Discussion
An aspirator must lift chaff of terminal velocity \( 2.5 \) m/s while retaining grain of terminal velocity \( 9.0 \) m/s. A suitable air velocity is
Answer: D
Correct answer: 5.0 m/s
The air velocity must lie between the two terminal velocities: above \( 2.5 \) m/s so the chaff is lifted, and below \( 9.0 \) m/s so the sound grain is not. A velocity of \( 5.0 \) m/s sits comfortably between them.
The setting is a compromise. Nearer the lower figure, some chaff escapes removal; nearer the upper, sound but light grain is carried away with it. Adjustable air control is therefore standard, and the operator sets it by inspecting the rejected fraction for good grain.
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