Discussion
Consider the following statements about an air screen cleaner:
1. It combines size and aerodynamic separation in one machine.
2. Its aspiration air velocity must sit between the terminal velocities of chaff and grain.
3. It can remove stones from grain.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 describe the machine correctly: it combines screens with an aspiration stream, and that stream must be set between the terminal velocities of the chaff and the grain. Statement 3 is beyond it - a stone of the same size and terminal velocity as the grain passes both the screens and the air, which is why a separate destoner is needed.
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