Chemical Environmental Engineering

A. Bacterial stability factor
B. Relative stability
C. Biological oxygen demand (BOD)
D. Oxygen ion concentration

A. t = 15 – 0.0065h
B. t = 15 + 0.0065h
C. t = 0.0035h -15
D. t = 15 – 0.0035h

A. Hydrocarbons
B. NOx
C. SO2
D. CO

A. Diameter
B. Inlet gas velocity
C. Overall height
D. All A., B. & C.

A. Pipe vibrations
B. Cavitation
C. Boundary layer separation
D. Fluctuation in liquid flow

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

A. CO, CO2 & SO2
B. H2S, NO & SO3
C. CO2, H2S & NO2
D. SO3, NO2 & CO2

A. Oxidation
B. Imhoff tank
C. Lagoon
D. Skimming tank

A. Biological oxygen pond
B. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
C. Lagoons
D. Filtration

A. Bronchitis
B. Silicosis
C. Pneumoconiosis
D. None of these