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

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

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Surveying
Refraction correction

adds to the curvature correction
completely eliminates curvature correction
partially eliminates curvature correction
has no effect on curvature correction

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