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Waste Water Engineering Multiple Choice Questions | MCQs | Quiz

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

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•   Sewage Disposal
•   Water Carriage System
•   Dry Weather Flow
•   Minimum Velocity Flow
•   Sewer Sections
•   Sewer System Planning
•   Sewer Appurtenances
•   Pump & Pumping Station-1
•   Pump & Pumping Station-2
•   Valves Different Types
•   Autoclaves
•   Blowers
•   ↓ Characteristics ↓
•   Wastewater - 1
•   Wastewater - 2
•   Chemical Determination
•   Chemical Reactions
•   Mass Transfer Correlation
•   Oxygen Sag Analysis
•   Streams Self Purification
•   Land Treatment Disposal
•   Unit Operation & Processes
•   Reactors Types - 1
•   Reactors Types - 2
•   Wastewater Treatment - 1
•   Wastewater Treatment - 2
•   Sludge Processing - 1
•   Sludge Processing - 2
•   Screens & Comminutors - 1
•   Screens & Comminutors - 2
•   Aerated Grit Chambers
•   Discrete Particles Settling
•   Settling Tank Types
•   Sedimentation Tanks - 1
•   Sedimentation Tanks - 2
•   Chemical Clarification - 1
•   Chemical Clarification - 2
•   Flocculant Settling
•   Sewage Filters
•   Sand Filters - 1
•   Sand Filters - 2
•   Trickling Filters - 1
•   Trickling Filters - 2
•   High Rate Filtration
•   Secondary Clarifiers - 1
•   Secondary Clarifiers - 2
•   Tube Settlers
•   Activated Sludge Process-1
•   Activated Sludge Process-2
•   Diffused Aeration Systems
•   Sludge Production
•   ↓ Treatment Systems ↓
•   Activated Sludge - 1
•   Activated Sludge - 2
•   Secondary Settling
•   Oxidation Ditch
•   Aerobic Ponds
•   Facultative Ponds
•   BOD Removal Methods
•   Moving Bed Bioreactor
•   Moving Bed Reactor
•   Sludge Treatment Process1
•   Sludge Treatment Process2
•   Sludge Characteristics - 1
•   Sludge Characteristics - 2
•   Anaerobic Digestion
•   Septic Tanks
•   Septic Tanks Disposal
•   Oil Removal Methods
•   Lamella Clarifiers
•   Dissolved Air Floatation - 1
•   Dissolved Air Floatation - 2
•   Ultrafiltration
•   Rapid Filtration
•   Disc Filtration - 1
•   Disc Filtration - 2
•   Water Treatment
•   Carbon Adsorption
•   Phosphorus Removal - 1
•   Phosphorus Removal - 2
•   Nitrogen Removal
•   Biological Nitrification
•   Ammonia Stripping
•   Wet Air Oxidation
•   UASB Reactor - 1
•   UASB Reactor - 2
•   Total Dissolved Solids - 1
•   Total Dissolved Solids - 2
•   ↓ Reverse Osmosis ↓
•   Reverse Osmosis
•   Reverse Osmosis Design
•   Membrane Properties - 1
•   Membrane Properties - 2
•   Membranes Fouling
•   ↓ Ion Exchange ↓
•   Ion Exchange Process
•   Media Properties - 1
•   Media Properties - 2
•   Ion Exchange Design
•   Softners
•   Iron & Arsenic Removal - 1
•   Iron & Arsenic Removal - 2
•   Disinfection Process - 1
•   Disinfection Process - 2
•   Chlorinators
•   ↓ Oxidation Process ↓
•   Ozonators
•   H2O2/UV
•   Industrial Wastewater
•   House Drainage Principles
•   Pipes & Traps
•   Sanitary Fittings
•   Plumbing Systems
•   House Drainage Plans
•   Hydrogen Sulphide-Sewers
•   Storm Water Flow
•   Rural Sanitation
•   Dry Refuse Collection
•   Excretal Wastes Disposal
•   Eco-Friendly Toilets
•   Water Conduits Control
•   Water Treatment Plant

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Waste Water Engineering Questions and Answers – Hydrogen Sulphide in Sewers

Posted on July 24, 2018 by Manish

This set of Waste Water Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Hydrogen Sulphide in Sewers”.

1. H2S is intoxicant in nature.
a) True
b) False
View Answer

Answer: b
Explanation: H2S gas can be toxic even at low concentrations. Under certain conditions H2S gas which can corrode the internal walls of sewers, manholes, pump stations and other concrete and steel structures by getting converted to sulphuric acid.
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2. _______ corrodes internal walls of sewers.
a) Hydrochloric acid
b) Sulphuric acid
c) Sulphur dioxide
d) Carbon dioxide
View Answer

Answer: b
Explanation: Under certain conditions H2S gas which can corrode the internal walls of sewers, manholes, pump stations and other concrete and steel structures by getting converted to sulphuric acid.

3. H2S gas is denser than air.
a) True
b) False
View Answer

Answer: a
Explanation: H2S gas is denser than air so it may sit at the bottom of maintenance structures such as tanks, wells, enclosures, pits, buildings, storage areas etc.

4. H2S gas is _______ to generate sulphuric acid.
a) Oxidised
b) Reduced
c) Oxidised and reduced
d) Sulphonated
View Answer

Answer: a
Explanation: H2S gas can be oxidised and converted into sulphuric acid within the sewer headspace on the sewer pipe wall.

5. Hydrogen sulphide is formed under ______ conditions.
a) Aerobic
b) Anaerobic
c) Anaerobic and aerobic
d) Any
View Answer

Answer: b
Explanation: Hydrogen sulphide is formed under anaerobic conditions at low flow velocities and warm temperatures. The rate of release is increased at points of high turbulence and at the outlets of inverted syphons and pressure mains.

6. What is the flow velocity condition required for the formation of hydrogen sulphide?
a) Low
b) Medium
c) High
d) Rapid
View Answer

Answer: a
Explanation: Low flow velocity condition is required for the formation of hydrogen sulphide. Sulphuric acid can corrode the internal walls of sewers, manholes, pump stations and other concrete and steel structures.
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7. What is the temperature condition required for hydrogen sulphide formation?
a) Warm
b) Cold
c) Extreme cold
d) Intermediate
View Answer

Answer: a
Explanation: Warm temperature conditions are required for hydrogen sulphide formation. Hydrogen sulphide is formed under anaerobic conditions at low flow velocities and warm temperatures.

8. The rate of release of H2S is high at the points of ______
a) Low velocity
b) Low flow
c) Low turbulence
d) High turbulence
View Answer

Answer: d
Explanation: The rate of release of H2S is high at the points of high turbulence. Warm temperature conditions are required for hydrogen sulphide formation.

9. What is the exposure limit of H2S in a day?
a) 2 ppm
b) 1 ppm
c) 0.5 ppm
d) 0.1 ppm
View Answer

Answer: d
Explanation: The exposure limit of H2S in a day is 0.1 ppm. The exposure limit of H2S is 2 ppm for 30 minutes. The exposure limit of H2S is 0.014 for 90 days.

10. What is the limit of H2S exposure for 30 minutes?
a) 0.5 ppm
b) 1 ppm
c) 1.5 ppm
d) 2 ppm
View Answer

Answer: d
Explanation: The exposure limit of H2S is 2 ppm for 30 minutes. The exposure limit of H2S in a day is 0.1 ppm. The exposure limit of H2S is 0.014 for 90 days.

11. What is the odour threshold limit of H2S gas?
a) 0.0008 ppm
b) 0.008 ppm
c) 0.08 ppm
d) 0.8 ppm
View Answer

Answer: b
Explanation: The odour threshold limit of H2S gas is 0.008 ppm. 4 ppm causes increased eye problems.

12. What amount of H2S causes increased eye problems?
a) 1 ppm
b) 2 ppm
c) 3 ppm
d) 4 ppm
View Answer

Answer: d
Explanation: 4 ppm causes increased eye problems. 20 ppm causes neurological effects including memory loss and dizziness.
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13. What is the chemical used to prevent H2S gas formation from Magnesium hydroxide?
a) Calcium nitrate
b) Ferric nitrate
c) Oxygen injection
d) Carbon injection
View Answer

Answer: a
Explanation: Calcium nitrate is the chemical used to prevent H2S gas formation from Magnesium hydroxide. Ferric chloride is the chemical used to prevent H2S gas formation from Sodium hydroxide.

14. What is the chemical used to prevent H2S gas formation from Sodium hydroxide?
a) Ferric chloride
b) Magnesium hydroxide
c) Ferric nitrate
d) Calcium nitrate
View Answer

Answer: c
Explanation: Ferric chloride is the chemical used to prevent H2S gas formation from Sodium hydroxide. Calcium nitrate is the chemical used to prevent H2S gas formation from Magnesium hydroxide.

15. What is the chemical used to prevent H2S gas formation from Ferric chloride?
a) Magnesium hydroxide
b) Sodium hydroxide
c) Oxygen injection
d) Ferric nitrate
View Answer

Answer: c
Explanation: Oxygen injection is done to prevent H2S gas formation from Ferric chloride. Calcium nitrate is the chemical used to prevent H2S gas formation from Magnesium hydroxide.

Sanfoundry Global Education & Learning Series – Waste Water Engineering.

To practice all areas of Waste Water Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & 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, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Facebook | Twitter

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