Which statement is true for chain surveying?

Question

Question

This question was previously asked in

JKSSB JE Civil Jal Shakti 5 Dec 2022 Official Paper (Shift 1)

They are formed of straight links of Galvanized mild steel wires.
To facilitate easy reading of the chain, brass tallies are provided.
It is to be noted that length of a link is the distance between centres of two consecutive middle rings.
All of these

Answer 1

Explanation:

Chain in Surveying :

Each link is made into a circular loop by bending it and then connecting the links with rings to make the whole chain so that the chain is flexible.

When the metric system was implemented in India, a 100-foot engineering chain, a 66-foot gutter chain, and a 33-foot revenue chain were used.
Now metric chains of 5, 10, 20, and 30-meter lengths are used.
The survey uses more of the 20 and 30-meter chains.
The chains are 4 mm wide.
They are made of a small link of galvanized wire of diameter.
Usually, three rings are placed between the two links. The two rings are elliptical and the middle ring is round.
A handle is pulled to both ends of the chain, and the handle is attached to the chain with a sliding joint so that it can rotate around the ends of the chain.
The chain length is inscribed on the handle of the chain.
that length of a link is the distance between the centers of two consecutive middle rings.
The length of the link of each metric chain is 20 cm.
To have that is the 5-meter chain is made up of 25, 10-meter chain 50, 20-meter chain 100, and 30-meter chain 150 links.
IS 1492-1970 details metric chains.
In each 5-meter chain, a meter of brass tile is attached at the end of each meter. It has 1 tooth and a 4-meter tally to one tooth, while 2 meters and 3-meter tally have two teeth.