Step 1: Concept A rubber roll sheller is a modern husking machine that uses two rubber rollers rotating at different speeds to remove the husk from paddy.
Step 2: Meaning The "shelling percentage" refers to the efficiency of the machine in removing the husk from the total volume of paddy passed through it in a single pass.
Step 3: Analysis Due to the precise shearing action of the rubber rollers, these machines are highly efficient compared to older stone disk shellers. They typically achieve a high husking percentage while minimizing grain breakage.
Step 4: Conclusion Under optimal conditions, a rubber roll sheller can effectively shell between 90% and 95% of the paddy fed to it.
Final Answer: (A)