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 a thresher, the cylinder separation efficiency can be improved by increasing
Options:
(A) cylinder diameter
(B) cylinder speed
(C) cylinder-concave clearance
(D) feed rate
Official Answer Key:
B
Step-by-Step Solution & Explanation
Cylinder (threshing) separation efficiency depends on the intensity of impact and rubbing action delivered to the crop mat, which increases with peripheral speed of the cylinder — higher cylinder speed improves grain-straw separation at the cylinder itself. (A) cylinder diameter alone (without speed) does not directly raise impact intensity. (C) increasing cylinder-concave clearance REDUCES the rubbing/impact intensity, lowering separation efficiency. (D) higher feed rate increases the crop mat thickness, reducing the effectiveness of threshing action and lowering separation efficiency. Answer: (B).
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