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Final... O Search (Alt+0) Howard Rodrigues aw Design Layout References Mailings Review View Help A A Aa to 21 AaBbCcDc AaBbCcDc AaBb C AaBbcc X A0 1 Normal 1 No Spac... Heading 1 Heading 2 Find Replace Select Dictate ont B Paragraph Styles Editing Moice 6. What is the difference between a barrier screw and a double flight screw? a) It is related to barrel dimeter b) It is related to screw core or root diameter as well as channel depth pitch I c) The barrier screw is used for separation of melt and solid, but a double flight increases the melt output. d) Both barrier screw and double flight screw are used for melt separation and increasing flow rate 7. During a mixing operation in polymer extrusion process, what type of the flow is associated with dispersive mixing? a) Low shear rate flow b) Drag flow c) Pressure flow d) Elongational flow