23.
The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the

27.
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is

28.
Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.

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