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Generally, In surveying which type of length metric chain are used.
m & 10 m
10 m & 20 m
20 m & 30 m
30 m & 10 m
20 m & 30 m
In surveying practice, the metric chain is standardized by the Bureau of Indian Standards (BIS) to specific lengths to ensure uniformity in linear measurement ┬╖ The most commonly used lengths for surveying chains in the field are 20 meters and 30 meters.
In surveying practice, the metric chain is standardized by the Bureau of Indian Standards (BIS) to specific lengths to ensure uniformity in linear measurement ┬╖ The most commonly used lengths for surveying chains in the field are 20 meters and 30 meters.
L=n├ЧllinkтАЛ тАФ where L is total length, n is number of links, and llinkтАЛ=0.2┬аm
The metric chain operates based on a link-and-handle system where the total length is divided into sub-units ┬╖ For a 20 m chain, there are 100 links (each 0.2 m), and for a 30 m chain, there are 150 links (each 0.2 m) ┬╖ Brass tallies are provided at specific intervals to facilitate rapid measurement by the surveyor without needing to count every single link.
Metric chains are manufactured according to IS: 1492-1970 specifications.
The length of the chain is measured from the outside of one handle to the outside of the other handle.
Brass tallies are provided at every 5-meter mark for quick counting.
Small circular rings connect the links to provide flexibility to the chain.
Metric units facilitate easier calculations compared to Gunter's or Revenue chains.
High durability and easy maintenance in field conditions.
Prone to errors due to changes in temperature (thermal expansion).
Weight of the chain can cause sag, requiring correction in long measurements.
General survey work in civil engineering projects.
Plotting boundaries and land measurement for cadastral surveys.
A 20m chain consists of 100 links; a 30m chain consists of 150 links.
The choice between 20m and 30m depends on the nature of the terrain and the scale of the survey.
C is correct тАФ In standard surveying practice under Indian Standards, 20 m and 30 m are the most widely used lengths for metric chains.
Remember that 20 m chains are preferred for smaller, more precise layouts, while 30 m chains are typically used for extensive field measurements to save time.