First slide

Air Pollution and its Control

Question

Select the correct statement w.r.t electrostatic precipitator.

Moderate

A

The velocity of air between the collecting plates must be high
B

The collecting plates attract the negatively charged dust particles
C

It can remove the gases like sulphur dioxide from the exhaust
D

The collecting plates attract the positively charged dust particles

Solution

Electric precipitator has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons. These electrons attach to dust particles giving them a net negative charge. The collecting plates are grounded and attract the charged dust particles. The velocity of air between the plates must be low enough to allow the dust to fall.

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