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Test: Oxygen Deficit Curve - Civil Engineering (CE) MCQ


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8 Questions MCQ Test - Test: Oxygen Deficit Curve

Test: Oxygen Deficit Curve for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Test: Oxygen Deficit Curve questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Oxygen Deficit Curve MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Oxygen Deficit Curve below.
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Test: Oxygen Deficit Curve - Question 1

Which of the following is represented by the green curve in the following figure?

Figure: Oxygen sag curve

Detailed Solution for Test: Oxygen Deficit Curve - Question 1

The green curve represents the reoxygenation curve, which depicts the supply of oxygen from the atmosphere to counterbalance the oxygen deficit.

Test: Oxygen Deficit Curve - Question 2

What is yellow curve represents in the following figure?

Figure: Oxygen sag curve

Detailed Solution for Test: Oxygen Deficit Curve - Question 2

The yellow curve represents the deoxygenation curve, which depicts the depletion of dissolved oxygen in the absence of aeration.

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Test: Oxygen Deficit Curve - Question 3

Which of the following represents the oxygen sag curve in the following figure?

Figure: Oxygen sag curve

Detailed Solution for Test: Oxygen Deficit Curve - Question 3

The oxygen sag curve is represented by the red curve. It is also called as an oxygen deficit curve.

Test: Oxygen Deficit Curve - Question 4

The maximum deficiency of dissolved oxygen is represented by

Figure: Oxygen sag curve

Detailed Solution for Test: Oxygen Deficit Curve - Question 4

The maximum deficiency of dissolved oxygen is represented by the dotted blue line. It is finding with respect to the equilibrium concentration of oxygen.

Test: Oxygen Deficit Curve - Question 5

When the BOD of wastewater increases, then?

Figure: Oxygen sag curve

Detailed Solution for Test: Oxygen Deficit Curve - Question 5

When the BOD of wastewater increases, the amount of dissolved oxygen decreases, so the rate of oxygen deficit increases.

Test: Oxygen Deficit Curve - Question 6

The oxygen deficit is maximum when?

Figure: Oxygen sag curve

Detailed Solution for Test: Oxygen Deficit Curve - Question 6

The rate of oxygen deficit is the sum of the rate of reaeration and the rate of deoxygenation and it is maximum when the rate of reaeration equals the rate of deoxygenation.

Test: Oxygen Deficit Curve - Question 7

The 'Sag' in the dissolved oxygen curve results because: 

Detailed Solution for Test: Oxygen Deficit Curve - Question 7

Oxygen sag curve of river manifest dissolved oxygen deficit.
The difference between saturated dissolved oxygen content and the actual dissolved oxygen content in the stream at any point during self-purification process is called Oxygen sag 

Oxygen sag curve or oxygen deficit curve is obtained by algebraic addition of deoxygenation and reoxygenation curve.

Test: Oxygen Deficit Curve - Question 8

The reoxygenation constant at temperature ‘T’ is expressed by ________

Detailed Solution for Test: Oxygen Deficit Curve - Question 8

The reoxygenation constant at temperature ‘T’, KRT = KR20 (1.016)T-20, where KR20 is the reoxygenation constant at 20ºC.

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