ANS:B - electrostatic precipitator.

Corona discharge is related to the operation of an electrostatic precipitator. An electrostatic precipitator is a device used to remove particulate matter such as dust and ash from industrial exhaust gases. It works by applying an electric field to ionize particles within the gas stream, causing them to become electrically charged. These charged particles are then attracted to oppositely charged plates within the precipitator, where they are collected and removed from the gas stream. Corona discharge occurs within the electrostatic precipitator when the electric field becomes strong enough to ionize the gas surrounding the electrodes, creating a luminous discharge or glow. This corona discharge plays a crucial role in the ionization of particles within the gas stream, enhancing the efficiency of particle removal in the electrostatic precipitator. Therefore, corona discharge is closely associated with the operation of electrostatic precipitators.