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According to the Indian Standard Institute (ISI), which among the following designation has the size 1000 x 700 (in mm)?

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According to the Indian Standard Institute (ISI), which among the following designation has the size 1000 x 700 (in mm)?

(a) B0

(b) B1

(c) B2

(d) B3

The question was asked in my homework.

My question is from Drawing Tools and their Uses topic in portion Drawing Instruments, Sheet Layout & Free-Hand Sketching of Engineering Drawing

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The correct choice is (b) B1

Explanation: The designation B1 is 1000 x 700 mm in size whereas B0, B2 and B3 designations are 1500 x 1000 mm, 700 x 500 mm and 500 x 300mm respectively. These designations denote the dimensions of the drawing boards. Standard dimensions are used to simplify the production process.

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