Neco Model Questions Vol1 2021 Agricultural Science Question 47

Practice objective / multiple choice question 47 from the 2021 Neco Model Questions Vol1 Agricultural Science examination.

Neco Model Questions Vol1 2021 Agricultural Science Objective / Multiple Choice Hard Difficulty
Question 47 NECO_MODEL_QUESTIONS_VOL1 • 2021 • AGRICULTURAL_SCIENCE • objective

A farmer harvests 5 tonnes of fresh cassava roots that contain 65 % moisture (wet basis). He wants to dry the roots to a final moisture content of 12 % for safe storage. The dryer removes water at a base rate of 2 kg h⁻¹ per tonne of material when its efficiency is 100 %. However, the drying efficiency declines linearly with moisture content: at 65 % moisture the efficiency is 100 % and at 30 % moisture it is 60 %. Determine (a) the total drying time required to reach 12 % moisture, (b) the weight of the dried cassava, and (c) the percentage loss in weight relative to the original fresh weight.

Answer Options

A. Drying time ≈ 720 h; final weight ≈ 1.8 t; weight loss ≈ 64 %
B. Drying time ≈ 500 h; final weight ≈ 2.2 t; weight loss ≈ 55 %
C. Drying time ≈ 600 h; final weight ≈ 2.0 t; weight loss ≈ 58 %
Correct Answer D. Drying time ≈ 662 h; final weight ≈ 1.99 t; weight loss ≈ 60.2 %
Correct Answer
D
Correct Option:
Drying time ≈ 662 h; final weight ≈ 1.99 t; weight loss ≈ 60.2 %

About This Question

This is Neco Model Questions Vol1 2021 Agricultural Science Question 47. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Agricultural Science examination.

Difficulty level: Hard .

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