1
GATE CE 2022 Set 2
MCQ (Single Correct Answer)
+2
-0.67

In a city, the chemical formula of biodegradable fraction of municipal solid waste (MSW) is C100H250O80N. 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/m3. Atomic mass : C = 12, H = 1, O = 16, N = 14.

C and H are oxidized completely whereas N is converted only into NH3 during oxidation.

For oxidative degradation of 1 tonne of the waste, the required theoretical volume of air (in m3/tonne) will be (round off the nearest integer)

A
1092
B
4749
C
1418
D
8025
2
GATE CE 2022 Set 2
Numerical
+2
-0

A sewage treatment plant receives sewage at a flow rate of 5000 m3/day. The total suspended solids (TSS) concentration in the sewage at the inlet of primary clarifier is 200 mg/L. After the primary treatment, the TSS concentration in sewage is reduced by 60%. The sludge from the primary clarifier contains 2% solids concentration. Subsequently, the sludge is subjected to gravity thickening process to achieve a solids concentration of 6%. Assume that the density of sludge, before and after thickening, is 1000 kg/m3. The daily volume of the thickened sludge (in m3/day) will be _________. (round off to the nearest integer)

Your input ____
3
GATE CE 2022 Set 2
MCQ (Single Correct Answer)
+1
-0.33

Match the following attributes of a city with the appropriate scale of measurements.

Attribute Scale of measurement
(P) Average temperature ($$^\circ $$C) of a city (I) Interval
(Q) Name of city (II) Oridnal
(R) Population density of a city (III) Nominal
(S) Ranking of a city based on ease of business (IV) Ratio

Which one of the following combinations is correct?

A
(P)-(II), (Q)-(I), (R)-(IV), (S)-(III)
B
(P)-(I), (Q)-(II), (R)-(III), (S)-(IV)
C
(P)-(I), (Q)-(III), (R)-(IV), (S)-(II)
D
(P)-(II), (Q)-(III), (R)-(IV), (S)-(I)
4
GATE CE 2022 Set 2
MCQ (Single Correct Answer)
+1
-0.33

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

A
Waste collection on congested roads, should not occur during rush hours in morning or evening.
B
The last collection point on a route should be as close as possible to the waste disposal facility.
C
Collection should occur in the uphill direction.
D
Collection vehicle should not travel twice down the same street in a day.
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