GATE Solid and Hazardous Waste Management: Municipal Solid Waste Management – Previous Year Questions
24 GATE previous year questions on Municipal Solid Waste Management (Solid and Hazardous Waste Management, Environmental Science and Engineering) with answers and explanations, from every paper.
- GATE 2021 ES Q23 – Rank municipal-waste components from greatest to least biodegradability.
- GATE 2021 ES Q24 – A 10 kg moisture-free sample loses6 kg when heated950°C without air, and 7 kg at the same temperature with air. Find fixed-carbon percentage.
- GATE 2021 ES Q43 – Match P trommel, Q magnetic separator, R hammer mill, S eddy-current separator to i size reduction, ii aluminium separation, iii screening, iv ferrous…
- GATE 2021 ES Q61 – A 100000-person community produces2.5 kg MSW/person/day. Landfill area 12×10⁴ m²,available depth 25 m including cover. Compacted waste density800…
- GATE 2021 ES Q62 – A stationary-container collection truck spends .1 h unloading each container, two containers per location, and .2 h travelling between locations.…
- GATE 2022 ES Q24 – Which treatment statement is correct for leachate from a legacy municipal-waste dump?
- GATE 2022 ES Q31 – For composting kitchen peelings, select all correct statements.
- GATE 2022 ES Q49 – Under India’s Solid Waste Management Rules2016, select correct statements.
- GATE 2022 ES Q63 – A centrifuge treats1000 L/h water containing2 g/L suspended solids. It captures99% of solids into slurry at 20 g per 100 mL. Find supernatant flow in…
- GATE 2022 ES Q65 – A waste-to-energy furnace receives70 kg/h waste and 300 kcal/h sensible heat in air. Outputs are90000 kcal/h flue gas,10000 kcal/h ash, and heat…
- GATE 2023 ES Q45 – For aerobic composting:I Anaerobic pockets cause most odor problems;II All organic carbon fully degrades in 14 days;III High C/N releases ammonia and…
- GATE 2023 ES Q60 – A city generates1000 tonnes waste/day:15% recycled,40% composted,25% sent to RDF production at 80% mass efficiency, and the rest landfilled. RDF…
- GATE 2023 ES Q63 – Waste ultimate composition by mass is 48%C,6%H,35%O,6%N,5%ash. For1 kg burned, assuming combustion air contains only oxygen/nitrogen, find maximum CO₂…
- GATE 2024 ES Q34 – A digester produces1000 kg methane. Find storage volume in integer litres at 30°C and 3 atm. Use R=.082 L·atm/(mol·K),C12,H1.
- GATE 2024 ES Q60 – Dry waste A contains 2.16% carbon and 1.20% nitrogen;dry B contains 19.10% carbon and .14% nitrogen. Find kg B per kg A to obtain C:N=25,to two…
- GATE 2024 ES Q61 – Food, paper and plastic waste have densities280,80,50 kg/m³. A mixture contains 70%,20%,10% by mass, respectively. Neglect compaction and find mixed…
- GATE 2024 ES Q62 – Find maximum theoretical methane in kg per ton of C 50H 100O 40N,assuming100% anaerobic conversion. Atomic weights:C12,H1,O16,N14. Report to two…
- GATE 2025 ES Q21 – Which components are most likely in the segregated combustible fraction of mixed municipal waste?
- GATE 2025 ES Q29 – Which displayed flowsheets correctly produce RDF from segregated dry waste collected in blue municipal-waste containers? Select all that apply.
- GATE 2025 ES Q62 – A street sweeper starts at P, ends at S, and must traverse every street at least once. Edge lengths in km are shown. Find the minimum total distance…
- GATE 2025 ES Q63 – Waste C 60H 135O 50N 5 is composted aerobically. All ammonia escapes;air contains 23% oxygen by mass and actual air is 100% above stoichiometric.…
- GATE 2026 ES Q23 – Which is NOT part of proximate analysis of municipal solid waste?
- GATE 2026 ES Q61 – An anaerobic system treats OFMSW with moisture content 20%,volatile solids (VS) 90% of dry solids, and biodegradable VS (BVS) 70% of VS.…
- GATE 2026 ES Q62 – Leaves have 50% moisture,.7% dry-basis nitrogen and C/N=50. Sludge has 75% moisture,5.6% dry-basis nitrogen and C/N=6.3. Find kg sludge/kg leaves to…