Mechanical Operations
Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers'?

Both B and C
Screw conveyor
Flight conveyor
Bucket conveyor

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Mechanical Operations
Crushing efficiency is the ratio of the

Energy fed to the machine to the surface energy created by crushing
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 absorbed by the solid to that fed to the machine

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Mechanical Operations
Cumulative analysis for determining surface is more precise than differential analysis, because of the

Fact that screening is more effective
None of these
Assumption that all particles in a single fraction are equal in size, is not needed
Assumption that all particles in a single fraction are equal in size

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