GATE AG 2025 • Q33 NAT • 1 Mark

Section 6: Agricultural Process Engineering

Evaporation and Drying

Subtopic: Hydrothermal treatments

Question Statement:

Find the water needed to raise the moisture content of 50 kg paddy grains from 13% (d.b.) to 35% (d.b.) in a hydrothermal treatment process (kg). (Rounded to 2 decimal places)

Official Answer Key:

9.70 to 9.80

Step-by-Step Solution & Explanation

Dry-matter mass (constant): Md = 50/(1+0.13) = 44.248 kg. Final wet mass at 35% d.b. = Md×(1+0.35) = 44.248×1.35 = 59.735 kg. Water to be added = 59.735 − 50 = 9.73 kg.

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