Question

Which of the following air pollution control devices is suitable for removing the finest dust from air?
A)Cyclone separator
B)Electrostatic precipitator
C)Fabric filter
D)Wet scrubber

Answer 1

Air pollution is the presence in the atmosphere of substances that are harmful to human and other human health or cause damage to the climate or materials. There are different types of air pollutants, such as gases, particulate matter and biological molecules.

Complete answer:
Air pollution is the presence in the atmosphere of substances that are harmful to human and other human health or cause damage to the climate or materials. There are different types of air pollutants, such as gases, particulate matter and biological molecules.

Complete Answer:
Air pollution control devices are a series of devices designed to prevent a variety of pollutants, both gaseous and solid, from entering the atmosphere mainly from industrial smoke stacks. These control devices can be divided into two broad categories-devices that control the amount of particulate matter leaking into the environment and devices that control the emission of acid gases.

Although complex, these devices have been shown to be effective in the past, with the overall emission levels for many pollutants declining with the implementation of these control devices.

Specific machines are used to remove particulate matter from flue gases. Much of this separation uses physical separation means, not chemical separation techniques, simply because the particulate matter is large enough to be caught in this way.

Electrostatic Precipitator:	Electrostatic precipitator is a type of filter that uses static electricity to remove soot and ash from exhaust fumes before the smoke stacks are removed. Unburned carbon particles in smoke are removed from the smoke by using static electricity in the precipitators, leaving clean, hot air to escape the smoke stacks.It is vital to remove this unreacted carbon from the smoke, since it can damage buildings and harm human health-especially respiratory health.
Cyclone Separator:	A cyclone separator is a separation device that uses the principle of inertia to remove particulate matter from flue gas. In these separators, dirty flue gas enters a chamber with a vortex, similar to a tornado. Due to the difference in inertia between the gas particles and the larger particles, the gas particles move up the cylinder while the larger particles hit the inside wall and drop down.This separates the particulate matter from the flue gas, leaving the flue gas clean.
Fabric Filter:	Fabric filters are a fairly simple method that can be used to remove dust from flue gases. In some gases, acidic gasses can also be removed if basic compounds are used. This method simply uses some kind of fabric-usually felt is used as a woven cloth that would allow the dust to pass through-so that the flute glasses must pass through it before the smoke stacks are out.
Scrubbers	Scrubbers are a type of system used to remove harmful materials from industrial exhaust gasses before they are released into the environment. These pollutants are generally gaseous, and when scrubbers are used to specifically remove SOx, they are referred to as flue gas desulfurization. There are two main types of scrubber, wet scrubbers and dry scrubbers.The main difference is the type of material used to remove the gases. By removing acid gasses from the exhaust system before they are released into the sky, scrubbers help prevent acid rain from forming.

Hence, the correct answer is option (B)

Note: The main goal of control equipment is

1. To reduce the release of harmful gases, and to control the spread of air and water pollution
2. To conserve any natural resources available to our future generations;
3. to reduce the health hazards posed by breathing in and otherwise consuming pollution
   4)Filtration technology is used at home to remove household contaminants such as pet dander, allergens, mold spores and dust from air conditioners. Precision filtration systems reduce emissions from engines, exhaust pipes and air conditioning systems in vehicles.