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) Centering
The correct sequence of these operations is

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

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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