Discussion
Terminal velocities of the components of a harvested wheat sample.
| Component | Terminal velocity (m/s) |
|---|---|
| Dust and fine chaff | 1.2 |
| Straw fragments | 3.5 |
| Shrivelled grain | 6.5 |
| Sound grain | 9.5 |
Which air velocity removes dust, straw and shrivelled grain while retaining sound grain?
Answer: B
Correct answer: 8.0 m/s
The velocity must lie above the terminal velocity of everything to be removed and below that of what is to be kept. Shrivelled grain is the heaviest of the unwanted fractions at 6.5 m/s and sound grain the lightest of the wanted at 9.5, so anything between those figures serves; 8.0 m/s sits comfortably in the middle. At 10.0 the sound grain would go too, and at 5.0 the shrivelled grain would stay.
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