Question

Which device separates dust particles from gas by centrifugal force?

• A. Scrubber
• B. Electrostatic precipitator
• C. Cyclone separator
• D. Bag filter

Hint:

Logic Tip: The word "Cyclone" implies a spinning vortex, like a tornado. Centrifugal force is the outward force generated by things spinning in a circle. Therefore, the spinning cyclone is the device that uses centrifugal force.

Answer 1

The Correct Option is C

Concept:
Industrial gas-solid separation equipment relies on different physical mechanisms (filtration, electrical charge, liquid washing, or inertia) to remove particulate matter from exhaust gases.

Step 1: A wet scrubber uses a fine mist of liquid (usually water) to physically collide with and wash the dust particles out of the gas stream.

Step 2: An ESP applies a high-voltage electrical charge to the dust particles and then collects them on oppositely charged metal plates using electrostatic attraction.

Step 3: A baghouse physically filters the gas by forcing it through tightly woven fabric bags, trapping the dust purely through mechanical blockage (like a vacuum cleaner).

Step 4: A cyclone forces the dirty gas to spin rapidly in a vortex inside a conical chamber. Because the solid dust particles are heavier than the gas, their inertia (specifically centrifugal force) flings them outward against the chamber walls, where they lose momentum and slide down into a hopper.