QUESTION $1$

Estimate the screen area required to handle $1000$ tonnes of the dry crushed ore on a clear opening $80$ mm square screen. $32\%$ of the feed is plus $80$ mm and $45\%$ is minus $40$ mm$.$ If the manufacturers have screens of width $1\mathrm{.}8$ m$,$ what will be the length of the screen.

QUESTION $2$

A quarry manager intends to buy a jaw crusher to deliver $7-$inch material at a capacity of $520$ tonnes per hour. a Find the model of crusher he should buy. b Estimate the expected product size distribution when the granite is crushed.

c If particles of size above $203$ mm will be delivered for sea defense wall construction, estimate the tonnage of material to be discharged for that purpose per hour.

d$.$ The jaw crusher product between $203$ and $102$ mm will be forwarded to a road contractor for filling an excavated clay seam within a section of the road. Estimate the tonnage of material that can be delivered for a twelve$-$hour period.

e$.$ The minus $102$ mm $(4$ inch$)$ material is to be crushed further in a cone crusher to a product size of minus $25$ mm$.$ Please propose the appropriate cone crusher.