Mechanical Operations MCQs

Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.

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.

Reciprocal of sphericity is termed as the

Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.

In case of a hammer crusher, the

Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

The crushed material received for separation is called feed or

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.

A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is