Review Quiz: Air Quality And Environment! Hardest Trivia

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  • 1/76 Questions

    What formula represents the ideal gas law?

    • PV=nRT
    • PVM = RTstd
    • V = TP
    • PV = MwRT
Please wait...
About This Quiz

This exam was offered as part of A&WMA's online course, "GENAQ-100E: Environmental Practices Review Specialty Course: Air Quality" in 2008.

Review Quiz: Air Quality And Environment! Hardest Trivia - Quiz

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  • 2. 

    Most household cleaning products and paints contain:

    • Metals

    • Volatile organic compounds

    • Carbon dioxide

    • Nitrogen oxides

    Correct Answer
    A. Volatile organic compounds
    Explanation
    Volatile organic compounds (VOCs) are commonly found in household cleaning products and paints. VOCs are carbon-based chemicals that easily evaporate at room temperature, releasing harmful pollutants into the air. These compounds can contribute to indoor air pollution and have been linked to various health issues such as respiratory problems, headaches, and allergic reactions. Therefore, it is important to be aware of the presence of VOCs in these products and opt for low VOC or VOC-free alternatives whenever possible.

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  • 3. 

    The inlet temperature to a baghouse needs to be above the dewpoint to prevent blinding the bags by condensing moisture in the gas. 

    • True

    • False

    Correct Answer
    A. True
    Explanation
    To prevent blinding the bags in a baghouse, the inlet temperature needs to be above the dewpoint. This is because if the temperature of the gas entering the baghouse drops below the dewpoint, moisture in the gas will condense and form droplets. These droplets can then accumulate on the bags, causing them to become clogged or blinded. By maintaining an inlet temperature above the dewpoint, the moisture in the gas remains in a gaseous state and does not condense, preventing blinding of the bags. Therefore, the statement "The inlet temperature to a baghouse needs to be above the dewpoint to prevent blinding the bags by condensing moisture in the gas" is true.

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  • 4. 

    The PM-2.5 sampling refers to:

    • Particulate greater than 2.5 microns

    • Particulate less than 2.5 microns

    • All particle matter in a stack

    • The particles collected in the back half of a sampling train

    Correct Answer
    A. Particulate less than 2.5 microns
    Explanation
    The PM-2.5 sampling refers to particulate matter that has a size smaller than 2.5 microns. This means that it includes particles that are smaller than 2.5 microns in diameter, such as fine dust, smoke, and other pollutants. These particles are small enough to be inhaled into the respiratory system and can have harmful effects on human health. Monitoring and measuring PM-2.5 levels is important for assessing air quality and understanding the potential risks associated with exposure to these fine particles.

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  • 5. 

    Most risk assessments values derived for exposure hazardous wastes and materials are given in terms of:

    • Birth defects

    • Cancer risks

    • Mutagenic effects

    • Reproduction dysfunctions

    Correct Answer
    A. Cancer risks
    Explanation
    The correct answer is cancer risks. Risk assessments for exposure to hazardous wastes and materials typically focus on evaluating the potential for developing cancer as a result of exposure. This is because certain chemicals and substances have been identified as carcinogens, meaning they have the potential to cause cancer. Assessing the risk of cancer helps determine the level of danger associated with exposure to these hazardous materials and allows for appropriate measures to be taken to minimize the risk.

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  • 6. 

    Which of the following is not a chronic health effect?

    • Genetic damage

    • Degenerative illness

    • Mercury build-up

    • Immediate exposure

    Correct Answer
    A. Immediate exposure
    Explanation
    Immediate exposure is not a chronic health effect because it refers to a single instance of exposure to a harmful substance or condition. Chronic health effects, on the other hand, develop over a long period of time and are typically associated with prolonged or repeated exposure to certain factors. Genetic damage, degenerative illness, and mercury build-up are examples of chronic health effects as they can occur over time due to ongoing exposure or accumulation of harmful substances or conditions.

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  • 7. 

    Air is a non-homogeneous mixture of gases, solid particles and liquids.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Air is considered a non-homogeneous mixture because it is composed of various gases, such as nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. Additionally, air can contain solid particles, such as dust, pollen, and pollutants, as well as liquid droplets, like water vapor. These components are not uniformly distributed throughout the air, leading to its non-homogeneous nature. Therefore, the statement that air is a non-homogeneous mixture is correct.

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  • 8. 

    The above collectors are arranged in:

    • Series

    • Parallel

    Correct Answer
    A. Series
    Explanation
    The above collectors are arranged in series. This means that the collectors are connected end to end, with the output of one collector connected to the input of the next collector. In a series arrangement, the total voltage across the collectors is equal to the sum of the individual collector voltages.

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  • 9. 

    Which type of inventory can be considered the most reliable?

    • Point source

    • Mobile source

    • Area source

    • Natural source

    Correct Answer
    A. Point source
    Explanation
    A point source of inventory can be considered the most reliable because it refers to a specific and identifiable location where emissions or releases occur. This makes it easier to monitor and control the inventory, ensuring accurate and consistent data. In contrast, mobile sources refer to emissions from vehicles that are constantly moving, making it more challenging to track and measure their emissions accurately. Area sources and natural sources are also less reliable as they represent broader areas or natural processes, which can be difficult to quantify and monitor accurately.

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  • 10. 

    Most carbon monoxide deaths are caused by faulty heating systems

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Faulty heating systems can release carbon monoxide, which is a colorless and odorless gas that can be deadly when inhaled. Carbon monoxide poisoning can occur when there is incomplete combustion of fuels such as gas, oil, or coal. Faulty heating systems can produce high levels of carbon monoxide, leading to poisoning and potentially death if not detected and addressed in a timely manner. Therefore, it is true that most carbon monoxide deaths are caused by faulty heating systems.

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  • 11. 

    Which of the following is not a common exposure route for environmental contaminants:

    • Injection

    • Inhalation

    • Ingestion of food

    • Ingestion of water

    Correct Answer
    A. Injection
    Explanation
    Injection is not a common exposure route for environmental contaminants because it refers to the introduction of substances directly into the body through a needle or syringe. This method of exposure is typically associated with medical procedures, drug use, or accidental needle sticks, rather than the typical routes of exposure to environmental contaminants. The other three options - inhalation, ingestion of food, and ingestion of water - are more common routes through which environmental contaminants can enter the body.

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  • 12. 

    In the stack sampling process, isokinetic sampling is needed when sampling for:

    • Particulates

    • NOx

    • Sulfur Oxides

    • Carbon Monoxide

    Correct Answer
    A. Particulates
    Explanation
    Isokinetic sampling is needed when sampling for particulates because it ensures that the velocity of the gas stream carrying the particulates is equal to the velocity at which the sample is collected. This is important because it helps to prevent bias in the sampling process and ensures that the collected sample is representative of the actual particulate concentration in the gas stream.

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  • 13. 

    What gas is most responsible for forming acidic precipitation?

    • SO2

    • NOx

    • CO

    • CO2

    Correct Answer
    A. SO2
    Explanation
    SO2, or sulfur dioxide, is the gas most responsible for forming acidic precipitation. When SO2 is released into the atmosphere from sources such as burning fossil fuels, it reacts with oxygen and other compounds to form sulfuric acid. This sulfuric acid then combines with water vapor in the atmosphere to form sulfuric acid droplets, which are a major component of acid rain. Acidic precipitation can have harmful effects on the environment, including damaging forests, lakes, and buildings.

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  • 14. 

    The attractive forces that hold a gas to the surface of a solid are known as:

    • Negatively charged forces

    • Van der Waals Forces

    • Positively charged forces

    • Henry's Law Force

    Correct Answer
    A. Van der Waals Forces
    Explanation
    Van der Waals forces are the attractive forces that hold a gas to the surface of a solid. These forces arise due to temporary fluctuations in electron distribution within molecules, resulting in temporary dipoles. These temporary dipoles induce opposite charges in neighboring molecules, creating attractive forces between them. Van der Waals forces are relatively weak compared to other types of chemical bonds, but they play a significant role in various phenomena, such as the condensation of gases into liquids and the adsorption of gases onto solid surfaces.

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  • 15. 

    Indoor air quality is strongly affected by:

    • Outside temperature

    • The number of air changes per hour

    • Wind speed

    • House insulation

    Correct Answer
    A. The number of air changes per hour
    Explanation
    The number of air changes per hour is a key factor that strongly affects indoor air quality. Air changes refer to the number of times the air in a space is replaced with fresh air within an hour. A higher number of air changes per hour means that there is a greater amount of fresh air entering the space, helping to remove pollutants and improve air quality. On the other hand, a lower number of air changes can lead to a buildup of pollutants and decrease indoor air quality. Therefore, it is important to have an adequate ventilation system in place to ensure a sufficient number of air changes per hour.

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  • 16. 

    The portion of the atmosphere closest to the earth is called the:

    • Stratosphere

    • Ionosphere

    • Mesosphere

    • Troposphere

    Correct Answer
    A. Troposphere
    Explanation
    The troposphere is the layer of the atmosphere closest to the Earth's surface. It extends from the surface up to about 10 kilometers (6.2 miles) in altitude. This is where weather occurs and where most of the Earth's air mass is concentrated. The troposphere is characterized by decreasing temperature with increasing altitude, and it contains the majority of the Earth's clouds and weather systems.

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  • 17. 

    Generally the higher the combustion temperature the greater amount of NOx is formed.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    This statement is true because when the combustion temperature is higher, it causes nitrogen and oxygen in the air to react and form nitrogen oxides (NOx). NOx is a harmful pollutant that contributes to air pollution and can have negative effects on human health and the environment. Therefore, it is correct to say that the higher the combustion temperature, the greater amount of NOx is formed.

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  • 18. 

    The principal commercial adsorbent used for the adsorption of organic vapors is:

    • Silica gel

    • Carbon

    • Alumina

    • Stainless steel mesh

    • Zeolite

    Correct Answer
    A. Carbon
    Explanation
    Carbon is the principal commercial adsorbent used for the adsorption of organic vapors because it has a high surface area and can effectively adsorb a wide range of organic compounds. It is a highly porous material with a large number of micropores, which provide a large surface area for adsorption. Carbon also has a high adsorption capacity and can remove organic contaminants from air or liquids. Additionally, carbon is cost-effective, readily available, and can be regenerated for reuse, making it a preferred choice for commercial adsorption applications.

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  • 19. 

    A packed countercurrent flow absorber is more efficient than a spray tower because:

    • The pressure drop increases

    • The tank diameter is usually larger

    • The tower height is increased

    • The gas-liquid interfacial area is increased

    Correct Answer
    A. The gas-liquid interfacial area is increased
    Explanation
    In a packed countercurrent flow absorber, the gas and liquid flow in opposite directions, allowing for a greater contact area between them. This increases the gas-liquid interfacial area, which enhances the mass transfer between the two phases and improves the efficiency of the absorber. The other options mentioned, such as increased pressure drop, larger tank diameter, and increased tower height, do not directly contribute to the efficiency of the absorber in the same way as increasing the gas-liquid interfacial area.

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  • 20. 

    Which of the following is not a criteria pollutant:

    • Formaldehyde

    • Carbon monoxide

    • Lead

    • Total suspended particulate

    • PM-10

    Correct Answer
    A. Formaldehyde
    Explanation
    Formaldehyde is not considered a criteria pollutant. Criteria pollutants are six common air pollutants regulated by the Environmental Protection Agency (EPA) due to their adverse effects on human health and the environment. These pollutants include carbon monoxide, lead, total suspended particulate matter, and PM-10 (particulate matter with a diameter of 10 micrometers or less). However, formaldehyde is not included in this list. While formaldehyde can be harmful at high concentrations, it is not classified as a criteria pollutant by the EPA.

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  • 21. 

    If a certified Method 9 observer reads 75% opacity, how much light transmission can be seen through the plume?

    • 10%

    • 25%

    • 50%

    • 75%

    Correct Answer
    A. 25%
    Explanation
    If a certified Method 9 observer reads 75% opacity, it means that 75% of the light is blocked or obscured by the plume. Therefore, only 25% of the light transmission can be seen through the plume.

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  • 22. 

    What is a flue gas treatement process that can be used to reduce NOx in a combustion unit:

    • Electrostatic precipitation

    • Selective catalytic reduction

    • Limestone injections

    • Carbon injections

    Correct Answer
    A. Selective catalytic reduction
    Explanation
    Selective catalytic reduction (SCR) is a flue gas treatment process that can be used to reduce NOx (nitrogen oxides) in a combustion unit. It involves the injection of a reductant, such as ammonia or urea, into the flue gas stream. The flue gas containing NOx is then passed over a catalyst, where a chemical reaction occurs between the NOx and the reductant. This reaction converts the NOx into nitrogen and water vapor, reducing the emissions of harmful pollutants. SCR is a widely used and effective method for reducing NOx emissions in industrial processes and power plants.

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  • 23. 

    What two pollutants are responsible for ozone formation in the lower atmosphere?

    • NOx

    • SO2

    • CO

    • VOC

    Correct Answer(s)
    A. NOx
    A. VOC
    Explanation
    NOx (nitrogen oxides) and VOCs (volatile organic compounds) are two pollutants that are responsible for ozone formation in the lower atmosphere. When NOx and VOCs are released into the air, they can react with sunlight to form ground-level ozone. NOx is primarily emitted from vehicles, power plants, and industrial sources, while VOCs can come from various sources such as gasoline, solvents, and certain industrial processes. These pollutants undergo a series of chemical reactions in the presence of sunlight to produce ozone, which can have harmful effects on human health and the environment.

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  • 24. 

    Particulate matter is either a solid or a liquid during standard atmospheric conditions.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Particulate matter refers to tiny particles suspended in the air, such as dust, smoke, and soot. These particles can be either solid or liquid, depending on their composition and size. Under standard atmospheric conditions, which include normal temperature and pressure levels, particulate matter can exist in both solid and liquid forms. Therefore, the statement that particulate matter is either a solid or a liquid during standard atmospheric conditions is true.

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  • 25. 

    When studying the absorption of light gases, what law is uesed to relate the amount of light absorbed to the concentration of the gas?

    • Ideal Gas Law

    • Henry's Law

    • Beer-Lambert Law

    • Avogadro Principal

    Correct Answer
    A. Beer-Lambert Law
    Explanation
    The Beer-Lambert Law is used to relate the amount of light absorbed to the concentration of the gas when studying the absorption of light gases. This law states that the absorbance of a sample is directly proportional to the concentration of the absorbing substance and the path length of the light through the sample. It is commonly used in spectroscopy to determine the concentration of a substance in a solution by measuring the absorbance of light at a specific wavelength.

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  • 26. 

    Which of the following is not a secondary pollutant:

    • Nitrates

    • Ozone

    • SO2

    • Sulfates

    Correct Answer
    A. SO2
    Explanation
    SO2 is not a secondary pollutant because it is directly emitted into the atmosphere from sources such as industrial processes and burning fossil fuels. Secondary pollutants, on the other hand, are formed in the atmosphere through chemical reactions involving primary pollutants. Nitrates, ozone, and sulfates are examples of secondary pollutants that are formed through reactions involving other pollutants like nitrogen oxides, volatile organic compounds, and sulfur dioxide.

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  • 27. 

    In the absorption process you have the transfer of a gaseous component from the gas phase to the liquid phase.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The absorption process refers to the transfer of a gaseous component from the gas phase to the liquid phase. This means that the gas is being taken in or dissolved by the liquid. Therefore, the given statement is true.

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  • 28. 

    Opacity monitors are typically:

    • In-situ monitors

    • Extractive monitors

    • Remote monitors

    Correct Answer
    A. In-situ monitors
    Explanation
    In-situ monitors are the correct answer because they are designed to measure the opacity of emissions directly at the source, without the need for sample extraction or transport. These monitors are placed directly in the stack or duct where the emissions are being released, allowing for real-time and accurate measurements. Extractive monitors, on the other hand, require the extraction of a sample from the stack and its transport to a separate location for analysis. Remote monitors are used to measure opacity from a distance, often through the use of cameras or other optical devices.

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  • 29. 

    A coal fired boiler is controlled by a spray dryer, a baghouse, and SCR.  Match the pollutant with the control device used:SOxNOxParticulate

    • Particulate - baghouse SOx - spraydryer NOx - SCR

    • Particulate - spraydryer NOx - baghouse SOx - SCR

    • NOx - SCR SOx - spraydryer Particulate - baghouse

    Correct Answer
    A. Particulate - baghouse SOx - spraydryer NOx - SCR
  • 30. 

    Which of the following inventories is not needed in conducting an ozone model?

    • Mobile sources

    • Biogenic

    • Point source

    • Toxic release inventory

    Correct Answer
    A. Toxic release inventory
    Explanation
    The toxic release inventory is not needed in conducting an ozone model because it refers to a database that tracks the release of toxic chemicals by certain industries. While this information may be relevant for other purposes, it is not directly related to the formation or behavior of ozone. The other inventories listed, such as mobile sources, biogenic, and point source, are more directly related to the factors that contribute to ozone formation and can help in modeling its behavior.

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  • 31. 

    What is the typical pH of natural rainfall?

    • 3.5

    • 5.5

    • 6.0

    • 7.5

    Correct Answer
    A. 5.5
    Explanation
    The typical pH of natural rainfall is 5.5. Rainfall is naturally slightly acidic due to the presence of carbon dioxide in the atmosphere, which forms carbonic acid when dissolved in water. This acidity can vary depending on factors such as pollution and geographical location. A pH of 5.5 indicates a slightly acidic condition, but it is still close to neutral on the pH scale.

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  • 32. 

    The smallest particle size collected at 100% efficiency in a cyclone is known as:

    • Cut size

    • Geometric size

    • Aerodynamic mean size

    • Critical size

    Correct Answer
    A. Critical size
    Explanation
    The correct answer is critical size. In a cyclone, the critical size refers to the smallest particle size that can be collected with 100% efficiency. This means that any particles smaller than the critical size will not be collected by the cyclone. The critical size is an important parameter to consider when designing and operating cyclones for particle separation and collection.

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  • 33. 

    The type of flow in a stack is defined by:

    • Avagadros Number

    • Atomic number

    • Reynolds Number

    • Bernoulli's Equation

    Correct Answer
    A. Reynolds Number
    Explanation
    The Reynolds number is used to determine the type of flow in a stack. It is a dimensionless quantity that relates the inertial forces to the viscous forces in a fluid flow. It helps to classify flow as laminar or turbulent. Laminar flow occurs at low Reynolds numbers and is characterized by smooth and orderly flow. Turbulent flow occurs at high Reynolds numbers and is characterized by chaotic and irregular flow patterns. Therefore, the Reynolds number is used to define the type of flow in a stack.

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  • 34. 

    In air pollution applications, chemical adsorption is preferable to physical adsorption.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Chemical adsorption is not preferable to physical adsorption in air pollution applications. Physical adsorption involves the physical attraction of pollutants to a solid surface, while chemical adsorption involves the formation of chemical bonds between the pollutants and the adsorbent material. In air pollution applications, physical adsorption is generally preferred because it is more reversible and allows for easier regeneration of the adsorbent material. Chemical adsorption, on the other hand, is more difficult to reverse and requires more energy-intensive processes for regeneration. Therefore, the statement is false.

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  • 35. 

    Which of the following would not be a fugitive emission?

    • Baghouse exhaust

    • Open burning

    • Road dust

    • Building vent

    Correct Answer
    A. Baghouse exhaust
    Explanation
    Baghouse exhaust would not be a fugitive emission because it is a controlled emission that is captured and collected by a baghouse system. Fugitive emissions refer to the release of pollutants into the atmosphere that are not properly controlled or contained, such as open burning, road dust, or building vents. Baghouse exhaust, on the other hand, is a controlled emission that goes through a filtration process, ensuring that the pollutants are captured and not released into the environment.

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  • 36. 

    By weight how much of the air is contained in the portion of the atmosphere closest to the earth:

    • 60%

    • 75%

    • 80%

    • 95%

    Correct Answer
    A. 95%
    Explanation
    The correct answer is 95% because the portion of the atmosphere closest to the Earth is known as the troposphere, which extends up to about 10-15 kilometers from the surface. This layer contains the majority of the air molecules and is where weather phenomena occur. Since air has weight, the percentage of air in this portion of the atmosphere can be estimated by considering the total weight of the atmosphere. The troposphere contains almost all of the atmosphere's mass, making up about 95% of its total weight.

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  • 37. 

    What are the two basic mechanisms for particulate collection in a fabric collector:

    • Diffusion and precipitation

    • Impaction and interception

    • Agglomeration and diffusion

    • Electrostatic attraction and agglomeration

    Correct Answer
    A. Impaction and interception
    Explanation
    Impaction and interception are the two basic mechanisms for particulate collection in a fabric collector. Impaction occurs when particles collide with the fabric fibers and become trapped due to their inertia. Interception, on the other hand, happens when particles are intercepted by the fabric fibers as they pass through the collector. Both mechanisms play a crucial role in capturing and removing particulate matter from the air, making them essential for effective air pollution control in fabric collectors.

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  • 38. 

    Which of the following oxidizers would be the most cost effective?

    • Thermal oxidizer

    • Regenerative thermal oxidizer

    • Catalytic oxidizer

    Correct Answer
    A. Catalytic oxidizer
    Explanation
    A catalytic oxidizer would be the most cost-effective option among the given choices. This is because a catalytic oxidizer utilizes a catalyst to promote the oxidation of pollutants at lower temperatures, resulting in reduced fuel consumption and operating costs. It offers higher energy efficiency and lower operating expenses compared to a thermal oxidizer or a regenerative thermal oxidizer, making it a more cost-effective solution for air pollution control.

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  • 39. 

    Standard particulate source testing is conducted under what EPA method?

    • Method 3

    • Method 4

    • Method 5

    • Method 25

    Correct Answer
    A. Method 5
    Explanation
    Standard particulate source testing is conducted under EPA Method 5. This method is used to determine the particulate matter emissions from stationary sources such as industrial facilities. It involves sampling the stack gas and analyzing it for particulate matter using a filter and a series of instruments. Method 5 is considered the standard method for particulate source testing and is widely recognized and accepted by regulatory agencies.

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  • 40. 

    The exhaust from a boiler has a CO concentration with a partial pressure of 19.0 mm HG.  Given a standard pressure of 760 mm HG what is the ppm of CO in exhaust? 

    • 2,500

    • 5,000

    • 25,000

    • 50,000

    Correct Answer
    A. 25,000
    Explanation
    The partial pressure of CO in the exhaust is given as 19.0 mm Hg. To find the ppm (parts per million) of CO, we need to compare this partial pressure to the standard pressure of 760 mm Hg.

    To do this, we can use the equation:

    ppm = (partial pressure of CO / standard pressure) * 1,000,000

    Substituting the given values, we get:

    ppm = (19.0 mm Hg / 760 mm Hg) * 1,000,000

    Simplifying this equation gives us:

    ppm = 25,000

    Therefore, the ppm of CO in the exhaust is 25,000.

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  • 41. 

    What is the molecular weight of air assuming there is 79% nitrogen and 21% oxygen:

    • 24.82

    • 28.84

    • 32.4

    • 39.9

    Correct Answer
    A. 28.84
    Explanation
    Air is a mixture of various gases, primarily nitrogen and oxygen. The molecular weight of a substance is the sum of the atomic weights of all the atoms in a molecule. Nitrogen has an atomic weight of 14.01 g/mol, while oxygen has an atomic weight of 16.00 g/mol. Since nitrogen makes up 79% of air and oxygen makes up 21%, we can calculate the molecular weight of air by multiplying the atomic weight of nitrogen by 0.79 and the atomic weight of oxygen by 0.21, and then adding the two values. This calculation gives us a molecular weight of approximately 28.84 g/mol, which is the correct answer.

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  • 42. 

    An inversion condition exists when you have:

    • Cool air above warm air

    • No wind

    • Cumulus clouds

    • Warm air above cool air

    Correct Answer
    A. Warm air above cool air
    Explanation
    The given answer suggests that an inversion condition exists when warm air is present above cool air. This is because in a normal atmosphere, temperature decreases with increasing altitude. However, during an inversion, a layer of warm air traps cool air beneath it, preventing it from rising. This can lead to stable atmospheric conditions with little to no vertical mixing, resulting in the absence of wind and the formation of cumulus clouds.

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  • 43. 

    Which of the following fuels would have the highest nitrogen content:

    • Natural gas

    • No. 2 oil

    • No. 6 oil

    • Coal

    Correct Answer
    A. Coal
    Explanation
    Coal would have the highest nitrogen content among the given options. Coal is a fossil fuel that is formed from the remains of plants and trees over millions of years. It contains a significant amount of nitrogen, which is released as nitrogen oxides (NOx) when coal is burned. This makes coal a major contributor to air pollution and a significant source of nitrogen emissions. Natural gas, No. 2 oil, and No. 6 oil have lower nitrogen content compared to coal.

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  • 44. 

    In the combustion process, if excess air is provided the mixture is considered to be:

    • Rich

    • Lean

    Correct Answer
    A. Lean
    Explanation
    When excess air is provided in the combustion process, it means that there is more air available than required for the complete combustion of the fuel. This results in a higher air-to-fuel ratio, leading to incomplete combustion. In such a scenario, the mixture is considered to be "lean." A lean mixture contains a higher proportion of air compared to fuel, which can result in reduced fuel efficiency and lower emissions.

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  • 45. 

    From lowest to highest list the following fuels in relationship to their sulfur content:a.  Bituminous coalb.  No. 2 fuel oilc.  No. 6 fuel oild.  Natural gase.  Antracite coal

    • B, c, d, e, a

    • D, b, c, e, a

    • B, c, d, a, e

    • D, b, c, a, e

    Correct Answer
    A. D, b, c, e, a
    Explanation
    The correct order of fuels from lowest to highest sulfur content is: d (Natural gas), b (No. 2 fuel oil), c (No. 6 fuel oil), e (Antracite coal), a (Bituminous coal).

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  • 46. 

    In a reverse air baghouse, particulate is collected on:

    • The inside of the bag

    • The exterior of the bag

    Correct Answer
    A. The inside of the bag
    Explanation
    In a reverse air baghouse, particulate is collected on the inside of the bag. This means that the bags are designed in such a way that the dirty gas flows from the outside of the bag to the inside. As the gas passes through the bag, the particulate matter is trapped on the inside surface of the bag. This method of collection allows for easier cleaning and maintenance of the baghouse system.

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  • 47. 

    During high temperature combustion what is the predominant type of NOx that is formed:

    • NO2

    • N2O5

    • NO

    • None of the above

    Correct Answer
    A. NO
    Explanation
    During high temperature combustion, the predominant type of NOx that is formed is NO. This is because the high temperature causes the nitrogen and oxygen molecules in the air to react and form nitrogen monoxide (NO) molecules. NOx refers to a group of nitrogen oxides, but in this specific scenario, NO is the most common type of NOx formed.

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  • 48. 

    An example of a high energy scrubber would be a:

    • Spray tower

    • Contact absorber

    • Venturi scrubber

    • Centrifugal scrubber

    Correct Answer
    A. Venturi scrubber
    Explanation
    A venturi scrubber is an example of a high energy scrubber because it utilizes a venturi throat to create a high velocity and turbulent gas stream. This high energy gas stream helps in the efficient mixing of the scrubbing liquid with the pollutant particles, resulting in effective particle capture and removal. The venturi scrubber is particularly suitable for applications where the pollutant particles are small and difficult to capture using other scrubbing methods.

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  • 49. 

    A condenser is not an effective way to control alcohol vapors.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    A condenser is an effective way to control alcohol vapors. A condenser is a device that cools down and condenses vapors into a liquid form. In the context of controlling alcohol vapors, a condenser can be used to capture and collect the alcohol vapors, preventing them from escaping into the environment. This is commonly used in distillation processes, where alcohol vapors are condensed and collected to produce alcoholic beverages or other products. Therefore, the statement "A condenser is not an effective way to control alcohol vapors" is false.

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  • Oct 24, 2024
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  • Sep 17, 2009
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