• Harvesting Machine Grain Losses:
• In combine harvesters and mechanical threshers, losses are categorized by the functional component responsible:
• Rack Loss (Straw Walker Loss): Threshed, loose grain that fails to separate through the straw walker grates and is carried out over the rear of the machine along with the ejected straw.
• Shoe Loss (Cleaning Shoe Loss): Separated grain that is blown or shaken out over the cleaning sieves/chaffer into the chaff discharge by the cleaning fan blast.
• Cylinder Loss (Threshing Loss): Unthreshed grain heads/pods passing through the threshing cylinder into the straw.
• Header Loss: Grain shattered or cut stems lost at the cutterbar before entering the feeder conveyor.
• Conclusion: Threshed grains passing out in straw is Rack loss (Option 3).

Correct option: (3) Rack loss