Neco 2019 Agricultural Science Question 16

Practice objective / multiple choice question 16 from the 2019 Neco Agricultural Science examination.

Neco 2019 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 16 NECO • 2019 • AGRICULTURAL_SCIENCE • objective

A tractor engine delivers \(50\ \text{kW}\) at \(1800\ \text{rpm}\). The transmission has a gear ratio of \(4:1\) (engine to wheels) and the wheel radius is \(0.75\ \text{m}\). The plough requires a drawbar pull of \(12\ \text{kN}\) to operate at a speed of \(5\ \text{km/h}\). Assuming an overall drivetrain efficiency of \(85\%\), determine whether the tractor can maintain the required speed and pull. Also compute the fuel consumption per hour if the engine specific fuel consumption is \(210\ \text{g/kWh}\).

Answer Options

A. No, the tractor cannot provide the required drawbar pull. Maximum tractive force is about 2.5 kN (still below 12 kN). Fuel consumption is 12.0 kg per hour.
B. Yes, the tractor can provide the required drawbar pull. Maximum tractive force is about 13.5 kN, exceeding the 12 kN demand. Fuel consumption is 9.8 kg per hour.
Correct Answer C. No, the tractor cannot provide the required drawbar pull. Maximum tractive force is about 1.20 kN (far below 12 kN). Fuel consumption is 10.5 kg per hour.
D. No, the tractor cannot provide the required drawbar pull. Maximum tractive force is about 1.20 kN (far below 12 kN). Fuel consumption is 8.4 kg per hour.
Correct Answer
C
Correct Option:
No, the tractor cannot provide the required drawbar pull. Maximum tractive force is about 1.20 kN (far below 12 kN). Fuel consumption is 10.5 kg per hour.

About This Question

This is Neco 2019 Agricultural Science Question 16. It is one of the objective questions from the 2019 Neco Agricultural Science examination.

Difficulty level: Medium .

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