Question

The diagram below shows electrostatic precipitators. Identify 1, 2 and 3.

• A. 1 - Discharge corona, 2 - Negatively charged wire, 3 - Collection plate grounded
• B. 1 - Discharge corona, 2 - Positively charged wire, 3 - Collection plate grounded
• C. 1 - Discharge corona, 2 - Negatively charged wire, 3 - Collection plate burnt
• D. 1 - Uncharge corona, 2 - Positively charged wire, 3 - Collection plate never grounded

Answer 1

The correct option is A 1 - Discharge corona, 2 - Negatively charged wire, 3 - Collection plate grounded

Electrostatic precipitators (ESPs) are the devices which remove the particulate material present in air as pollutants; they use electrical force to move particles from the air stream to the collection plates. Particles passing via a precipitator are given a negative charge by being forced to pass through a region called a corona. Once the negatively charged particle passes, it is forced to attach to the positively charged plate. Particles are removed from the plate by a knocking action.