Category: Chemical Environmental Engineering

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?

A. With greater number of blades
B. Of increased diameter
C. Both A. & B.
D. Neither A. nor B.

A. Food industry
B. Municipal sewage treatment
C. Petroleum refinery
D. Iron & steel plant