Question Bank • QB_FM_ADV_050 NAT • 2 Marks

Section 2: Farm Machinery

Farm Machinery

Subtopic: Calculation of performance parameters – field capacity, efficiency, performance index, application rate and losses

Question Statement:

During a field performance evaluation of a combine harvester in a paddy field with a potential biological yield of $4500\text{ kg/ha}$, the measured losses are: header pre-cut and shatter loss $= 45\text{ kg/ha}$, cutter bar cutter loss $= 60\text{ kg/ha}$, threshing cylinder unthreshed loss $= 30\text{ kg/ha}$, straw walker rack separation loss $= 40\text{ kg/ha}$, and cleaning shoe grain loss $= 25\text{ kg/ha}$. The total combine harvesting loss expressed as a percentage of biological crop yield is ________ $\%$ (round off to 2 decimal places).

Answer Key:

4.44

Step-by-Step Solution & Explanation

``` Combine Loss Components Breakdown: Header Pre-cut + Cutter Bar: 45 + 60 = 105 kg/ha Threshing Cylinder Loss: 30 kg/ha Straw Walker Loss: 40 kg/ha Cleaning Shoe Loss: 25 kg/ha ``` **Step-by-step Calculation:** 1. Sum of all machine grain losses ($L_{\text{total}}$): $L_{\text{total}} = 45 + 60 + 30 + 40 + 25 = 200\text{ kg/ha}$ 2. Total percentage loss relative to potential biological crop yield ($Y = 4500\text{ kg/ha}$): $\text{Loss } (\%) = \frac{L_{\text{total}}}{Y} \times 100 = \frac{200\text{ kg/ha}}{4500\text{ kg/ha}} \times 100 = \frac{20}{4.5} = 4.444\% \approx 4.44\%$
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