Subtopic: Functional requirements, principles of working, construction and operation of manual, animal, tractor and renewable energy operated equipment for tillage, sowing, planting, fertilizer application, inter-cultivation, spraying, mowing, chaff cutting, harvesting and threshing
Question Statement:
In combine harvester threshing systems, the axial-flow rotor differs from the conventional transverse cylinder because crop material moves:
Options:
(A) Helically along the longitudinal axis of the rotor, making multiple passes over the concave for gentler threshing and separation
(B) Tangentially across a 100-degree arc in a fraction of a second
(C) Purely radially
(D) In opposite direction to rotor rotation
Answer Key:
A
Step-by-Step Solution & Explanation
Axial flow combines spiral crop repeatedly ($3-4$ turns) over full-length concaves and grates, providing superior grain separation with drastically reduced kernel impact cracking.