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 reciprocating tractor mower cutter bar, 'knife register' refers to the condition where:
Options:
(A) The knife section is exactly centered on a ledger plate (guard) at each end of the stroke
(B) The stroke length of the pitman crank exactly equals twice the guard spacing
(C) The cutter bar is aligned strictly perpendicular to the tractor longitudinal axis while stationary
(D) The knife clips are clamped tightly with zero clearance against the wear plate
Answer Key:
A
Step-by-Step Solution & Explanation
- **Register of cutter bar:** A cutter bar is in proper register when the center of each knife section stops directly over the centerline of a guard (ledger plate) at the extreme ends of the stroke (outer and inner dead centers).
- If out of register, the stalks are not completely sheared before the knife reverses direction, leading to clogging and high draft.