Mechanical Operations Questions

• 200 mesh screen means 200 openings per
• The capacity of a pneumatic conveying system depends upon the
• Which of the following is the most suitable for handling fibrous and dense slurries?
• Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is
• Diatomaceous earth is a/an
• Highly viscous liquids & pastes are agitated by
• The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is
• Jigging is a technique by which different particles can be
• Tabular bowl centrifuges as compared to disk bowl centrifuges
• Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
• In case of a ball mill,
• Pine oil used in froth floatation technique acts as a/an
• The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
• Fibrous material is broken by a
• Grindability of a material does not depend upon its
• Dust laden air can be purified using a
• Crushing efficiency is the ratio of the
• Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm)
• Feed size of ≥ 25 cms can be accepted by
• For transporting pasty material, one will use a/an