Untitled Quiz

Air pollution is defined as the presence of one or more contaminants in the air in such quantities and for such durations which may be or tend to be injurious to human, animal or plant life, or property, or which unreasonably interferes with the comfortable usage of air.

The main cause of air pollution is combustion.

<p>A pollutant emitted directly from a source</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>Gravitational settling chambers, Cyclone separators, Fabric filters, Electrostatic precipitator</p> Signup and view all the answers

<p>Wet gas scrubbing</p> Signup and view all the answers

<p>Electrostatic precipitator</p> Signup and view all the answers

<p>High initial cost</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>The threefold purpose of controlling emissions from industrial sources is the recovery of the valuable materials for economic benefit, the removal of abrasive dusts to reduce wear on fan components, and the removal of undesirable substances from gases before they are discharged into the atmosphere.</p> Signup and view all the answers

<p>Ionization or corona generation, Charging of particles, Migration and precipitation of particles, Removal of deposited dust</p> Signup and view all the answers

<p>The two types of corona discharge are negative corona and positive corona.</p> Signup and view all the answers

<p>The common use of negative corona in industrial applications is due to its effectiveness in capturing and removing particulates. However, the production of ozone in negative corona makes it unsuitable for air cleaning in inhabited spaces. In inhabited spaces, positive corona is used because it does not produce ozone.</p> Signup and view all the answers

<p>The process of removing collected particles from the collecting surface is called rapping or shaking.</p> Signup and view all the answers

<p>Cone-Wire Precipitator</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>The three common types of baghouses based on their cleaning method are reverse-air, shaker and pulse-jet.</p> Signup and view all the answers

<p>Provide structural support</p> Signup and view all the answers

<p>Physical Adsorption</p> Signup and view all the answers

<p>Chemical adsorption is frequently used in situations that require a strong binding between the contaminant and the solid surface, such as for the control of acid gases and mercury vapor.</p> Signup and view all the answers

<p>The key difference between physical and chemical adsorption lies in the manner in which the gas molecule is bonded to the adsorbent. In physical adsorption, weak intermolecular forces are responsible for the bonding, while in chemical adsorption, a chemical reaction occurs, resulting in a stronger bond.</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>Surface Area</p> Signup and view all the answers

<p>The primary method for regenerating an adsorbent bed is thermal swing, where the bed is heated to reduce the adsorption capacity, and then cooled for subsequent use.</p> Signup and view all the answers

<p>The four main categories of adsorbent regeneration are thermal swing, pressure swing, inert purge gas stripping and displacement cycles.</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>The four key factors to consider in the design of an absorption tower are providing a large interfacial contact area, ensuring good mixing between gas and liquid phases, allowing sufficient residence time for the phases, and ensuring a high degree of solubility of the contaminant in the absorbent.</p> Signup and view all the answers

<p>Cyclone tower</p> Signup and view all the answers

<p>The three steps involved in the absorption process are: diffusion of the pollutant from the bulk gas phase to the gas-liquid interface, transfer of the gaseous pollutant across the interface to the liquid phase, and diffusion of the pollutant in the bulk area of the liquid.</p> Signup and view all the answers

<p>Cyclone separators are designed to use centrifugal forces to separate particles.</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>False</p> Signup and view all the answers

<p>The collection efficiency of a cyclone is primarily determined by the centrifugal force, directly affected by factors such as the gas velocity and the size of the cyclone.</p> Signup and view all the answers

<p>$Fc = (mv^2)/r $</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>The key design parameters in a bag house are pressure drop and air-to-cloth ratio.</p> Signup and view all the answers