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Q: Which of the following is a reason for negative error in chaining?
  • A. Rise in temperature
  • B. Sag in chain
  • C. Chain getting out of line due to wrong ranging
  • D. Chain not being straight
Correct Answer: Option A - Variation in Temperature–When a chain or tape is used at temperature different from that at which it was calibrated it's length changes. Due to the rise in the temperature, the length of the chain increases. The measured distance is thus less and the error become negative Due to the fall in temperature, the length decreases. The measured distance is thus more and the error becomes positive. Sag in chain–The error is cumulative and positive Bad ranging = cumulative + Tape not stretched horizontally = cumulative + Variation in pull = cumulative ±
A. Variation in Temperature–When a chain or tape is used at temperature different from that at which it was calibrated it's length changes. Due to the rise in the temperature, the length of the chain increases. The measured distance is thus less and the error become negative Due to the fall in temperature, the length decreases. The measured distance is thus more and the error becomes positive. Sag in chain–The error is cumulative and positive Bad ranging = cumulative + Tape not stretched horizontally = cumulative + Variation in pull = cumulative ±

Explanations:

Variation in Temperature–When a chain or tape is used at temperature different from that at which it was calibrated it's length changes. Due to the rise in the temperature, the length of the chain increases. The measured distance is thus less and the error become negative Due to the fall in temperature, the length decreases. The measured distance is thus more and the error becomes positive. Sag in chain–The error is cumulative and positive Bad ranging = cumulative + Tape not stretched horizontally = cumulative + Variation in pull = cumulative ±