Mechanical Operations
Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface.

Ribbed
Curved
Plane
Either A or B

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Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

British standard screens
American standard screens (ASTM and Tyler standard screens)
All of these
German standard screens (DIN 1171) etc

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