Discussion
Identify the correct statement related to tape correction in chain surveying:
Answer: B
The correct statement is Sag correction is always negative.
A tape suspended between two supports hangs in a curve, so the straight distance between the ends is shorter than the length read on the tape. The measured length is always too long, and the sag correction is always subtracted.
The correction for wrong alignment is also always negative, for the same reason (a crooked line is longer than the straight one), so 'always positive' is wrong. The slope correction is always negative too, since the horizontal distance is shorter than the slope distance. The temperature correction can have either sign: positive when the field temperature is above the standard temperature and negative when it is below.
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