Question
Download Solution PDFWhich of the following is a reason for negative error in chaining?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Following are the chain corrections in measurement of chain length.
- Correction for Sag: When chain is supported at the two ends, then it always sag downwards due to its own weight. Thus apparent length measured is large as compared to the actual length and thus this correction is negative but error is positive.
- Correction for misalignment: This type of error occurs when the survey line is not properly ranged out. The measured distance is always greater than the actual distance and hence this correction is always negative but error is positive.
- Correction for temperature: The correction for temperature is given by,
- Ct = α(Tm-To)L
When,
Tm > To, correction is positive but error is negative.
Tm < To, correction is negative but error is positive.
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