GATE ES area:environmental-engineering PYQs & Answers — Page 4

Questions 31–40 of 55. Imported answers require independent review unless marked reviewed.

Centrifugal pumps with suction pipe (shown by solid arrow) and delivery pipe (shown by dotted arrow) are shown in the figures. Choose the option that gives the correct connection

Your answerChoose one option.

Diagram for Environmental Science and Engineering question 20

Diagram for Environmental Science and Engineering question 20 (figure 2)

Diagram for Environmental Science and Engineering question 20 (figure 3)

Diagram for Environmental Science and Engineering question 20 (figure 4)

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Carbon dioxide is used in recarbonation process. A solution has 1 mole/L supersaturated calcium carbonate. Estimated amount of carbon dioxide (in grams) needed to completely convert calcium carbonate to calcium ions in 1 litre solution is

Your answerChoose one option.

44.000 gram

0.044 gram

40.000 gram

0.040 gram

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A river water sample has pH of 4 and suspended solids concentration of 100 mg/L. If, alum is chosen as a coagulant, what will be the coagulation mechanism?

Your answerChoose one option.

Ionic layer compression only

Sweep coagulation and Polymer bridging

Polymer bridging only

Charge neutralization, surface adsorption, ionic layer compression

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Leachate generated from a legacy municipal solid waste dumping site has to be collected and managed carefully. Which one of the following statements is correct in the context of treatment of leachate from such a site?

Your answerChoose one option.

Setting chamber followed by micro-filtration units are required.

Modular treatment units targeting dissolved organic matter and salts are required.

Only biological treatment units like AS with extended aeration are required.

Only a combination of anaerobic-aerobic treatment units is required.

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For effluents generated by a molasses based distillery and wood based pulp and paper industry, which of the following statement(s) is/are NOT correct?

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

Both the effluents have dark colour.

Both the effluents have high toxicity.

Both the effluents generally have BOD greater than 15,000 ppm.

Both the effluents have high pH.

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According to the National Ambient Air Quality Standards (Central Pollution Control Board, Govt. of India, notification 2009) which of the following statement(s) is/are correct?

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

SO₂ and NO₂ have annual average standards; while O₃ and CO have eight hour average standards.

SO₂ and CO have annual average standards; while O₃ and NO₂ have eight hour average standards.

SO₂ and CO have eight hour average standards; while O₃ and NO₂ have hourly average standards.

SO₂ and NO₂ have 24 hour average standards; while O₃ and CO have hourly average standards.

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A venturimeter along with a differential manometer was installed to measure flow in a water pipeline as shown in the following figure (not drawn to scale).

Diagram for Environmental Science and Engineering question 58

Taking specific weight of water as 9810 N/m

, the pressure difference (in Pa, rounded off to one decimal place) between point Q and P is __________.

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Two reservoirs having a difference of 10 m in their water surface elevations are connected by a pipeline (diameter = 10 cm, length = 50 m, and friction factor

). If the last 25 m length of the pipeline is replaced by a same material pipe of diameter 20 cm then neglecting minor losses the discharge (in %, rounded off to one decimal place) increase will be __________.

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The depth of flow (in m, rounded off to two decimal places) in a hydraulically efficient rectangular channel (n = 1/80) to carry a discharge of 64 m

/s at bed slope 0.01 is __________.

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Clean water is passed through a bed of uniform spherical sand and at a filtration velocity of 0.002 m/sec. The sand grains are 0.4 mm in diameter and have a specific gravity of 2.65. Bed depth is 0.67m and porosity (η) is 0.35. Given, water density = 998.2 kg/m

; water dynamic viscosity = 1.002×10

Pa.s. Friction factor (

) is given as:

where Re is Reynolds number. The headloss (in m, rounded off to three decimal places) calculated using the Carmen-Kozeny equation is __________.

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GATE ES area:environmental-engineering PYQs

Question 20

Question 21

Question 22

Question 24

Question 29

Question 47

Question 58

Question 59

Question 60

Question 61