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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 – Population Equivalent and Relative Stability

Posted on September 19, 2017 by Manish

This set of Environmental Engineering Questions and Answers for Entrance exams focuses on “Population Equivalent and Relative Stability”.

1. The average standard BOD of domestic sewage is measured in
a) ppm
b) Kg/day
c) Kg per person per day
d) Number of persons per day
View Answer

Answer: c
Explanation: The average standard BOD of domestic sewage is measured in 0.08Kg per person per day.
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2. Which of the following id the correct expression of population equivalent?
a) BOD of industrial sewage in kg/day * 0.08
b) 0.08 * BOD of industrial sewage kg/day
c) BOD of industrial sewage kg/day / 0.08kg/person/day
d) BOD of industrial sewage kg/day +0.08
View Answer

Answer: c
Explanation: BOD of industrial sewage kg/day /(0.08kg/person/day) where 0.08 represents the average standard BOD of domestic sewage.

3. The expression of relative stability at 20oC is given by
a) S = (1-(0.794)T20
b) S = 100 (1-(0.794) T20)
c) S = 1-(0.794) T20
d) S = 100 (0.794) T20
View Answer

Answer: b
Explanation: The expression of relative stability at 20oC is given by
S=100 (1-(0.794)T20) where T20 represents the incubation period at 20oC.

4. The expression of relative stability at 37oC is given by
a) S = (1-(0.794)T37
b) S = 100 (1-(0.794) T37)
c) S = 1-(0.794) T20
d) S = 100 (1-(0.630)T37)
View Answer

Answer: d
Explanation: The expression of relative stability at 37oC is given by
S = 100 (1-(0.630) T37) where T37 represents the incubation period at 37oC.

5. What is the value of BOD of industrial sewage in kg/day, given population equivalent as 6000 persons?
a) 480
b) 160
c) 270
d) 100
View Answer

Answer: a
Explanation: BOD of industrial sewage in kg/day = Population equivalent * Average standard BOD of domestic sewage = 6000*0.08 = 480kg/day.
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6. Calculate the percentage of relative stability, given 5 day incubation period at 370C.
a) 50%
b) 60%
c) 90%
d) 99%
View Answer

Answer: c
Explanation: Relative stability at 370C is given by, S = 100 (1-(0.630) T37) = 100 (1-(0.630)5) = 90.08% which is approximately 90%.

7. _____ is the amount of oxygen required to oxidize both organic and inorganic matter in sewage.
a) Turbidity
b) BOD
c) COD
d) DO
View Answer

Answer: c
Explanation: COD is the amount of oxygen required to oxidize both organic and inorganic matter in sewage. It is always greater than BOD.

8. COD is abbreviated as
a) Chemical oxygen demand
b) Complex oxygen demand
c) Customary oxygen demand
d) Chemical oxygen deficit
View Answer

Answer: a
Explanation: COD is abbreviated as chemical oxygen demand. It is measured in ppm or mg/L.

9. The oxidizing agent used in COD test is
a) Potassium chloride
b) Potassium per-manganate
c) Potassium chromate
d) Potassium dichromate
View Answer

Answer: d
Explanation: In COD test, oxidization of organic matter takes place by potassium dichromate in the presence of sulphuric acid using ferroin as indicator.

10. 5 days BOD at 20oC is ___ of total demand.
a) 20%
b) 47%
c) 68%
d) 100%
View Answer

Answer: c
Explanation: 5 days BOD at 20oC is the standard BOD which is 68% of total demand, whereas 10 days BOD at 20oC is 90% of total demand.
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11. Which of the following expression is correct regarding deoxygenation constant where symbols have their usual meaning?
a) KDT = KD20 + (1.047)T-20
b) KDT = KD20 / (1.047) T-20
c) KDT = KD20 (1.047) T-20
d) KDT = KD20 (1.04T
View Answer

Answer: c
Explanation: KDT = KD20 (1.047) T-20 where, KDT is the deoxygenation constant at temperature ‘T’ and KD20 is the deoxygenation constant at 20oC.

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

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