Mechanical Operations For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as Np ∝ 1/NRe Np ∝ NRe Np → constant Np ∝ √NRe Np ∝ 1/NRe Np ∝ NRe Np → constant Np ∝ √NRe ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations 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. 1 0.5 1.34 4.34 1 0.5 1.34 4.34 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Filter aid is used to Increase the rate of filtration Act as a support base for the septum Increase the porosity of the cake Decrease the pressure drop Increase the rate of filtration Act as a support base for the septum Increase the porosity of the cake Decrease the pressure drop ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations increasing the capacity of a screen __________ the screen effectiveness. None of these Does not effect Increases Decreases None of these Does not effect Increases Decreases ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Energy requirement (per unit mass of material crushed/ground) is highest for Fluid energy mill Rod mill Ball mill Jaw crusher Fluid energy mill Rod mill Ball mill Jaw crusher ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to The new surface created None of these The size reduction ratio The change in volume due to crushing The new surface created None of these The size reduction ratio The change in volume due to crushing ANSWER DOWNLOAD EXAMIANS APP
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