Discussion :: UPSC Civil Service Exam Questions
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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
A.
trunnion axis is not perpendicular to vertical axis
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B.
vertical axis is not perfectly vertical time of observation
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C.
line of collimation is not perpendicular to the vertical axis
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D.
line of collimation is not perpendicular to the horizontal axis
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