Discussion
Electrostatic precipitators work on the principle of :
Answer: C
Electrostatic precipitators work on the principle of charge separation.
In an electrostatic precipitator the dust-laden gas passes between discharge electrodes held at a high negative voltage and earthed collecting plates. The corona discharge charges the particles, which are then attracted to and held on the collecting plates, from which they are rapped off into hoppers. Removal efficiencies above 99 per cent are achieved for fine fly ash from power plants.
Gravity settling chambers and cyclones (centrifugal separation) are different devices that work on other principles, so 'all of the above' is wrong.
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