Question

Specific gravity separator separates materials based on

• A. Texture
• B. Length
• C. Size
• D. Density

Hint:

Separation principles:
Sieve/Screen $\rightarrow$ Size Width
Indented cylinder $\rightarrow$ Length
Gravity separator $\rightarrow$ Density/Specific gravity
Spiral separator $\rightarrow$ Shape/Roundness.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Specific gravity separators (gravity tables) utilize a combination of fluidization by upward air flow and eccentric deck oscillation to stratify particles according to density.

Step 2: Detailed Explanation:
In seed processing plants, a specific gravity separator operates on the principle of differences in density (specific gravity) between particles of nearly identical size and shape.
Air forced through a porous oscillating deck floats lighter, insect-damaged, unfilled, or immature seeds down to the lower discharge edge, while heavier, high-density seeds remain in contact with the deck and travel to the high discharge side.

Step 3: Final Answer:
Hence, a specific gravity separator separates materials based on Density, matching option (D).