NPTEL Municipal Solid Waste Management Week 5 Assignment Answers 2024
1. The feasibility of waste for the incineration process should have:
(a) Moisture content <45%
(b) Moisture content <60%
(c) Ash content <70%
(d) Volatile matter >10%
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2. Using the following data, calculate the higher heating value of a solid fuel.
(Low heating value = 16 kJ/kg, Moisture content = 10%, Weight of hydrogen = 3%)
(a) 42 kJ/kg
(b) 32 kJ/kg
(c) 25 kJ/kg
(d) 44 kJ/kg
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3. The potential for energy generation from waste depends on?
(a) Ash content
(b) Calorific value
(c) Fixed carbon
(d) Moisture content
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4. What is the concentration of ash content in flue gas from a moving grate incinerator?
(a) 5 – 10%
(b) 1 – 4%
(c) 1 – 3%
(d) 11 – 15%
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5. Which component has a higher concentration in RDF?
(a) Organic waste
(b) Inert
(c) Glass/metal
(d) Combustible materials
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6. Which of the incineration residue causes slagging and fouling?
(a) Gas
(b) Fly ash
(c) Tar
(d) None of these
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7. What are the products of gasification?
(a) ash, tar and gas
(b) ash, biooil and gas
(c) char, oil and gas
(d) char, tar and gas
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8. What are the advantages of pyrolysis over incineration?
(a) Can work at high moisture content
(b) Can be operated at high ash content
(c) less corrosion, lower emission of dioxin and high CO2 capturing potential
(d) None of these
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9. Which part of the composting process involves active stabilization?
(a) Mesophilic phase
(b) Thermophilic phase
(c) Maturation phase
(d) Hydrophilic phase
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10. In which phase of the composting process is humus produced?
(a) Mesophilic phase
(b) Thermophilic phase
(c) Maturation phase
(d) None of these
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11. Average bacterial and fungal populations during composting process is ……… respectively?
(a) 102 – 105 and 106 – 1012
(b) 105 – 106 and 102 – 1012
(c) 102 – 1012 and 105 – 106
(d) 106 – 1012 and 102 – 105
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12. Which of the following phases of composting microbial profile declines?
(a) Mesophilic phase
(b) Thermophilic phase
(c) Curing phase
(d) None of these
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13. What type of composting process is performed in Hot and Cold Climates?
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14. What is/are the factors that doesn’t influence the oxygen demand during composting process?
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