A pipe-insulation acceptance test requires the outer surface to stay at least 3°F above the measured ambient dew point. Dew point is 60°F and surface temperature is 61°F. Does it meet the stated margin?
- AYes; every surface above 60°F meets a 3°F margin.
- BYes; 61°F is 3°F above 60°F.
- No; the required surface temperature is at least 63°F.
- DNo; the required surface temperature is 57°F.
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why C is correct
The required threshold is 60 + 3 = 63°F. The measured surface misses it by 2°F. This tests a supplied design margin, not a universal insulation thickness.