Section 4: Soil and Water Conservation Engineering
Surveying and Levelling
Subtopic: Chain surveying, methods of traversing
Question Statement:
Identify the correct statement related to tape correction in chain surveying:
Options:
(A) Wrong alignment correction is always positive.
(B) Sag correction is always negative.
(C) Slope of tape correction is always positive.
(D) Temperature correction is always negative.
Official Answer Key:
B
Step-by-Step Solution & Explanation
When a tape sags between supports (not fully supported along its length), the measured (chord) length is always shorter than what a straight taut tape would read for the same points, so the correction to be applied is always subtracted (negative). Wrong-alignment and slope corrections are always negative (measured length is always an overestimate), while temperature correction can be positive or negative depending on whether field temperature is above or below the standardization temperature.
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