1) This refers to a layer of floating material on the slurry. a) Scum b) Sludge c) Toxic Material d) Substrate 2) This refers to the number of days a slurry stays inside a digester for digestion. a) Loading rate b) Seeding time c) Retention time d) Gas production rate 3) This refers to any water and airtight container designed for the process of anaerobic microbiological degradation of organic matter into which the slurry is introduced for digestion and methanization. a) Aerobic Reactor b) Bioreactor c) Gas chamber d) Reactor 4) What do you call a plant consisting of digester and a moving gasholder in a fermenting slurry or in a separate water jacket? a) Balloon Type b) Floating Type c) Fixed Type d) Dome Type 5) For mixing a slurry for regular loading, how many liters of water should be added to 100 kg of manure? a) 10 L b) 100 L c) 1000 L d) 1500 L 6) According to PAES 413:2001, what is the recommended stirring practice if agitation is necessary in a biogas digester? a) Stir continuously for 6 minutes, rotating 360° in one direction every morning. b) Stir once a day for 10 minutes, rotating 360° in random direction c) Stir for 3 minutes in the morning and 3 minutes in the afternoon, rotating 360° in both direction d) Stir for 3 minutes in the morning and 7 minutes in the afternoon, rotating 360° in alternating directions 7) You are assigned to repair a cracked section of a biogas digester wall. According to PAES 413:2001, which of the following procedures correctly follows the standard? a) Clean and smoothen the crack edges, apply two layers of plaster, then paint the surface after one week b) Roughen and clean the damaged area, apply chicken wire reinforcement 10 cm from both sides, then plaster using 1:2 mortar mix c) Roughen and clean the edges, attach 2-3 layers of chicken wire with nails 30 cm from either side of the crack, apply 13 mm thick 1:3 mortar, and seal with wax/parafin after drying for two weeks d) Patch the crack using epoxy sealant, cover with plastic mesh, and coat with waterproofing compound within 24 hours 8) In the initial loading of a biogas digester, what percentage of the total slurry volume should be added as starter or seeding material when the digester is about 25% full? a) 1-3% b) 5-10% c) 10-15% d) 15-20% 9) According to PAES 413:2001, what is the normal ph range for biogas digestion? a) 5.5-7.0 b) 6.0-7.5 c) 7.0-8.5 d) 8.5-9.5 10) At what pH level does the digester medium become toxic to methanogenic bacteria, according to PAES 413:2001 a) Below 5.5 b) Below 6.2 c) Below 6.5 d) Below 7.0 11) According to PAES 413:2001, what is the recommended C/N ratio range for effective anaerobic digestion? a) 1:10-1:15 b) 1:20-1:30 c) 1:30-1:40 d) 1:35-1:45 12) Which of the following acids is not typically produced during the acidification stage in biogas digestion? a) Acetic Acid b) Propionic Acid c) Sulfuric Acid d) Butyric Acid 13) In hydrolysis, which of the following best describes the transformation that occurs? a) Simple acids are converted into methane b) Complex organic compounds are solubilized into simpler ones c) Methane and CO2 are formed from lipids and proteins d) Inorganic materials are converted into organic acids 14) Which of the following reactions correctly represents a pathway for methane production during methanization? a) CH4 + CO2 → CH3COOH b) CH3COOH → CH4 + CO2 c) CH3COOH → CH4 + H2O d) CO2 + O2 → CH4 15) How many heads of breeding buffalo are needed as a source of manure to generate 1,000 m3 of biogas a day if the retention period is 25 days. The mean daily manure production manure production of breeding buffalo is 13.5 kg/head while its specific gas production for 25-day manure retention is half of that of chicken dung. a) 504 b) 405 c) 540 d) 450 16) Used to convert dissolved or suspended materials into a form more readily separated from the liquid waste being treated. a) Secondary treatment b) Primary treatment c) Influent d) Effluent 17) Controlled decomposition of organic matter by microorganisms, mainly bacteria and fungi, into a humus-like product. a) Composting amendment b) Grit c) Windrow composting d) Composting 18) Storage where liquid waste is stored before final disposal. a) Lagoon b) Disposal site c) Holding pond d) Facultative lagoon 19) The standard test for measuring the pollution potential of wastewater. a) BOD5 b) COD c) pH d) TSS 20) Which field of engineering involves timber extraction, reforestation practices, and the application of techniques that promote sustainable forest operations? a) Agricultural and Biosystems Engineering b) Environmental Engineering c) Forest Engineering d) Civil Engineering 21) Which of the following is the correct sequence of steps in the timber extraction process? a) Skidding, log processing, felling, trasportation b) Transportation, felling, skidding, log processing c) Felling, log processing, skidding, transportation d) Log processing, skidding, transportation, felling 22) Identify a) Groove b) T&G c) Box d) Dado 23) Identify a) Dowel b) Dovetail c) Groove d) Dado 24) A term applied to wood after it is sawed or sliced into boards, planks, etc. a) Lumber b) Timber c) Slab d) Flitch 25) A radical cracks originating at the heart of the logs commonly found in old trees. a) Heart shake b) Wind shake c) Star Shake d) Knot 26) Determine the total board foot of lumber that could be derived from a 70 cm diameter by 7 m long a) 720 b) 702 c) 830 d) 803 27) What is the total board foot of 10 pieces 2 in by 15 cm by 5 m wood? a) 164 b) 70 c) 125 d) 50 28) CDM stands for a) Clean Development Mechanism b) Climate Disaster Mitigation c) Carbon Disposal Management d) Conservation and Development Model 29) What convention creates CDM? a) Kyoto Protocol b) Paris Agreement c) Montreal Protocol d) Stockholm Protocol 30) What climate treaty targets a limit of 1.5°C to global warming. a) Kyoto Protocol b) Paris Agreement c) Montreal Protocol d) Stockholm Protocol 31) What is a measure of the relative climate impact of a given greenhouse gas relative to the impact of carbon dioxide? a) Carbon sequestration index b) Emission Intensity Factor c) Global Warming Potential d) Atmospheric Residence Time 32) What is the global warming potential of methane in the fifth assessment of IPCC a) 21 b) 25 c) 28 d) 1 33) According to 2023 World Risk Report, what was the Philippines global rank in terms of vulnerability to climate change? a) First b) Second c) Third d) Fourth 34) A poultry farm operates with 30,000 birds per cycle, completing 5 grow cycles per year. Using the provided emission factor of 0.023 kg/head/year for CH4 and adjusting for 38 days grow time, what is the approximate annual methane emission? a) 139 kg/year b) 276 kg/year c) 359 kg/year d) 522 kg/year 35) A poultry farm operates with 30,000 birds per cycle, completing 5 grow cycles per year. Using the provided emission factor of 0.023 kg/head/year for CH4 and adjusting for 38 days grow time, what is the equivalent carbon dioxide in reference to the fifth assessment report value of IPCC?? a) 7.52 tons/year b) 8.99 tons/year c) 9.65 tons/year d) 10.05 tons/year 36) The wastewater, either treated or untreated, discharged from a reservoir, basin, or treatment plant. a) Effluent b) Influent c) Turbid water d) Slurry 37) It is the soluble form of nitrogen and is easily leached beyond the root zone of plants. The principal sources of this form of nitrogen from agricultural activities are animal waste and commercial fertilizers. a) ammoniacal nitrogen b) nitrate c) nitrite d) Kjeldahl nitrogen 38) Optimum moisture content wet basis for manure composting. a) 30% b) 40% c) 60% d) 80% 39) A republic act providing for the development and promotion of organic agriculture in the Philippines. a) RA 9367 b) RA 9275 c) RA 10915 d) RA 10068 40) The estimated proportion of methane in biogas. a) 40% b) 50% c) 60% d) 70% 41) The estimated proportion of carbon dioxide in biogas for digesters using 1:1 water-manure ratio. a) 40% b) 50% c) 60% d) 70% 42) The nonflammable component of biogas occupying significant volume. a) water vapor b) carbon dioxide c) hydrogen d) oxygen 43) Water and manure mixture. a) slurry b) scum c) sewerage d) grit 44) The metal-corrosive component of biogas in small amount which smells like a rotten egg. a) Hydrogen Sulfide b) Carbon Dioxide c) Nitrous Oxide d) Acetic Acid 45) The breaking down of organic matter in a water solution or in a suspension into simpler and more biologically stable compounds. a) Ammonification b) Digestion c) Adsorption d) Absorption 46) Which of the following is the law addressing climate change adaptation in the Philippines? a) RA 9513 b) RA 10068 c) RA 9729 d) RA 8749 47) What is the main government agency responsible for implementing the Philippine Clean Air Act? a) DOH b) DOST c) DENR d) DA 48) Which of the following law was enacted to protect the countries water bodies from pollution? a) RA 9275 b) RA 8749 c) RA 9003 d) RA 9279 49) Which of the following is considered the most abundant natural greenhouse gas in the atmosphere? a) Carbon Dioxide b) Methane c) Nitroud Oxide d) Water Vapor 50) Minimum temperature requirements for composting pile. a) 45°C b) 55°C c) 60°C d) 65°C 51) It is an arrangement of compost mix in long, narrow piles that are periodically turned to maintain aerobic condition. a) Windrow composting b) Bin composting c) Ground composting d) Aerated Static Pile composting 52) Which of the following is the correct flow of solid waste management? a) Production, Collection, Treatment, Transfer, and Utilization b) Production, Collection, Transfer, Storage, Treatment, Transfer, Utilization c) Production, Transfer, Collection, Transfer, Storage, Transfer, Utilization d) Production, Collection, Transfer, Treatment, Storage, Transfer, Utilization 53) What is the percentage of oxygen to be provided to the composting mass to be adequately ventilated? a) 5% b) 10% c) 15% d) 20% 54) A process where fungi digest the carbons not degraded during composting and further stabilize the nutrients. a) Curing b) Leachate c) Digestion d) Composting 55) Which of the following compost material is high in nitrogen content? a) Wood chips b) Rice straw c) Chicken dung d) Cow manure 56) Typical composting time for windrow type composting method. a) 1 month b) 2 months c) 3 months d) 4 months 57) Typical composting time for in-vessel composting method. a) 1 month b) 2 months c) 3 months d) 4 months 58) What is the reaction rate coefficient at 30°C if BOD of waste water sample incubated 5 days and 20°C is 180 mg/L. Assume ultimate BOD is 305 mg/L and temperature correction factor is 1.047. a) 0.18 d-1 b) 0.81 d-1 c) 0.38 d-1 d) 0.28 d-1 59) Flaw in lumber that is characterized by separation along the lenghtwise grain. These are present even before the tree is cut. a) Wane b) Warp c) Shake d) Knot 60) It is part of the total solids in wastewater largely removed by filtering or centrifuging. a) Fixed solids b) Suspended solids c) Dissolved solids d) Volatile solids 61) The ultimate BOD of swine wastewater if BOD5 at 20°C is 150 mg/L and reaction rate constant is 0.25 day-1. a) 2.10 g/L b) 210 g/L c) 21.0 g/L d) 0.21 g/L 62) How many dairy cattles can emit 46.5 Gg of CH4 per year from manure management The emission factor is 31 kg/head/year. a) 1,000,000 heads b) 2,000,000 heads c) 1,500,000 heads d) 500,000 heads 63) It is a cementing agent that binds the cellulose together to form wood. a) Lignin b) Glue c) Starch d) Hemicellulose 64) The amount paid to project owners from CDM fund for carbon emission reduction projects. a) Carbon Credit Value b) Emission Credit Value c) Carbon Development Value d) Carbon Trading Value 65) In the CDM, how much will the project owner of a new covered lagoon biodigester receive annually for the first 10 years if his biodigester produces 7,000 tons of CH4 and 3,000 tons of CO2 per year. Assume current carbon credit cost is Php 100 per tons of CO2 equivalent a) 1,000,000 b) 70,000 c) 7,000,000 d) 15,000,000 66) Which Philippine Law aims to regulate or reduce the pollutants in the air? a) RA 9275 b) RA 9003 c) RA 8749 d) RA 7586 67) Working volume of biogas digester if hydraulic retention time is 25 days and manure inflow is 5 m3/day. a) 5 m3 b) 10 m3 c) 100 m3 d) 125 m3 68) Color of biogas during daytime in outdoor areas. a) blue b) yellow c) red d) colorless 69) How many liters of water should be added to every kilo of manure for mixing of slurry for regular loading to biogas digester. a) 1 L b) 2 L c) 3 L d) 4 L 70) Plastic sheet for constructing a balloon and bed lining in covered lagoon biogas plant a) Polyethylene b) High Density Polyethylene c) Polyvinyl Chloride d) High Density Polyvinyl

Environmental Engineering

аутор
Одштампај
Угради

Табела

Визуелни стил

Поставке

Промени шаблон

Врати аутоматски сачувано: ?