Discussion
Consider the following pairs of machine and what it separates:
Thresher - Grain from the head and straw
Maize sheller - Kernels from the cob
Groundnut decorticator - Kernels from the shell
Straw walker - Grain from chaff
How many of the pairs given above are correctly matched?
Answer: C
Correct answer: Only three
Three pairs are right. A thresher separates grain from the head and straw, a maize sheller separates kernels from the cob, and a groundnut decorticator separates kernels from the shell.
The fourth is wrong. Straw walkers separate grain from straw, shaking the straw so that trapped grain falls through. Separating grain from chaff is the cleaning shoe's work, using sieves and an air blast - a different mixture handled at a different stage.
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