Discussion
Preferred standard scales for engineering drawings are chosen so that
Answer: C
Correct answer: the ratio is a simple multiple of 1, 2 or 5
Standard scales run 1:1, 1:2, 1:5, 1:10, 1:20, 1:50 and so on, so that the mental arithmetic of converting a scaled length is easy and a familiar set of scale rules serves every drawing. An arbitrary ratio such as 1:37 would be correct but would need a scale constructed specially and computation at every reading.
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