Question Bank • QB_FM_ADV_032 MCQ • 1 Mark

Section 2: Farm Machinery

Farm Machinery

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

Question Statement:

According to ISO 7256/1 and ASABE standards for evaluating precision planters, the 'Multiple Index' is defined as the percentage of seed spacings that are:

Options:

  • (A) Greater than $1.5$ times the theoretical set seed spacing
  • (B) Less than or equal to $0.5$ times the theoretical set seed spacing
  • (C) Between $0.5$ and $1.5$ times the theoretical set seed spacing
  • (D) Exactly equal to the theoretical set seed spacing

Answer Key:

B

Step-by-Step Solution & Explanation

In planter performance indices (Kachman and Smith / ASABE Standard S506): - **Multiple Index ($I_{\text{mult}}$):** Spacings $\le 0.5$ times the theoretical set spacing ($x_{\text{ref}}$), representing double/triple seed drops. - **Miss Index ($I_{\text{miss}}$):** Spacings
gt; 1.5$ times the theoretical spacing, representing empty cells/skips. - **Quality of Feed Index ($I_{\text{qfi}}$):** Spacings between $0.5\,x_{\text{ref}}$ and $1.5\,x_{\text{ref}}$, representing accurate single-seed placements.
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