Gce Model Questions Vol1 2017 Agricultural Science Question 13

Practice objective / multiple choice question 13 from the 2017 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2017 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 13 GCE_MODEL_QUESTIONS_VOL1 • 2017 • AGRICULTURAL_SCIENCE • objective

A farmer must plough a 3 ha field of heavy clay (moisture content 20 %). Two ploughs are available:\n\n- Moldboard plough: draft requirement \(15\) kN ha\(^{-1}\), effective width \(0.30\) m.\n- Disc plough: draft requirement \(10\) kN ha\(^{-1}\), effective width \(0.25\) m, but on heavy clay its effective working width is reduced by 30 %.\n\nThe tractor can deliver a maximum continuous draft of \(30\) kN and can travel at a constant speed of \(5\) km h\(^{-1}\). Assuming an 8‑hour working day, determine which plough (if any) allows the farmer to complete the whole field in a single day.

Answer Options

Correct Answer A. Only the disc plough meets the draft limit, but it would require about 34.3 hours, so the field cannot be completed in one 8‑hour day.
B. Neither plough meets the draft limit, so the field cannot be completed in a single day.
C. Both ploughs meet the draft limit, and the disc plough would finish the field in about 7.5 hours, so it can be completed in one 8‑hour day.
D. Only the moldboard plough meets the draft limit, and it would require about 6.2 hours, so the field can be completed in one day.
Correct Answer
A
Correct Option:
Only the disc plough meets the draft limit, but it would require about 34.3 hours, so the field cannot be completed in one 8‑hour day.

About This Question

This is Gce Model Questions Vol1 2017 Agricultural Science Question 13. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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