Discussion
A drawing shows the same overall length dimensioned as 240 mm on one view and 245 mm on another. The correct action is
Answer: B
Correct answer: query the drawing, since a dimension must appear once only
Two different figures for the same length mean the drawing is wrong, and nothing on it says which figure is right - one of them is probably a revision that was not carried through. Averaging, or choosing the safer-looking value, is guessing at the designer’s intent. The rule that a dimension appears once exists precisely to prevent this situation arising.
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