Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 4 (Q.No. 20)
20.
In trigonometric levelling, if the horizontal distance between the instrument and the object is 3088 m, the coefficient of refraction is 0.07 and R sin 1" = 30.88 m, then the refraction correction in angular measure would be
Discussion:
3 comments Page 1 of 1.
John said:
8 years ago
Please explain this.
(1)
Vai said:
8 years ago
Central angle, a = D/R sin 1" = 3088/30.88 = 100".
Assuming coefficient of refraction, m = 0.07.
Refraction correction = m*a = 0.07*100 = 7" (-).
Curvature correction = a/2 = 100/2 = 50" (+).
Assuming coefficient of refraction, m = 0.07.
Refraction correction = m*a = 0.07*100 = 7" (-).
Curvature correction = a/2 = 100/2 = 50" (+).
(3)
Jitendra said:
5 years ago
Cr=mD/R*sin1"=7.0".
m = coefficient of refraction.
m = coefficient of refraction.
(2)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers