Determine the correct statement from the given option with respect to an electrostatic precipitator.

Moderate

A

The velocity of air is very fast so that a large volume of air can be purified at a time.
B

The electrode wires maintained at several thousand volts produces a corona which releases positively charged particles.
C

Air is passed through a spray of water and lime.
D

Collecting plates are grounded and collect negatively charged dust particles.

Solution

In electrostatic precipitators;
The collecting plates are grounded and attract the charged dust particles.
It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons (negatively charged).
The velocity of air between the plates must be low enough to allow the dust to fall.
Air is passed through a spray of lime water in scrubbers.

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