GATE CE topic:municipal-solid-wastes PYQs & Answers — Page 2

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Questions 11–18 of 18. Imported answers require independent review unless marked reviewed.

Topic practice 18 questionsPage 2 of 2

At a municipal waste handling facility, 30 metric ton mixture of food waste, yard waste, and paper waste was available. The moisture content of this mixture was found to be 10%. The ideal moisture content for composting this mixture is 50%. The amount of water to be added to this mixture to bring its moisture content to the ideal condition is ______ metric ton. (in integer)

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Which one of the following statements is correct?

Your answerChoose one option.

Pyrolysis is an endothermic process, which takes place in the absence of oxygen.

Pyrolysis is an exothermic process, which takes place in the absence of oxygen.

Combustion is an endothermic process, which takes place in the abundance of oxygen.

Combustion is an exothermic process, which takes place in the absence of oxygen.

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Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

Assertion [a]: One of the best ways to reduce the amount of solid wastes is to reduce the consumption of raw materials.

Reason [r]: Solid wastes are seldom generated when raw materials are converted to goods for consumption.

Your answerChoose one option.

Both [a] and [r] are true and [r] is the correct reason for [a]

Both [a] and [r] are true but [r] is not the correct reason for [a]

Both [a] and [r] are false

[a] is true but [r] is false

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A waste to energy plant burns dry solid waste of composition: Carbon = 35%, Oxygen = 26%, Hydrogen = 10%, Sulphur = 6%, Nitrogen = 3% and Inerts = 20%. Burning rate is 1000 tonnes/d. Oxygen in air by weight is 23%. Assume complete conversion of Carbon to CO₂, Hydrogen to H₂O, Sulphur to SO₂ and Nitrogen to NO₂.

Given Atomic weights: H = 1, C = 12, N = 14, O = 16, S = 32

The stoichiometric (theoretical) amount of air (in tonnes/d, round off to the nearest integer) required for complete burning of this waste, is ________.

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Raw municipal solid waste (MSW) collected from a city contains 70% decomposable material that can be converted to methane. The water content of the decomposable material is 35%. An elemental analysis of the decomposable material yields the following mass percent.\n\nC : H : O : N : other = 44 : 6 : 43 : 0.8 : 6.2\n\nThe methane production of the decomposable material is given by the following stoichiometric relation\n\n

\n\nGiven atomic weights: C = 12, H = 1, O = 16, N = 14. The mass of methane produced (in grams, round off to 1 decimal place) per kg of raw MSW will be __________

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A city generates 40×10

kg of municipal solid waste (MSW) per year, out of which only 10% is recovered/recycled and the rest goes to landfill. The landfill has a single lift of 3 m height and is compacted to a density of 550 kg/m

. If 80% of the landfill is assumed to be MSW, the landfill area (in m

, up to one decimal place) required would be ______

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A waste activated sludge (WAS) is to be blend with green waste (GW). The carbon (C) and nitrogen (N) contents, per kg of WAS and GW, on dry basis are given in the table.

Parameter	WAS	GW
Carbon (g)	54	360
Nitrogen (g)	10	6

The ratio of WAS to GW required (up to two decimal places) to achieve a blend C:N ratio of 20:1 on dry basis _____

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The composition of a municipal solid waste sample is given below:

Component	Percent by Mass	Moisture Content (%)	Energy Content (kJ/kg, on as-discarded basis)
Food Waste	20	70	2500
Paper	10	4	1000
Cardboard	10	4	800
Plastics	10	1	14000
Garden Trimmings	40	60	350
Wood	5	20	14000
Tin Cans	5	2	100

The difference between the energy content of the waste sample calculated on dry basis and as-discarded basis (in kJ/kg) would be

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GATE CE topic:municipal-solid-wastes PYQs

Question 59

Question 11

Question 14

Question 53

Question 41

Question 25

Question 53

Question 50