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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.

Get Started

•   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 – Mechanical Aeration System, Treatment of Sludge

Posted on September 19, 2017 by Manish

This set of Environmental Engineering Multiple Choice Questions & Answers focuses on “Mechanical Aeration System , Treatment of Sludge”.

1. The device used for the aeration in the combined aerator is
a) Header pipe
b) Diffuser plate and paddles
c) Cone with spiral vanes
d) Diffuser plate
View Answer

Answer: b
Explanation: In combined aeration, both diffused air aeration and mechanical aeration take place using both diffuser plate and paddles.
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2. The detention period of the Sheffield mechanical aeration tank is
a) 15 hours
b) 1minute
c) 1 hour
d) 4 hours
View Answer

Answer: a
Explanation: The detention period of a Sheffield mechanical aeration tank is 15 hours. Its return sludge is 15-20% of sewage flow.

3. The minimum detention period of combined aerator is
a) 1hour
b) 2hours
c) 3hours
d) 4hours
View Answer

Answer: c
Explanation: The detention period of combined aerator lies between 3 to 4 hours and the minimum detention period is 3 hours.

4. The speed at which the bubbles are formed in the simplex aerator
a) 15rpm
b) 20rpm
c) 60rpm
d) 30rpm
View Answer

Answer: c
Explanation: The cones, with spiral vanes rotates at a high speed of 60rpm that results in the formation of bubbles in a simplex aerator resulting in the aeration of sewage.

5. Dorroco aerator is a type of
a) Combined aerator
b) Mechanical aerator
c) Ridge and furrow type aerator
d) Spiral flow type aerator
View Answer

Answer: a
Explanation: Dorroco aerator is a type of combined aerator which is efficient in comparison to diffused air and mechanical aerator.
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6. Simplex aerator is a type of
a) Combined aerator
b) Mechanical aerator
c) Ridge and furrow type aerator
d) Spiral flow type aerator
View Answer

Answer: b
Explanation: Simplex aerator is a type of mechanical aerator where a square or rectangular tank with a hopper bottom is used.

7. Which gas is produced in aerobic digestion of sludge?
a) NO2
b) CO2
c) O2
d) H2S
View Answer

Answer: b
Explanation: Carbon dioxide gas is produced in the aerobic digestion of sludge by the oxidation of organic matter by bacteria into CO2.

8. Which of the following process is not involved in the treatment of sludge?
a) Dewatering
b) Drying
c) Flocculation
d) Conditioning
View Answer

Answer: c
Explanation: The process involved in the treatment of sludge are thickening, stabilization, dewatering and dying.

9. Which of the following is the final stage in the sludge treatment process?
a) Digestion
b) Dewatering
c) Drying
d) Thickening
View Answer

Answer: c
Explanation: Drying of the sludge is the final stage in the sludge treatment process where the most stable form of sludge is obtained.

10. In which sludge treatment process, the organic solids are converted into more stable form?
a) Dewatering
b) Thickening
c) Digestion
d) Conditioning
View Answer

Answer: c
Explanation: In the sludge digestion process, the organic solids are converted into more stable form. It makes the dewatering and drying process of sludge simpler.
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11. The sludge treatment process to increase the solid content of sludge is
a) Dewatering
b) Thickening
c) Conditioning
d) Drying
View Answer

Answer: b
Explanation: In sludge thickening, the solid content of sewage is increased by gravity flotation and clarifier.

12. The process of removal of water from the sludge is called ______
a) Dewatering
b) Thickening
c) Digestion
d) Drying
View Answer

Answer: a
Explanation: Dewatering is the process of removal of water from the sludge. It can be done by drying or subjected the sludge with pressure.

13. In which sludge treatment process, the sludge is treated with chemicals?
a) Dewatering
b) Thickening
c) Conditioning
d) Drying
View Answer

Answer: c
Explanation: In sludge conditioning, the sludge is treated with chemicals in order to separate the water from the sludge and improving the dewatering characteristics of sludge.

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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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer and SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage & Cluster Administration, Advanced C Programming, SAN Storage Technologies, SCSI Internals and Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him below:
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