Q. In chain surveying at what circumstances ranging is done ?

A
When the stations are intervisible
B
To set out the foot of a perpendicular from a point outside the survey line
C
When the length of the survey line is more than the chain length
D
When the ranging rods are not available
Solution:

When a survey line is longer than a chain length, it is necessary to align intermediate points on chain line so that the measurements are along the line. The process of locating intermediate points on survey line is known as ranging.

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