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Which of the following limit should be 30m chain in when testing?
┬▒ 5mm
┬▒ 10mm
┬▒ 8mm
┬▒ 3mm
┬▒ 8mm
According to IS 1492 (Indian Standards for Surveying Chains), the permissible error in the length of a 30m chain is ┬▒ 8mm ┬╖ This tolerance ensures the accuracy required for high-precision chain surveying in field conditions.
According to IS 1492 (Indian Standards for Surveying Chains), the permissible error in the length of a 30m chain is ┬▒ 8mm ┬╖ This tolerance ensures the accuracy required for high-precision chain surveying in field conditions.
EpermтАЛ=┬▒8┬аmm тАФ Standard tolerance for 30m chain length
Chains are subject to wear, elongation, and deformation of the links during field operations ┬╖ Testing for length error is essential to calibrate the equipment before use, where the chain is pulled under a standardized tension (usually 8kg) on a flat, level surface and compared against a standard baseline.
The 20m chain has a permissible error of ┬▒ 5mm.
Testing must be performed under a standardized tension of 8kg.
Errors arise due to wear at the joints and physical stretching of links.
Regular calibration is mandatory to maintain surveying precision.
Ensures consistency in measurements.
Reduces systematic errors in large-scale mapping.
Field testing requires a standardized baseline.
Frequent wear necessitates repeated adjustments.
Cadastral surveys
Topographic mapping
Field calibration of engineering instruments
| Feature | 20m Chain | 30m Chain |
|---|---|---|
Chain Length | ┬▒ 5mm | ┬▒ 8mm |
If the error exceeds ┬▒ 8mm for a 30m chain, the links must be adjusted or replaced.
Option A (┬▒ 5mm) is the correct tolerance for a 20m chain, not a 30m chain.
C is correct тАФ The Indian Standard specification for a 30m chain allows a permissible error of ┬▒ 8mm.
Always remember the pairing: 20m chain is ┬▒ 5mm and 30m chain is ┬▒ 8mm; this is a frequent objective question in surveying exams.