Question

Separation equipment suitable for separating air borne particles of a rice mill is:

• A. Gravity separator
• B. Hydroclone
• C. Cyclone separator
• D. Bran separator

Hint:

Cyclone separator = Centrifugal gas-solid separation (dust/chaff/husk).
Hydrocyclone = Centrifugal liquid-solid separation.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Gas-solid separation in dust collection and pneumatic conveying lines relies on centrifugal force to disengage solid particles from a swirling gas stream.
Key Formula or Approach:
\[ F_c = \frac{m v_t^2}{r} \gg F_g \]

Step 2: Detailed Explanation:
In modern rice milling facilities, pneumatic suction lines convey husk, bran dust, and fine chaff particles away from polishers and dehuskers.
A cyclone separator introduces this dust-laden air tangentially into a conical chamber, creating a high-velocity vortex.
Centrifugal force hurls the denser airborne particles against the outer cyclone wall, where they lose velocity and slide down to the bottom rotary discharge airlock, while clean air exits through the top vortex finder pipe.

Step 3: Final Answer:
Thus, the equipment suitable for separating airborne particles is Cyclone separator, corresponding to option (C).