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 mower cutter bar, 'knife register' is properly achieved when:
Options:
(A) The knife sections come to rest exactly in the center of the ledger plates (guards) at both outer and inner ends of the pitman stroke
(B) The outer end of the cutter bar has a forward lead relative to the inner shoe
(C) The knife stroke length is twice the guard spacing
(D) The pitman operates at $90^\circ$ to the crank disc at all times
Answer Key:
A
Step-by-Step Solution & Explanation
Knife register is defined as the condition where the center of each knife section aligns precisely with the center of a guard/ledger plate when the crank is at either inner or outer dead center. Improper register leads to ragged cutting, chewing of vegetation, and knife clogging.