Mechanical Operations Ultracentrifuges running at speeds upto 100000 rpm is normally used for the Dewaxing of lubricating oil Concentration of rubber latex Separation of cream from milk Separation of isotopes based on their density or molecular weights difference Dewaxing of lubricating oil Concentration of rubber latex Separation of cream from milk Separation of isotopes based on their density or molecular weights difference ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake) ∝ √ΔP ∝ ΔP ∝ 1/ ΔP Independent of ΔP ∝ √ΔP ∝ ΔP ∝ 1/ ΔP Independent of ΔP ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Temperature of the product during ultrafine grinding Remains constant Increases May increase or decrease ; depends on the material being ground Decreases Remains constant Increases May increase or decrease ; depends on the material being ground Decreases ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed? Wet grinding in low viscous suspension Wet grinding in high viscous suspension Dry grindng of large particles in un-baffed mills Dry grinding of large particles (upto 1.25 cms) Wet grinding in low viscous suspension Wet grinding in high viscous suspension Dry grindng of large particles in un-baffed mills Dry grinding of large particles (upto 1.25 cms) ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Crushing efficiency is the ratio of the Energy absorbed by the solid to the surface energy created by crushing Surface energy created by crushing to the energy absorbed by the solid Energy fed to the machine to the surface energy created by crushing Energy absorbed by the solid to that fed to the machine Energy absorbed by the solid to the surface energy created by crushing Surface energy created by crushing to the energy absorbed by the solid Energy fed to the machine to the surface energy created by crushing Energy absorbed by the solid to that fed to the machine ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations A gravity decanter is meant for the separation of two __________ density. Miscible liquids of same Miscible liquids of different Immiscible liquids of same Immiscible liquids of different Miscible liquids of same Miscible liquids of different Immiscible liquids of same Immiscible liquids of different ANSWER DOWNLOAD EXAMIANS APP
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