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Environmental Engineering Multiple Choice Questions | MCQs | Quiz

Environmental Engineering Interview Questions and Answers
Practice Environmental Engineering questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Water Demand
•   Population Forecasting
•   ↓ Water Characteristics ↓
•   Physical Characteristics
•   Chemical Characteristics
•   Biological Characteristics
•   Various Unit Operations
•   Screens & Aerators Types
•   Sedimentation Theory
•   Sedimentation Design
•   Sedimentation Coagulation
•   Flocculation & Clarification
•   Filtration Theory
•   Filter Media
•   Slow Sand Filter
•   Rapid Sand Filter
•   Filter Operation Problems
•   Slow & Rapid Sand Filter
•   Filtration Hydraulics
•   Pressure Filter
•   Dual & Mixed Media Filter
•   Various Other Filters
•   Disinfection Methods
•   Chlorination
•   Chlorination Forms
•   Chlorination Factors
•   Chemical Disinfection
•   Iodine & Ozone Treatment
•   Hardness Types
•   Lime Soda Process
•   Zeolite Process
•   Iron & Manganese Removal
•   Activated Carbon Treatment
•   Fluoridation & Defluoridation
•   Desalination
•   Pumps Types
•   Centrifugal Pump
•   Reciprocating Pump
•   Well Pump
•   Pumping Units Selection
•   Pipes Types
•   Valves Types
•   Distribution System Layout
•   Service Connection
•   Conservancy System
•   Water Carriage System
•   Dry Weather Flow
•   Storm Water Flow
•   Rational Method
•   Hydraulic Formulae
•   Minimum & Maximum Flow
•   Hydraulic Elements
•   Egg Shaped Sewers
•   Sewers Types
•   Sewers Materials
•   Sewers Joints & Shapes
•   Sewer Forces & Loads
•   Sewer Devices
•   Sewage Pumping
•   ↓ Waste Water ↓
•   Physical Characteristics
•   Chemical Characteristics
•   Biological Characteristics
•   Oxygen Demand
•   Relative Stability
•   Sewage Disposal
•   River - Pollution Zones
•   Oxygen Sag Curve
•   Lake - Biological Zones
•   Unit Operations Types
•   Racks & Screen
•   Tanks & Vacuum Floatation
•   Settling Types
•   Settling Tanks Types
•   Sedimentation Tank Design
•   Chemical Clarification
•   Sewage Filter Types
•   Conventional Trickling Filter
•   High Rate Trickling Filter
•   Diffused Air System
•   Sludge Treatment
•   Sludge Digestion Tank
•   Activated Sludge Plant
•   Sludge Dewatering
•   Stabilization Ponds
•   Septic Tank Construction
•   Imhoff Tank Construction
•   Municipal Solid Waste
•   Air Pollutants
•   Stack Height Design
•   Plumes Types
•   Air Pollution Control Device
•   Air Pollutants Dispersion
•   Air Pollution Analysis
•   Air Pollution Effects - 1
•   Air Pollution Effects - 2
•   Air Pollution Sources - 1
•   Air Pollution Sources - 2
•   Air Pollution Meteorology
•   Air Quality
•   Atmosphere
•   Climate Model
•   Greenhouse Gases - 1
•   Greenhouse Gases - 2
•   Ozone Depletion
•   Particulates
•   Acid Rain
•   Aerosols

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Environmental Engineering Questions and Answers – Oxygen Sag Curve

Posted on September 19, 2017 by Manish

This set of Environmental Engineering Multiple Choice Questions & Answers (MCQs) focuses on ” Oxygen Sag Curve”.

Answer question 1-7 using the figure given below.
environmental-engineering-questions-answers-oxygen-sag-curve-q1-to-q7

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Figure 75.1: Oxygen sag curve

1. The yellow curve represents
a) Deoxygenation curve
b) Reoxygenation curve
c) Oxygen sag curve
d) Equilibrium concentration of oxygen
View Answer

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

2. Which of the following is represented by the green curve?
a) Deoxygenation curve
b) Reoxygenation curve
c) Oxygen sag curve
d) Equilibrium concentration of oxygen
View Answer

Answer: b
Explanation: The green curve represents the reoxygenation curve, which depicts the supply of oxygen from the atmosphere to counterbalance the oxygen deficit.
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3. The maximum deficiency of dissolved oxygen is represented by
a) Dotted blue line
b) Green curve
c) Yellow curve
d) Violet curve
View Answer

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

4. Which of the following represents the oxygen sag curve?
a) Dotted blue line
b) Green curve
c) Yellow curve
d) Red curve
View Answer

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

5. The oxygen deficit is maximum when
a) Rate of reaeration is 0
b) Rate of deoxygenation is 0
c) Rate of reaeration equals the rate of deoxygenation
d) Rate of reaeration > rate of deoxygenation
View Answer

Answer: c
Explanation: 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.
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6. When the BOD of wastewater increases, then
a) Rate of reaeration decreases
b) Rate of oxygen deficit increases
c) Rate of oxygen deficit decreases
d) Amount of oxygen in wastewater increases
View Answer

Answer: b
Explanation: When the BOD of wastewater increases, the amount of dissolved oxygen decreases, so the rate of oxygen deficit increases.

7. State whether the following statement is true or false.
Rate of aeration is independent of the D.O content of wastewater.
a) True
b) False
View Answer

Answer: b
Explanation: Rate of aeration = -(Rate of dissolved oxygen in water) which implies that the rate of aeration increases with increase in reduction of dissolved oxygen from wastewater.

8. The reoxygenation constant at temperature ‘T’ is expressed by
a) KRT = KR20 (1.016)T
b) KRT = KR20 (1.047) T-20
c) KRT = KR20 (1.016)T-20
d) KRT = KR20 (1.047)T
View Answer

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

Sanfoundry Global Education & Learning Series – Environmental Engineering.
To practice all areas of Environmental Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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« Environmental Engineering Questions and Answers – Pollution Zones in River
Environmental Engineering Questions and Answers – Biological Zones in Lake »
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