Mechanical Operations Questions

• Close circuit grinding by a ball mill with air sweeping employs a
• Gelatinous solid (which plug the septum) can be filtered by a __________ filter.
• Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their
• Toothed roll crushers achieve size reduction by
• Which of the following oxides is not present in hematite iron ore?
• Choke crushing (in case of a Jaw crusher) compared to free crushing
• Traces of liquid tar fog present in coke oven gas is separated using
• In constant pressure filtration,
• Angle of nip of the crushing rolls does not depend upon the
• Shell and leaf filter as compared to plate and frame filter
• 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.
• __________ are mixed using ribbon blenders.
• The critical speed of a trommel (N) is related to its dia (D) as
• The process by which fine solids is removed from liquids is termed as
• For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to
• Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?
• Which of the following achieves the least reduction ratio for a given feed size?
• As per Taggart's formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms )
• Which of the following crushing laws is most accurately applicable to the fine grinding of materials?
• For coarse reduction of hard solids, use