Allied & ICAR Exam Bank • ALLIED_1291 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Size Reduction and Milling

Subtopic: Rice Polishing and Whitening

Question Statement:

In a modern rice milling train, brown rice from the dehusker is converted to white rice in abrasive whiteners through:

Options:

  • (A) High-speed carborundum abrasive grinding stones stripping bran layers from the endosperm
  • (B) Chemical bleaching with chlorine dioxide
  • (C) Subcritical steam stripping
  • (D) Water washing under pressure

Answer Key:

A

Step-by-Step Solution & Explanation

Abrasive whitening machines rotate emery or carborundum stone rollers inside a slotted screen cage to scour bran layers off brown rice grains by friction and abrasion.
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