GATE AG 2025 • Q20 MCQ • 1 Mark

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:

Mustard seeds (bulk density = 800 kg/m³) are sown with a four-row fluted roller seed drill, 25 cm row spacing, at 2.5 km/h. For a desired seed rate of 5.0 kg/ha, find the volumetric flow rate of seeds from the machine (m³/h).

Options:

  • (A) 0.391×10⁻³
  • (B) 1.172×10⁻³
  • (C) 1.563×10⁻³
  • (D) 1.953×10⁻³

Official Answer Key:

C

Step-by-Step Solution & Explanation

Area covered/h = (rows × spacing × speed) = 4 × 0.25 m × 2500 m/h = 2500 m²/h = 0.25 ha/h. Mass flow = seed rate × area/h = 5.0 kg/ha × 0.25 ha/h = 1.25 kg/h. Volume flow = mass/density = 1.25/800 = 1.5625×10⁻³ m³/h.

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