Discussion
Assertion (A): An aspirator's air velocity should be set as high as the fan allows.
Reason (R): Light chaff has a much lower terminal velocity than sound grain.
Select the correct answer from the options below.
Answer: D
The reason is correct and it condemns the assertion: above the grain's own terminal velocity the product is carried away with the trash. The setting must sit somewhere between the two terminal velocities and nowhere else.
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