The ‘shanks system’ of leaching (i.e., counter-current multiple contact leaching) is used for________?

Perforated plate towers are unique for solvent extraction because, they provide________?

Pipes having diameter 14 inches or more are designated by their________?

Fourier’s law of heat conduction applies to ________ surfaces?

Mesh indicates the number of holes per________?

Presence of free moisture in coal is most disadvantageous during________?