Surveying
The station where observations are not made, but the angles at the station are used in triangulation series, is known as

Main station
Subsidiary station
Pivot station
Satellite station

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

All of these
linear and angular measurements of the traverse are of equal accuracy
linear measurements are more accurate than angular measurements
angular measurements are more accurate than linear measurements

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Surveying
The difference between a level line and a horizontal line is that

both are same
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is a curved line while hori-zontal line is a straight line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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