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Chemical Environmental Engineering

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?

Chemical Environmental Engineering /
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?

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

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________? Read More »

Chemical Environmental Engineering

In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ?

Chemical Environmental Engineering /
In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ?

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

In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ? Read More »

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_________________?

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.

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_________________? Read More »

Chemical Environmental Engineering

Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?

Chemical Environmental Engineering /
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?

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

Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________? Read More »

Chemical Environmental Engineering