Cottrell precipitator is a device to coagulate the

Options

A. dirt particles of sewage water
B. mud or clay particles from drinking water
C. solid particles of carbon from smoke
D. colloidal particles of any sol.

Answer

C

Explanation

Smoke, a dispersion of negatively charged colloidal particles by passing it through Cottrell smoke precipitator installed in the chimney of an industrial plant. It consists of two metal discs charged to a high potential `(30,00-50,000 "volts")` .
The carbon particles get discharged and precipitate while gases come out form the chimney.