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Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 20 (Q.No. 23)
UPSC Civil Service Exam Questions
23.
In setting out a long straight line for the position of transmission towers, it is recommended that the forward point be set out with face-right and face-lett with reference to preceding point and the mean position taken. This field procedure eliminates instruments error where the
trunnion axis is not perpendicular to vertical axis
vertical axis is not perfectly vertical time of observation
line of collimation is not perpendicular to the vertical axis
line of collimation is not perpendicular to the horizontal axis
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
1 comments Page 1 of 1.
Jawad said:   3 years ago
Please explain the answer.
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