Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 2 (Q.No. 16)
16.
The distance between two bench marks is 1000 m. If during levelling, the total error due to collimation, curvature and refraction is found to be + 0.120 m, then the magnitude of the collimation error is
Discussion:
9 comments Page 1 of 1.
Anijith K S said:
2 years ago
C combined = 0.0673 * d² ( C combined = C refraction + C curvature)
C combined = 0.0673 * 1² = 0.0673.
C total = 0.12.
Then, C collimation = 0.12 - 0.0673 = 0.0527.
C combined = 0.0673 * 1² = 0.0673.
C total = 0.12.
Then, C collimation = 0.12 - 0.0673 = 0.0527.
(4)
Amit Singh said:
5 years ago
Curvature correction(m) = -0.06749d^2 (d is in Km),
Refraction correction (m) = 0.01121d^2 (d is in Km),
Combined Correction (m) = -0.06728d^2 (d is in km).
Refraction correction (m) = 0.01121d^2 (d is in Km),
Combined Correction (m) = -0.06728d^2 (d is in km).
(4)
Akash said:
6 years ago
Collimation Error = 0.12-0.0673 = 0.0527.
(3)
Mahendra shukla said:
7 years ago
Given;
Total error =collimation error + curvature error + refraction error.
.120=colli.error-.07857*1+.01122*1,
Colli.error = .120-.06735=.0527.
Total error =collimation error + curvature error + refraction error.
.120=colli.error-.07857*1+.01122*1,
Colli.error = .120-.06735=.0527.
(1)
Uttarayan said:
8 years ago
@Anil.
The value of error due to curvature and refraction comes in m although d is taken in km.
The value of error due to curvature and refraction comes in m although d is taken in km.
(1)
Taofeek said:
8 years ago
@Anil.
The combined error due to curvature and refraction (ecomb) is thus given by ecomb = 0.0675 D2 m where D is the distance in km.
The combined error due to curvature and refraction (ecomb) is thus given by ecomb = 0.0675 D2 m where D is the distance in km.
Anil said:
8 years ago
@Aryan.
How can you subtract? One is in km and other is in mt.
How can you subtract? One is in km and other is in mt.
Kanu said:
8 years ago
Thanks @Aryan.
ARYAN said:
1 decade ago
Error due to curvature and refraction = 0.0678*(d)^2.
Here, d=1 km.
Error= 0.0678.
Collimation error= 0.120 - 0.0678.
Here, d=1 km.
Error= 0.0678.
Collimation error= 0.120 - 0.0678.
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