Surveying
Dumpy level is most suitable when

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

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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