Surveying
After fixing the plane table to the tripod, the main operations which are needed at each plane table station are (i) Levelling (ii) Orientation (iii) CenteringThe correct sequence of these operations is

(i), (iii), (ii)
(iii), (i), (ii)
(i), (ii), (iii)
(ii), (iii), (i)

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Surveying
A ’level line’ is a

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

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Surveying
Dumpy level is most suitable when

the instrument is to be shifted frequently
All of these
fly levelling is being done over long distance
many readings are to be taken from a single setting of the instrument

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