Surveying
The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

as far as possible from the line AB
closer to the lower station
equidistant from A and B
closer to the higher station

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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
In triangulation surveys

Sides are not measured excepting the base line
The area is divided into triangular figures
All listed here
Control stations are located from which detailed surveys are carried out

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