Environmental Engineering in CE
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

Hydrocarbon fuel
Pulverised coal as fuel
Large quantity of excess combustion air
Low amount of excess combustion air

ANSWER DOWNLOAD EXAMIANS APP

Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate
All of these
Coagulation and flocculation of colloids
Oxidation of carbonaceous matter to CO₂

ANSWER DOWNLOAD EXAMIANS APP