Subtopic: Calculation of performance parameters – field capacity, efficiency, performance index, application rate and losses
Question Statement:
Field Machine Index ($FMI$) is defined as the ratio of uninterrupted row operating time ($t_o$) to the sum of operating time and headland turning time ($t_t$). In plowing a rectangular field, the net row operating time is $t_o = 4.2\text{ h}$ and headland turning time is $t_t = 0.8\text{ h}$. If $FMI = \frac{t_o}{t_o + t_t} \times 100$, the value of $FMI$ in percentage is ________ (answer in integer).
Answer Key:
84
Step-by-Step Solution & Explanation
Field Machine Index ($FMI$):
$FMI = \frac{t_o}{t_o + t_t} \times 100$
Given $t_o = 4.2\text{ h}$ and $t_t = 0.8\text{ h}$:
$FMI = \frac{4.2}{4.2 + 0.8} \times 100 = \frac{4.2}{5.0} \times 100 = 84\%$