GATE ES kind:question PYQs & Answers — Page 33

Questions 321–330 of 390. Imported answers require independent review unless marked reviewed.

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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A sewage treatment plant with a capacity of 10 million litres per day (MLD) is treating the sewage through an aerobic biological process. The inlet and outlet BOD are measured as 100 and 30 mg/l, respectively. If the mixed microbial culture has an observed biomass yield of 0.5 g Volatile Suspended Solids (VSS)/g BOD, the sludge production rate (in kg per day, rounded off to one decimal place) when the plant is operating at 80% capacity will be __________.

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A centrifuge is processing 1000 litres per hour of water containing 2 g per litre of suspended solids. The thickened slurry coming out of the centrifuge has solids concentration of 20 g per 100 ml. If the centrifuge has 99% efficiency based on solids separation, the flow rate (in litres per hour, rounded off to one decimal place) of the supernatant stream will be __________.

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A ground level source emits 1000 g per day of SO

. In vicinity of the source, ambient temperature is measured at 10 m and 110 m as 25°C and 24.5°C, respectively. The mean wind speed is found to be 2 m per second. The dispersion coefficients at 1000 m downwind distance from the source are given in table below:

	Dispersion coefficients (in m)
	Stable	Neutral	Unstable
Crosswind direction	50.5	80.0	156.0
Vertical direction	21.4	41.5	110.2

Estimated ground level concentration (in μg/m

, rounded off to two decimal places) of SO

at a downwind distance of 1000 m (at the plume centerline) from the source is __________.

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Figure below gives the heat inflow into the furnace of a waste-to-energy plant along with the heat outflows from the furnace.

Diagram for Environmental Science and Engineering question 65

Assume: (i) total heat loss equal to 3% of heat released while burning waste, (ii) sensible heat of the waste is negligible, (iii) complete burning of the waste is ensured. If the waste feed rate into this plant is 70 kg/h, the heat content of the waste (in kcal/kg, rounded off to one decimal place) is __________.

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The current population of a city is 11,02,500. If it has been increasing at the rate of 5% per annum, what was its population 2 years ago?

Your answerChoose one option.

9,92,500

9,95,006

10,00,000

12,51,506

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and

are positive integers and

, then,

Your answerChoose one option.

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Diagram for Environmental Science and Engineering question 3

The least number of squares that must be added so that the line P-Q becomes the line of symmetry is

Your answerChoose one option.

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Nostalgia is to anticipation as ______ is to ______ Which one of the following options maintains a similar logical relation in the above sentence?

Your answerChoose one option.

Present, past

Future, past

Past, future

Future, present

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Consider the following sentences: (i) I woke up from sleep. (ii) I woked up from sleep. (iii) I was woken up from sleep. (iv) I was wokened up from sleep. Which of the above sentences are grammatically CORRECT?

Your answerChoose one option.

(i) and (ii)

(i) and (iii)

(ii) and (iii)

(i) and (iv)

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GATE ES kind:question PYQs

Question 61

Question 62

Question 63

Question 64

Question 65

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Question 2

Question 3

Question 4

Question 5