Mechanical Operations Questions

• In case of a hammer crusher, the final product size depends on the
• 200 mesh seive size corresponds to __________ microns.
• For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a
• Screen efficiency is
• Supporting legs of a plate and frame filter is normally made of
• Sedimentation on commercial scale occurs in
• Which of the following is not an industrial screening equipment?
• Pine oil and cresylic acid are used as __________ in the froth floatation process.
• Which of the following is not used as a filter medium in case of corrosive liquids?
• Apron conveyors are used for
• The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).
• Pick out the correct statement.
• With increase in drum speed, in a rotary drum filter, the filtration rate
• Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.
• The grinding in a hammer crusher takes place due to the
• The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of diameter di and mass mi (i = 1, 2, 3, ...... ∞) is given by
• Float and sink test determines the possibility of cleaning of coal by a process based on the
• __________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.
• Which of the following is not a non-metalliferous mineral?
• For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.