Week 10 Assignment 10 (L46–L50) — Air Pollution and Control

• The width of the ESP plate.

• The volumetric gas flow rate.

• The viscosity of the gas.

• The drift velocity (or migration velocity) of the particles.

The acceptable threshold level of air pollution in terms of its potential impacts on health and environment, which is adopted and enforced by a regulatory body or authority, is defined as the:

• Emission Standard

• Hazard Identification Level

• Ambient air quality standard

• Exposure Characterization limit

In India, the first ambient air quality standards were adopted by the Central Pollution Control Board (CPCB) in 1982, following the passage of which legislative act by Parliament in 1981?

• The Motor Vehicles Act

• The Water (Prevention and Control of Pollution) Act

• The Air (Prevention and Control of Pollution) Act

• The Environmental Protection Act

In the context of the Gujarat Smoke Nuisance Act, 1963, what device or method is explicitly mentioned as being used for determining whether smoke emissions are within permissible limits by comparing the smoke's darkness with standard shades of grey?

• A Catalytic Converter

• A High-Volume Sampler

• The Deutch-Anderson equation

• The Ringelmann chart

Under the National Air Quality Monitoring Programme (NAMP), the Central Pollution Control Board (CPCB) regularly monitored which three air pollutants at all monitoring locations?

• Ozone (O3), Carbon Monoxide (CO), and PM2.5

• Lead, Benzene, and Ammonia

• Sulphur Dioxide (SO2), Nitrogen Dioxide (NO2), and Particulate Matter (size ≤ 10 µm)

• Volatile Organic Compounds (VOC), SO2, and PM10

According to the Vehicle Scrappage Policy 2021, what are the respective age limits after which commercial vehicles and passenger vehicles must be mandatorily scrapped?

• Commercial vehicles >10 years, Passenger vehicles >15 years.

• Both commercial and passenger vehicles >20 years.

• Commercial vehicles >15 years, Passenger vehicles >20 years.

• Commercial vehicles >20 years, Passenger vehicles >15 years.

A cyclone has an inlet width of 20 cm and five effective turns (N = 5). The gas temperature is 350 K, and the inlet velocity is 12 m/s. The average particle density is 1.5 g/cm3. What is the cut diameter (particle size collected with 50% efficiency)? The viscosity of air at 350 K is 0.0748 kg/m-h.

• 5.75 µm

• 8.13 µm

• 10.33 µm

• 12.14 µm

A regenerative carbon bed system has three beds in parallel, each having: gas flow rate of 8,500 SCFM (Standard Cubic Feet per Minute); gas temperature of 110°F; gas pressure of +5 inches W.C. (Water Column); and barometric pressure of 31.5 inches Mercury (Hg). What is the minimum cross-sectional area of each bed if the gas velocity must be maintained below 120 feet per minute?

• 45.5 ft²

• 54.8 ft²

• 71.8 ft²

• 93.4 ft²

An electrostatic precipitator, in which the collection plate area is 120 m², collection efficiency is 99.94%, and the migration velocity is 0.25 m/s, will have the gas flow rate

• 1.5 m³/s

• 4 m³/s

• 6.7 m³/s

• 13 m³/s

What is the maximum toluene removal efficiency possible in a refrigeration-type condenser operating at −100°F if the inlet concentration is 8,000 ppm? Given the outlet partial pressure at −100°F for toluene is 0.015 mm Hg.

• 85%

• 90.5%

• 95.1%

• 99.7%