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:
A 5 × 20 cm seed drill has a ground drive wheel of rolling diameter 0.5 m. While testing under laboratory condition, 320 g of seeds were collected in 20 revolutions of the ground drive wheel. The same seed drill when operated in a 2 ha field, amount of seeds dropped was found to be 185 kg. The variation in the seed dropped between laboratory and field conditions due to skid of ground drive wheel is ________ (Take π = 3.14)
Options:
(A) 6.38%
(B) 9.23%
(C) 10.17%
(D) 12.26%
Official Answer Key:
C
Step-by-Step Solution & Explanation
• Width = 5×20cm = 1m. Field distance = 20000m²/1m = 20000m. Wheel circumference = 3.14×0.5=1.57m. Revolutions in field = 20000/1.57 = 12738.85.
• Lab seed rate = 320/20 = 16 g/rev. Expected drop = 16×12738.85 = 203.82 kg.
• Variation relative to expected = |203.82−185|/203.82×100 = 9.23% (matches option B, not the key).
• Cross-check relative to the actual field-measured value: 18.82/185×100 = 10.17% — matches the official key, indicating the examiner's intended base is the actual field-measured seed drop.
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