Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 24 (Q.No. 32)
32.
How high should a helicopter pilot rise at a point. A just to see the horizon at point B, if the distance AB is 40 km ?
101.75 m
110.50 m
107.75 m
105.50 m
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
6 comments Page 1 of 1.

Diwkar said:   3 years ago
Curvature correction = d^2/2r,
Refraction correction = d^2/14r,
Combined correction = cc+rc,
= -d^2/2r+d^2/14r.
= 0.0673d^2.

Rachayya said:   7 years ago
0.0673D^2 is the combined correction for curvature and refraction in the survey.

Ushakiran said:   7 years ago
I don't know how you get .0673D^2?

Please explain.

Prasad said:   8 years ago
0.0673 x D^2.
0.0673 x 40^2.
107.68.

Bharath said:   8 years ago
The formula goes like this,

0.0673D^2.
And D = 40km,
Hence 0.0673 * 40^2 = 107.68.

Tarun said:   9 years ago
How? Please solve.

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