Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
horizontal line
line passing through the center of cross hairs and the center of eye piece
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the three angles of a plane triangle should be 180°
The sum of the angles around a station should be 360°
The sum of the eight angles of a braced quadrilateral should be 360°
All listed here

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

All of these
angular measurements are more accurate than linear measurements
linear measurements are more accurate than angular measurements
linear and angular measurements of the traverse are of equal accuracy

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