Test: Environmental Engineering- 6 - Civil Engineering (CE) MCQ

It is a condition where exists a strong super-adiabatic lapse rate above surface inversion.

Lofting plume has minimum downward mixing due to presence of inversion and is considered as ideal case for dispersion of emission.

Ambient air quality standards in respect of Noise as per Noise Pollution (Regulation and Control) Rules, 2000, of the Ministry of Environment & Forests, India are tabulated below:

The Particulate Control Devices description are as follow:

Hence, Fabric Filtration can collect small particles as one micrometre and can also have an efficiency as high as 99% or more.

Sulphur dioxide carbon monoxide, nitrogen oxides, lead, hydrocarbons, allergic agents like pollens and spores and radioactive substances are primary pollutants. Sulphuric acid, ozone, formaldehydes & peroxyacylnitrates (PAN) are secondary pollutants.

Dry air cools at the rate of 9.8°C per km and it is called dry adiabatic lapse rate. In saturated (wet) air, this rate is calculated to be 6°C per km and is known as wet adiabatic lapse rate.

Resulting temperature of air
= 40 − 9.8 × 500/1000 = 40 − 4.9 = 35.1^∘C

The Layers of atmosphere in order of increasing heights form the surge of earth

a) Troposphere_____ 0 to 11 km _____ 15 to -56°C

b) Stratosphere _____ 11 to 50 km _____ 15 to 0.2°C

c) Mesosphere _____ 50 to 85 km _____ -02° to -92°C

d) Thermosphere _____ 85 to 500 km _____ -92° to 1200°C

Let X be the concentration of particles in flue gas.

∴ Particles remained after ESP₁ = (1-0.8) X = 0.2 X

Particles remained after ESP₂ = (1-0.65) 0.2 X = 0.07 X

NO_x emitted by 200,000 vehicles

= 2.5 × 200,000

= 500,000 g/km

NO_x produced by 200,000 vehicles for a distance of 50000 km

= 500,000 × 50000 × 10^-6 tonnes

= 25000 tonnes.

Molecular weight, M = 12 + 1 + 3 × 35.5 = 119.5

The average sound pressure level at that location is: