Amotorized dewatered cassava mash sifter developed at the National Centre for Agricultural Mechanization (NCAM) was evaluated to determine the effects of operating speed on its sifting efficiency. Four operating speeds were chosen for the study, these are, 450, 500, 600 and 650 rpm. The machine was allowed to run, and the time required completing the sifting of 15 kg dewatered mash sample at all the tested speeds were noted and recorded. Statistical analysis of variances showed that the speed had significant effect on the sifting efficiency of the sifter at 5% significant level. The highest sifting efficiency achieved was 86.5% at an operating speed of 650 rpm while the lowest efficiency achieved was at 75.5% while operating at a speed of 450 rpm. Increasing operating speed increases the sifting efficiency of the machine.
Key words: Sifting, efficiency, dewatered cassava mash, sifter, speed.
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