When using a transit for site layout, what is the maximum acceptable error for a right angle measurement?
Correct Answer
C) 1 minute
Professional surveying standards require angle measurements to be within 1 minute of arc for construction layout work. This ensures the building will be square and meet dimensional tolerances required by building codes.
Why This Is the Correct Answer
Professional surveying standards for construction layout require angle measurements to be within 1 minute of arc to ensure structural integrity and code compliance. This precision level prevents cumulative errors that could cause significant dimensional problems in large buildings. The 1-minute tolerance ensures that buildings remain square and meet the tight dimensional tolerances required by modern building codes. Any greater error could result in out-of-square foundations, misaligned structural elements, and potential code violations.
Why the Other Options Are Wrong
Option A: 2 minutes
10 minutes of error is extremely excessive and would result in major dimensional and squareness problems that would likely violate building codes and create structural issues.
Option B: 5 minutes
2 minutes of error is too large for professional construction layout work and could result in noticeable dimensional problems, especially on larger buildings where small angular errors compound over distance.
Memory Technique
Remember '1 minute = 1st class construction' - professional construction layout demands the highest precision of 1 minute of arc
Reference Hint
Florida Building Code Chapter 18 - Soils and Foundations, or surveying standards section in construction reference materials
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