Question

In electrostatic precipitator, the released electrons attach
to the

• A. Negatively charged wire
• B. Corona
• C. Dust particles giving them a net negative charge
• D. Collection plates that are grounded

Answer 1

The correct option is C Dust particles giving them a net negative charge

Working of electrostatic precipitator
The electrostatic precipitator works on the principle of electric charging of dust particles and collecting them on a differently charged platform.
The working of the precipitator can be described in the following steps:-

• Electrostatic precipitators are composed of two electrodes maintained at several thousand volts.
• These electrodes produce a corona of negative charges.
• The released electrons get attached to the particulate matter passing through the precipitator.
• The suspended particles after being exposed to the corona get negatively charged and are attracted to the collecting plate grounded in the earth.
• These electrodes are removed and cleaned at regular intervals to collect the soot and ash.

Therefore, it is most widely used to remove over 99% of particulate matter present in the exhaust of a thermal power plant.