Question

Which of the following devices used for filtering polluted air?

• A. Electrostatic precipitators
• B. Electrically charged plates
• C. Scrubbers
• D. Electrodynamic precipitators

Answer 1

Answer: (A), (C)

The correct options are
A

Electrostatic precipitators

C

Scrubbers

Scrubbers are devices that remove gaseous and particulate air pollutants. In these, the air is passed through dry or wet packing material. The air passing out of the scrubber is dust-free and clean, as well as free from certain gaseous pollutants which get dissolved in wet packing.
The electrostatic precipitator is a device that removes suspended dust particles from a gas or exhaust by applying a high-voltage electrostatic charge and collecting the particles on charged plates.