Posted inQuiz Quiz: Gaseous Pollutants Control Techniques Posted by kanwar August 4, 2024No Comments 46 Gaseous Pollutants Control Techniques 1 / 15 1. In a regenerative thermal oxidizer, the heat exchange media (ceramic beds) serve to: A. Reduce the formation of NOx. B. Pre-heat the incoming exhaust gas and recover heat from the outgoing clean gas. C. Catalyze the oxidation reactions. D. Increase the combustion temperature. 2 / 15 2. In a packed tower wet scrubber, the packing material serves primarily to: A. Increase the contact surface area between gas and liquid. B. Reduce the pressure drop across the scrubber. C. Increase the gas flow velocity. D. Enhance the chemical reaction rate. 3 / 15 3. In a dry scrubber system, the sorbent material typically reacts with the pollutant gas to form: A. A gaseous byproduct. B. A liquid effluent. C. A colloidal suspension. D. A solid precipitate. 4 / 15 4. Which of the following is a major advantage of using a catalytic oxidizer over a direct flame oxidizer? A. Higher destruction efficiency for a wider range of pollutants. B. No need for additional fuel to sustain combustion. C. Ability to handle high concentrations of particulate matter. D. Lower operating temperatures, leading to reduced energy consumption and NOx formation. 5 / 15 5. Which type of thermal oxidizer offers the highest energy efficiency due to its heat recovery mechanism? A. Regenerative oxidizer B. Direct flame oxidizer C. Catalytic oxidizer D. Recuperative oxidizer 6 / 15 6. The adsorption process in an adsorber is influenced by several factors. Which of these is LEAST likely to impact adsorption efficiency? A. Temperature B. Adsorber vessel material C. Humidity D. Pollutant concentration 7 / 15 7. Which of the following absorption mechanisms in a wet scrubber is MOST effective for removing highly soluble gases like ammonia (NH3)? A. Chemical reaction with an acidic solution B. Condensation C. Physical absorption D. Adsorption onto the liquid surface 8 / 15 8. Which of the following is a common challenge in the operation of wet scrubbers? A. High energy consumption B. Difficulty in handling dry waste products C. Limited removal efficiency for particulate matter D. Scaling and fouling due to dissolved solids in the scrubbing liquid 9 / 15 9. Which adsorbent material is known for its high capacity for removing a wide range of volatile organic compounds (VOCs)? A. Silica gel B. Activated carbon C. Limestone D. Zeolites 10 / 15 10. In a catalytic oxidizer, the catalyst primarily functions to: A. Increase the combustion temperature. B. Reduce the formation of NOx. C. Increase the residence time of pollutants in the system. D. Lower the activation energy for oxidation reactions. 11 / 15 11. The selection of the appropriate gaseous pollutant control device depends on various factors, including: A. The desired removal efficiency. B. All of the above. C. The exhaust gas flow rate and temperature. D. The type and concentration of pollutants. 12 / 15 12. Which type of scrubber is MOST suitable for removing both particulate matter and acid gases from industrial exhaust streams? A. Dry scrubber B. Adsorber C. Thermal oxidizer D. Wet scrubber 13 / 15 13. A venturi scrubber achieves high collection efficiency for fine particulate matter primarily due to: A. Its low pressure drop. B. Its large cross-sectional area. C. High gas velocity and turbulence creating fine liquid droplets D. The use of a packed bed 14 / 15 14. In a thermal oxidizer, the “destruction efficiency” refers to: A. The amount of heat recovered from the process. B. The percentage of pollutant removed from the exhaust gas. C. The ratio of pollutant inlet concentration to outlet concentration. D. The efficiency of fuel combustion. 15 / 15 15. The “breakthrough point” in an adsorber refers to: A. The point at which the adsorbent bed starts to regenerate. B. The point at which the temperature in the adsorber reaches its maximum limit. C. The point at which the adsorbent is fully saturated and can no longer adsorb pollutants. D. The point at which the pollutant concentration in the outlet gas exceeds a predetermined limit. The average score is 54% LinkedIn Facebook VKontakte 0% Restart quiz Send feedback Author kanwar Kanwar Bhan Godara UGC NET JRF Environmental Science View all posts kanwar Kanwar Bhan Godara UGC NET JRF Environmental Science View All Posts Post navigation Previous Post The Green Clean: Bioremediation for a Sustainable TomorrowNext Post17: Nature’s Secret Code for a Greener Future