26. To remove dirt from the flowing fluid, we use a
27. The term 'angle of nip' is concerned with the operation of the __________ crushers.
28. There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.
29. Filtration of water in a paper mill is done by a/an __________ filter.
30. Maximum size reduction in a ball mill is done by the, __________ action.
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