Question

Indented cylinder separator separates the grains on the basis of -----------.

• A. Weight
• B. Size
• C. Surface texture
• D. Length

Hint:

Remember:
- Screen cleaners separate by Width or Thickness.
- Indented cylinders separate by Length (ideal for separating broken grain from whole grain).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Post-harvest cleaning and grading equipment separates weed seeds, broken grains, and foreign matter from intact grains based on physical properties like size, shape, density, or length.

Step 2: Detailed Explanation:
1. An indented cylinder separator (or disc separator) consists of a rotating horizontal cylinder with pocket-like indents pressed into its inner wall.
2. As grains flow through the rotating cylinder, shorter grains (or broken kernels) fit completely inside these indents and are lifted higher by the cylinder's rotation.
3. These lifted grains fall into a central collecting trough.
4. Longer, intact grains do not fit into the indents, sliding back down the cylinder to be discharged from the end.
5. This mechanism separates particles specifically by their length.

Step 3: Final Answer:
An indented cylinder separator separates grains based on their length.