tehnoloogiline proov koksi tugevuse määramiseks ligikaudselt sarnase suurusega koksi kindlaksmääratud kõrguselt, ettenähtud kordade arvuga kukutamise teel terasplaadile (vt koks; vrd koksi trumliproov), a coke strength test consisting in dropping a weighted amount of coke lumps of nearly uniform size contained in a special receptable, from a fixed height to a steel plate a specified number of times; the weights remaining on suitably selected sieves are a measure of the coke strength (see: coke; compare: tumbler test)