Water supply and environmental engineering 1. What is the minimum velocity required to prevent the deposition of solids in a sewer pipe with a diameter of 750 mm? 0.6 m/s 0.3 m/s 0.9 m/s 1.2 m/s 2. What is the main purpose of a water treatment plant? To remove contaminants from water to make it safe for drinking and other uses. To generate electricity To produce heat To treat wastewater 3. What is the concept of life cycle assessment (LCA) used for in environmental engineering? LCA is a tool used to assess the environmental impacts of a product or service throughout its entire life cycle, from raw material extraction to disposal. LCA is used to identify the most environmentally friendly product or service. LCA is used to reduce the cost of a product or service. LCA is used to improve the quality of a product or service. 4. What is the removal efficiency of a primary settling tank for suspended solids, if the influent concentration of suspended solids is 250 mg/L and the effluent concentration of suspended solids is 100 mg/L? 60% 40% 80% 90% 5. What is the difference between coagulation and flocculation? Coagulation is the process of destabilizing colloidal particles in water, while flocculation is the process of aggregating destabilized colloidal particles into larger flocs. Coagulation is a physical process, while flocculation is a chemical process. Coagulation is a continuous process, while flocculation is a batch process. Coagulation is a reversible process, while flocculation is an irreversible process. 6. What is the minimum water pressure required for a domestic water supply system? 15 psi 10 psi 20 psi 25 psi 7. What is the main goal of air pollution management? To reduce the concentration of air pollutants in the atmosphere to levels that are safe for human health and the environment. To increase the efficiency of air pollution control devices. To reduce the cost of air pollution control To improve the aesthetics of air pollution control. 8. What is the main purpose of conducting an EIA for a new road construction project? To identify and assess the potential environmental impacts of the project, and to develop mitigation measures to minimize these impacts. To reduce the cost of the project. To increase the speed of the project. To improve the quality of the project. 9. What is the main difference between a point source and a non-point source of pollution? A point source of pollution is a single, identifiable source of pollution, while a non-point source of pollution is a diffuse source of pollution that is difficult to identify and control. Point sources of pollution are more harmful than non-point sources of pollution. Point sources of pollution are more expensive to control than non-point sources of pollution. Point sources of pollution are easier to manage than non-point sources of pollution. 10. What is the hydraulic retention time (HRT) of an aeration basin with a volume of 100 m³ and a flow rate of 10 m³/h? 10 hours 1 hours 100 hours 1000 hours 11. What is the main goal of solid and hazardous waste management? To protect human health and the environment from the adverse effects of solid and hazardous waste. To reduce the cost of waste management. To increase the efficiency of waste management. To improve the aesthetics of waste management. 12. What is the correct sequence of components in the domestic water supply system shown in the diagram? Water main → gate valve → backflow preventer → pressure reducing valve → water meter → house main → fixture valves → fixtures Water main → gate valve → pressure reducing valve → backflow preventer → water meter → house main → fixture valves → fixtures Water main → gate valve → backflow preventer → water meter → pressure reducing valve → house main → fixture valves → fixtures Water main → backflow preventer → gate valve → pressure reducing valve → water meter → house main → fixture valves → fixtures 13. What is the transmissivity of an aquifer with a thickness of 10 m and a hydraulic conductivity of 0.1 m/day? 1 m²/day 0.1 m²/day 10 m²/day 100 m²/day 14. What is the main difference between noise pollution and soil pollution? Noise pollution is caused by excessive noise, while soil pollution is caused by the contamination of soil with harmful chemicals or other substances. Noise pollution is more harmful than soil pollution. Noise pollution is more expensive to control than soil pollution. Noise pollution is more difficult to manage than soil pollution. 15. What is the main purpose of the National Environmental Policy Act (NEPA)? To ensure that environmental impacts are considered in all federal decision-making. To protect endangered species. To regulate air pollution. To manage water resources. 16. What is the main purpose of the Clean Water Act? To protect the nation's waters from pollution. To provide drinking water to all Americans. To regulate the use of pesticides and fertilizers. To manage hazardous waste. 17. What are the three main components of a CWSS system? Water supply, sanitation, and hygiene promotion. Water supply, sanitation, and wastewater treatment. Water supply, sanitation, and solid waste management. Water supply, sanitation, and drainage. 18. What is the flow rate of wastewater through a sewer pipe with a diameter of 1000 mm and a velocity of 0.75 m/s? 5.74 m³/s 4.74 m³/s 6.74 m³/s 7.74 m³/s 19. What is the difference between a landfill and an incinerator? A landfill is a site where waste is disposed of by burying it, while an incinerator is a facility where waste is disposed of by burning it. Landfills are more expensive than incinerators. Landfills are less efficient than incinerators. Landfills are less environmentally friendly than incinerators. 20. What is the specific yield of an aquifer if the volume of water released from a unit volume of aquifer is 0.2? 0.2 0.1 1 10 21. What is the main goal of community water supply and sanitation (CWSS)? To provide safe and reliable drinking water and sanitation services to all members of a community. To reduce the cost of water and sanitation services. To increase the supply of water and sanitation services. To improve the quality of water and sanitation services. 22. What is the head loss due to friction in a pipe with a length of 100 m, a diameter of 10 cm, and a flow rate of 0.785 m³/s? 6.3 m 0.63 m 63 m 630 m 23. What is the main goal of water treatment? To remove contaminants from water to make it safe for drinking and other uses. To reduce the cost of water To increase the supply of water To improve the taste of water 24. What is the flow rate of water through a pipe with a diameter of 10 cm and a velocity of 1 m/s? 0.785 m³/s 0.0785 m³/s 7.85 m³/s 78.5 m³/s 1 out of 1 Time is Up! Time's up
