1. Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the
2. Which of the following is the most suitable for handling fibrous and dense slurries?
3. For efficient grinding, ball mills must be operated
4. Rittinger's crushing law states that
5. Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.
6. The value of 'angle of nip' is generally about
7. A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.
8. What is the selectivity index, if the grade of tailings & concentrate is the same?
9. Sphericity of raschig ring (whose length and diameter are equal) is
10. During size reduction by a jaw crusher, the energy consumed decreases with the
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