A combined dewatered cassava mash lump pulverizing and sifting machine was developed to determine the effect\nof moisture content, operating speed, and mash quantity on the performance of the machine using historical data experimental\ndesign of response surface methodology. The independent variable sof the experiments were moisture content, operating speed,\nand mash quantity, while the dependent variables were sifting efficiency, input capacity, and output capacity for both 3 and 5\nmm aperture sieves. The results of the analysis revealed that sifting efficiency for 5 mm aperture sieve ranged from 78.8% to\n89.0%, sifting efficiency for 3 mm aperture sieve ranged from 62.8% to 79.9%, input capacity ranged from 232.29 to 405.25\nkg/hr, output capacity for 5 mm aperture sieve ranged from 56.2 to 97.4 kg/hr, while output capacity for 3 mm aperture sieve\nranged from 45.10 to 87.8 kg/hr.Also,the independent variables were significant (p<0.05) oneach dependent variable. In\naddition, from the model summary statistics, the adequacy of best fit of the model was obtained from the highest value of\ncoefficient of determination (R2), and the least value of standard deviation (SD) and Predicted Residual Sum of\nSquares(PRESS) values.The respective R2, SD, and PRESS values of 0.9759, 0.55, 13.44for sifting efficiency for 5 mm\naperture sieve; 0.9165, 1.52, 114.71for sifting efficiency for 3 mm aperture sieve; 0.9828, 6.98, 2440.04 for input capacity;\n0.9885, 1.57, 103.41for output capacity for 5 mm aperture sieve; and 0.9847, 1.90, 155.91for output capacity for 3 mm\naperture sieve were obtained.Therefore, from the results obtained, the machine is recommended for small and medium scale\ngari processors.
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