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:
While carrying out tillage operations, negative slip is sometimes experienced with
Options:
(A) front wheels of two-wheel drive tractor
(B) front wheels of four-wheel drive tractor
(C) front wheels of front wheel assisted tractor
(D) wheels of power tiller pulling a mould board plough
Official Answer Key:
C
Step-by-Step Solution & Explanation
Front-wheel-assist (MFWD) tractors are geared to run the front axle slightly faster ('lead') than the rear so the front wheels pull rather than drag. When the front wheels are mechanically forced to rotate faster than the ground speed dictates (e.g. on firm/transport surfaces or when the rear wheels are doing most of the work), the front wheel's actual travel speed exceeds its theoretical (rolling) speed — this is negative slip. A 2WD tractor (A) has no driven front axle, so the concept doesn't apply; a true 4WD (B) is usually matched, not over-geared; a power tiller (D) is walking-type and not subject to this front/rear lead effect.
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