What is the slope of the operating line in the rectifying section of a distillation column ?

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In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is__________________?

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Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from ?

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Fresh water carrying pipelines in chemical industries are coloured with _______________ color?

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