GATE AG 2012 • Q53 MCQ • 2 Marks

Section 2: Farm Machinery

Farm Machinery

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:

For the planter of Q.52, the angular speed ratio of metering disc to ground wheel for obtaining the desired plant population is:

Options:

  • (A) 0.125:1
  • (B) 0.150:1
  • (C) 0.225:1
  • (D) 0.250:1

Official Answer Key:

A

Step-by-Step Solution & Explanation

Seeds required per m of row = plant population per m² × row spacing ÷ germination fraction. Plants/ha = 44800 → plants/m² = 4.48. Seeds/m² needed (accounting for germination) = 4.48/0.84 = 5.333/m². Per metre of row (width 0.75 m): seeds/m row = 5.333×0.75 = 4.0 seeds/m. Distance covered per wheel revolution = π×0.49 = 1.539 m, giving 4.0×1.539 = 6.16 seeds needed per wheel revolution. Disc drops 54 seeds/rev, so speed ratio (disc:wheel) = 6.16/54 = 0.114 ≈ 0.125:1. Answer: A. Section 3 — Farm Power

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