GATE CE Municipal Solid Wastes PYQs & Answers

Questions 1–10 of 18. Imported answers require independent review unless marked reviewed.

Identify the treatment technology/technologies NOT recommended for highly biodegradable organic solid wastes.

Your answerSelect all correct options. You can choose more than one.

Biohydrogen

Anaerobic digestion

Composting

Open dumping

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Organic fraction of municipal solid waste (OFMSW) with bulk density of 315 kg/m³ and water content of 30% is mixed with municipal sludge of bulk density 700 kg/m³ and water content of 70%, such that the water content of the mixture is 40%. The amount (in kg) of sludge to be mixed per kg of OFMSW (rounded off to 2 decimal places) and the density of the mixture (in kg/m³) (rounded off to the nearest integer) are calculated. Which of the following options is/are true:

Your answerSelect all correct options. You can choose more than one.

0.33 kg of sludge added per kg of OFMSW

Density of the mixture is 365 kg/m³

0.66 kg of sludge added per kg of OFMSW

Density of the mixture is 450 kg/m³

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The following table gives various components of Municipal Solid Waste (MSW) and a list of treatment/separation techniques.

Component of MSW	Treatment/separation technique
P - Ferrous metals Q - Aluminum and copper R - Food waste S - Cardboard	i - Incineration ii - Rapid composting iii - Eddy current separator iv - Magnetic separator

The CORRECT match is

Your answerChoose one option.

P-iii, Q-iv, R-i, S-ii

P-iv, Q-iii, R-ii, S-i

P-iii, Q-iv, R-ii, S-i

P-iv, Q-iii, R-i, S-ii

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In the context of Municipal Solid Waste Management, ‘Haul’ in ‘Hauled Container System operated in conventional mode’ includes the ________.

Your answerChoose one option.

time spent by the transport truck at the disposal site

time spent by the transport truck in traveling between a pickup point and the disposal site with a loaded container

time spent by the transport truck in picking up a loaded container at a pickup point

time spent by the transport truck in driving from the depot to the first pickup point

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Which of the following statements is/are TRUE for the Refuse-Derived Fuel (RDF) in the context of Municipal Solid Waste (MSW) management?

Your answerSelect all correct options. You can choose more than one.

Higher Heating Value (HHV) of the unprocessed MSW is higher than the HHV of RDF processed from the same MSW

RDF can be made in the powdered form

Inorganic fraction of MSW is mostly converted to RDF

RDF cannot be used in conjunction with oil

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Which of the following statements is/are TRUE for the aerobic composting of sewage sludge?

Your answerSelect all correct options. You can choose more than one.

Bulking agent is added during the composting process to reduce the porosity of the solid mixture

Leachate can be generated during composting

Actinomycetes are involved in the process

In-vessel composting systems cannot be operated in the plug-flow mode

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The composition and energy content of a representative solid waste sample are given in the table. If the moisture content for the waste is 26%, the energy content of the solid waste on dry-weight basis is __________________ MJ/kg (round off to one decimal place).

Component	Percent by mass	Energy content as-discarded basis (MJ/kg)
Food waste	20	4.5
Paper	45	16.0
Cardboard	5	14.0
Plastics	10	32.0
Others	20	8.0

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In a solid waste handling facility, the moisture contents (MC) of food waste, paper waste, and glass waste were found to be

, and

, respectively. Similarly, the energy contents (EC) of plastic waste, food waste, and glass waste were found to be

, and

, respectively. Which of the following statement(s) is/are correct?

Your answerSelect all correct options. You can choose more than one.

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To design an optimum municipal solid waste collection route, which of the following is/are NOT desired:

Your answerSelect all correct options. You can choose more than one.

Collection vehicle should not travel twice down the same street in a day.

Waste collection on congested roads should not occur during rush hours in morning or evening.

Collection should occur in the uphill direction.

The last collection point on a route should be as close as possible to the waste disposal facility.

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In a city, the chemical formula of biodegradable fraction of municipal solid waste (MSW) is C

N. The waste has to be treated by forced-aeration composting process for which air requirement has to be estimated.

Assume oxygen in air (by weight) = 23 %, and density of air = 1.3 kg/m

. Atomic mass: C = 12, H = 1, O = 16, N = 14.

C and H are oxidized completely whereas N is converted only into NH

during oxidation.

For oxidative degradation of 1 tonne of the waste, the required theoretical volume of air (in m

/tonne) will be (round off to the nearest integer)

Your answerChoose one option.

749

825

1418

1092

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GATE CE Municipal Solid Wastes PYQs

How to practice Municipal Solid Wastes

Question 27

Question 46

Question 21

Question 22

Question 28

Question 49

Question 62

Question 26

Question 27

Question 43