Neco Model Questions Vol1 2020 Agricultural Science Question 15

Practice objective / multiple choice question 15 from the 2020 Neco Model Questions Vol1 Agricultural Science examination.

Neco Model Questions Vol1 2020 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 15 NECO_MODEL_QUESTIONS_VOL1 • 2020 • AGRICULTURAL_SCIENCE • objective

A rotary tiller requires a torque of 250 Nm at 250 rpm to operate efficiently. The farmer has a diesel engine that delivers 12 kW at 1800 rpm. The engine power is transmitted to the tiller through a two‑stage belt drive: the first stage has a reduction ratio of 3 : 1 and the second stage a reduction ratio of 2 : 1 (both ideal, i.e., no losses). Determine the output speed and torque after the two reductions and state whether the tiller can be driven satisfactorily.

Answer Options

A. Yes; after reductions the tiller would run at 300 rpm with torque 382 Nm, meeting both speed and torque requirements.
B. No; after reductions the tiller would run at 250 rpm with torque 300 Nm, which meets the speed but not the torque requirement.
Correct Answer C. No; after reductions the tiller would run at 300 rpm with torque 382 Nm, which exceeds the required speed of 250 rpm, so the speed requirement is not met.
D. Yes; after reductions the tiller would run at 200 rpm with torque 500 Nm, satisfying both requirements.
Correct Answer
C
Correct Option:
No; after reductions the tiller would run at 300 rpm with torque 382 Nm, which exceeds the required speed of 250 rpm, so the speed requirement is not met.

About This Question

This is Neco Model Questions Vol1 2020 Agricultural Science Question 15. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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