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 rotary disc mower cutting forage grasses without ledger plates (impact cutting), the required minimum knife tip peripheral speed is:
Options:
(A) $70$ to $85\text{ m/s}$
(B) $10$ to $15\text{ m/s}$
(C) $150$ to $200\text{ m/s}$
(D) $2$ to $5\text{ m/s}$
Answer Key:
A
Step-by-Step Solution & Explanation
Without a stationary ledger plate counter-edge, cutting relies entirely on stalk inertia, requiring very high knife tip speeds ($70-85\text{ m/s}$) to cleanly sever stems.