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 pneumatic precision seed drill, the vacuum pressure required to reliably hold maize seeds on a perforated vertical disc is typically in the range of:
Options:
(A) $2.5$ to $4.0\text{ kPa}$ ($25$ to $40\text{ mbar}$)
(B) $50$ to $100\text{ kPa}$
(C) $0.01$ to $0.05\text{ kPa}$
(D) $1000\text{ kPa}$
Answer Key:
A
Step-by-Step Solution & Explanation
Operating vacuum between $2.5-4.0\text{ kPa}$ provides sufficient aerodynamic suction force to retain large seeds (corn, cotton) against gravity and vibration.