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Q: The maximum tolerance in 20m chain is
  • A. ± 2mm
  • B. ± 3mm
  • C. ± 5mm
  • D. ± 8mm
Correct Answer: Option C - Metric chain – Metric chain are made in length 20 m and 30 m. A 20 m chain has 100 links each of 20 cm and 30 m chain has 150 links. Tolerance in chain – For 5 m chain = ±3 mm For 20 m chain = ±5 mm For 30 m chain = ± 8 mm
C. Metric chain – Metric chain are made in length 20 m and 30 m. A 20 m chain has 100 links each of 20 cm and 30 m chain has 150 links. Tolerance in chain – For 5 m chain = ±3 mm For 20 m chain = ±5 mm For 30 m chain = ± 8 mm

Explanations:

Metric chain – Metric chain are made in length 20 m and 30 m. A 20 m chain has 100 links each of 20 cm and 30 m chain has 150 links. Tolerance in chain – For 5 m chain = ±3 mm For 20 m chain = ±5 mm For 30 m chain = ± 8 mm