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Length of scale (LOS) = ______ × ______

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Length of scale (LOS) = ______ × ______

(a) Max. Length and R.F

(b) R.F and Min. length

(c) R.I and Max. Length

(d) E.I and Max. Length

This question was posed to me during an interview.

My question is taken from Scales in section Lettering Practice, Scales & Curves of Civil Engineering Drawing

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Right choice is (a) Max. Length and R.F

Best explanation: Representative fraction (R.F.) = (Length of object on the drawing)/(Actual length of the object). If the R.F is known and the maximum length of the actual area is given, then we can find the length of scale and after which the drawing is executed below the max. length of scale. It is calculated by the following formula: Length of scale = (RF x Maximum distance to be represented).

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