Question Bank • QB_APE_EXP_045 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Processing of Agriculture Produce

Subtopic: Processing of seeds, spices, fruits and vegetables

Question Statement:

Mustard seeds containing $38.0\%$ oil are crushed in a mechanical screw press (expeller). The residual cake contains $8.0\%$ oil by weight. Neglecting moisture variations, the oil extraction efficiency of the expeller in percentage is ________ (round off to 2 decimal places).

Answer Key:

83.65

Step-by-Step Solution & Explanation

Basis: $100\text{ kg}$ seeds. • Initial oil = $38.0\text{ kg}$ • Non-oil solid residue $R = 100 - 38.0 = 62.0\text{ kg}$ In the cake containing $8\%$ oil: $R = \text{Cake} \times (1 - 0.08) = 0.92 \times \text{Cake} = 62.0\text{ kg}$ $\text{Cake weight} = \frac{62.0}{0.92} \approx 67.391\text{ kg}$ Oil remaining in cake: $\text{Oil in cake} = 67.391 \times 0.08 \approx 5.391\text{ kg}$ Oil extracted = $38.0 - 5.391 = 32.609\text{ kg}$. Extraction efficiency: $\eta = \frac{32.609}{38.0} \times 100 = 85.81\%$ (Wait: $\frac{32.609}{38.0} = 85.81\%$. Setting correct_answer: "85.81", range min: 85.2, max: 86.4).
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