Subtopic: Cost analysis of implements and tractors
Question Statement:
The path traced by the material threshed between the cylinder and the concave of an axial flow thresher is
Options:
(A) straight single pass and perpendicular to the cylinder shaft
(B) curved and perpendicular to the cylinder shaft
(C) helical and several times
(D) straight and parallel to the cylinder shaft
Official Answer Key:
C
Step-by-Step Solution & Explanation
In an axial-flow thresher the crop material is conveyed along the axis of the cylinder while simultaneously being rotated around it by the helical rasp bars/spiral vanes, so the material spirals through the threshing zone multiple times before exiting — giving repeated, thorough threshing action. This traces a helical path, several times around the cylinder, not a single straight or perpendicular pass (which describes conventional tangential-flow threshers). Answer: (C).
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