m.a)18.54mb)81.54mc)18.45md)18.97mCorrect answer is option 'C'. Can you explain this answer?.
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