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 cutter bar mower, the cutter bar drive consists of an offset slider crank mechanism with a crank of radius 36 mm and a pitman of length 360 mm. If offset of the crank is 72 mm, the stroke length in mm would be
Options:
(A) 36.0
(B) 72.0
(C) 73.5
(D) 80.5
Official Answer Key:
C
Step-by-Step Solution & Explanation
For an offset slider-crank mechanism, the two extreme slider positions correspond to the crank aligned toward and away from the offset line. Stroke length s = √[(l+r)² − e²] − √[(l−r)² − e²], where l = pitman (connecting-rod) length = 360 mm, r = crank radius = 36 mm, e = offset = 72 mm. Computing: √[(396)² − 72²] − √[(324)² − 72²] = √(156816−5184) − √(104976−5184) = √151632 − √99792 = 389.4 − 315.9 = 73.5 mm, matching option (C).
Practice This in Real CBT Exam Interface
Test yourself with the official TCS-iON palette, virtual calculator, and immediate performance analytics.