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Surveying - Engineering

Q1:

Prolongation of chain line across an obstruction in chain surveying, is done by

A making angular measurements

B drawing perpendiculars with a chain

C solution of triangles

D all the above.

ANS:B - drawing perpendiculars with a chain

In chain survey,
Linear measurement is only done.
Angular measurement is not done. So the correct answer is B. In chain survey, only chain and tape are used for surveying.
Hence, the only perpendicular line can be drawn with the help of chain or tape only. Both option B and C are right because in the chain survey we can have a solution of 3-4-5. Chain measures angles otherwise solutions for triangle can't be made. Chain can be used for 45 degree and 90 degree.