Discussion
Match each property in List I with the equipment it principally governs in List II.
List I
A. Terminal velocity
B. Angle of repose
C. Rupture force
D. Porosity
List II
1. Hopper and chute slopes
2. Aspirator air settings
3. Airflow resistance in a drying bed
4. Sheller and thresher clearances
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
Terminal velocity sets aspirator air settings, since the air speed must sit between the terminal velocities of the fraction to be lifted and the fraction to be kept. The angle of repose sets hopper and chute slopes, which must exceed it for discharge.
Rupture force sets sheller and thresher clearances, which must break the hull without cracking the kernel. Porosity governs airflow resistance in a drying bed, because the air travels through the void space and a lower void fraction means a larger pressure drop for the same flow. Each pairing is the property that actually enters the relevant design calculation.
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