Subtopic: Calculation of power, torque, fuel consumption, heat load and power losses
Question Statement:
If the Reel Speed Index of a grain combine is more than 1.5, it will increase
Options:
(A) Cutter bar loss
(B) Shatter loss
(C) Cylinder loss
(D) Straw walker loss
Official Answer Key:
B
Step-by-Step Solution & Explanation
• Reel Speed Index (RSI) = peripheral speed of reel / forward speed of the combine.
• An RSI close to 1.0–1.5 gently strips the crop into the cutter bar. When RSI exceeds about 1.5, the reel bats strike the crop head too fast relative to machine travel, knocking grain out of the head before it is cut and gathered.
• This mechanical over-striking of the standing crop is the direct cause of increased shatter (pre-harvest) loss at the header, distinct from cylinder loss (threshing) or straw-walker loss (separation), which occur further downstream in the machine.
• Final Answer: (B) Shatter loss
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