Neco 2024 Agricultural Science Question 4

Practice practical question 4 from the 2024 Neco Agricultural Science examination. This question covers Farm Machinery .

Neco 2024 Agricultural Science Practical

Topic: Farm Machinery

Question 4 NECO • 2024 • AGRICULTURAL_SCIENCE • practical

A small agricultural tractor is to be used for pulling a two‑bottom plough. The tractor’s engine is rated at 20 kW and develops its maximum power at 2000 rpm. The gearbox has a third‑gear ratio of 1.8:1 (engine speed : gearbox output speed). The final‑drive ratio (gearbox output to wheel) is 3.5:1. The wheels have a radius of 0.50 m. When operating in third gear the tractor moves at a ground speed of 4 km h⁻¹. The drivetrain suffers an overall efficiency loss of 15 %. The plough requires a draft (pulling) force of 2.5 kN. The engine’s specific fuel consumption is 250 g kWh⁻¹ and the density of diesel is 0.85 kg L⁻¹. The tractor is to be used for 2 h under these conditions.

( a )

Calculate the torque produced by the engine at 2000 rpm (in N·m, to one decimal place).

( b )

Determine the torque available at the wheel axle after the gearbox and final‑drive (before efficiency loss) (in N·m, to one decimal place).

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This is Neco 2024 Agricultural Science Question 4. It is one of the practical questions from the 2024 Neco Agricultural Science examination.

The question covers Farm Machinery .

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