Subtopic: Calculation of performance parameters – field capacity, efficiency, performance index, application rate and losses
Question Statement:
Which of the following factors directly affect the field efficiency ($\eta$) of a tractor-operated field implement?
Options:
(A) Shape and geometry of the agricultural field (length-to-width ratio)
(B) Time lost during turning at headlands
(C) Theoretical operating width of the implement
(D) Time lost for clearing clogs, seed hopper refilling, and operator adjustments
Answer Key:
A, B, D
Step-by-Step Solution & Explanation
1. Field efficiency is the ratio of effective field capacity to theoretical field capacity: $\eta = \frac{EFC}{TFC}$.
2. Time lost during turns at headlands directly reduces effective working time, governed by field shape and run length (longer rows yield higher efficiency). (Statements A and B are True)
3. Time lost for maintenance, adjustments, refilling seed/fertilizer, and clearing clogs directly reduces field efficiency. (Statement D is True)
4. Theoretical operating width $W$ defines theoretical field capacity ($TFC = W \times v / 10$), not the percentage time losses ($\%$) that constitute field efficiency.