Specific surface area is the surface area of a unit _______________ of materials?

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In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?

A. Secondary B. Fine C. Primary D. Ultrafine...

Pick out the wrong statement ?

A. More commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the later one B. There are only four methods namely compression, impact, attrition and cutting, which the size reduction equipments employ C. Cutting machines mainly employ ‘attrition’ for size reduction of solids D. Operating principles of Dodge and Blake jaw … Pick out the wrong statement ?Read More...

Sphericity of pulverised coal is__________________?

A. 1 B. < 1 C. > 1 D. ∞...

Which of the following is not a wet classifier ?

A. Sharpies super-centrifuge B. Hydrocyclones C. Dorr Oliver rake classifier D. None of these...

Froth floatation is the most suitable for treating ____________________?

A. Iron ores B. Sulphide ores C. Quartzite D. None of these...