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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 – Corrosion Control in Water Conduits

Posted on July 24, 2018 by Manish

This set of Waste Water Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Corrosion Control in Water Conduits”.

1. Corrosion is the deterioration of materials by chemical interaction with their environment.
a) True
b) False
View Answer

Answer: a
Explanation: Corrosion is the deterioration of materials by chemical interaction with their environment. The term corrosion is sometimes also applied to the degradation of plastics, concrete and wood, but generally refers to metals.
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2. Which is the most widely used material in water conduits?
a) Steel
b) Aluminium
c) Copper
d) Nickel
View Answer

Answer: a
Explanation: The most widely used metal is iron (usually as steel). The term corrosion is sometimes also applied to the degradation of plastics, concrete and wood, but generally refers to metals.

3. A loss in mechanical strength is due to ______
a) Chemicals
b) Reduction of metal thickness
c) Water flow
d) Water velocity
View Answer

Answer: b
Explanation: Reduction of metal thickness leading to loss of mechanical strength and structural failure or breakdown. When the metal is lost in localised zones so as to give a crack like structure, very considerable weakening may result from quite a small amount of metal loss.

4. The corroding piece of metal is described as a “mixed electrode”.
a) True
b) False
View Answer

Answer: a
Explanation: The corroding piece of metal is described as a “mixed electrode” since simultaneous anodic and cathodic reactions are proceeding on its surface.

5. What is pH below which pH increases?
a) 7
b) 5
c) 4
d) 3
View Answer

Answer: c
Explanation: In the range of 4-10 corrosion rate is fairly independent of pH, but it increases rapidly when the pH falls below 4.
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6. Increase in __________ concentration usually gives an increase in corrosion rate.
a) Carbon
b) Oxygen
c) Nitrogen
d) Iron
View Answer

Answer: b
Explanation: Increase in oxygen concentration usually gives an increase in corrosion rate. Corrosion under the deposits can lead to the possibility of pitting (severe attack in small spots).

7. Stainless steel is protected by _______
a) Iron oxide
b) Nitrous oxide
c) Chromium sesquioxide
d) Carbon monoxide
View Answer

Answer: c
Explanation: Alloying the metal to produce a more corrosion resistant alloy, e.g. stainless steel, in which ordinary steel is alloyed with chromium and nickel. Stainless steel is protected by an invisibly thin, naturally formed film of chromium sesquioxide Cr2O3.

8. What is pH range for oxygen removal?
a) 3.5-4.5
b) 6.5-8.5
c) 10-12
d) 12-13.5
View Answer

Answer: b
Explanation: By the removal of oxygen from water systems in the pH range 6.5-8.5 one of the components required for corrosion would be absent.

9. ______ are classified as dangerous inhibitors.
a) Cathodic inhibitors
b) Anodic inhibitors
c) Voltage
d) Current flow
View Answer

Answer: b
Explanation: If an anodic inhibitor is not present at a concentration level sufficient to block off all the anodic sites, localised attack such as pitting corrosion can become a serious problem.

10. Which ions are used as cathodic inhibitors?
a) Ferric irons
b) Aluminium ions
c) Zinc ions
d) Nickel ions
View Answer

Answer: c
Explanation: There are other cathodic reactions and additives that suppress these reactions called cathodic inhibitors. They function by reducing the available area for the cathodic reaction. This is often achieved by precipitating an insoluble species onto the cathodic sites. Zinc ions are used as cathodic inhibitors because of the precipitation of Zn(OH)2 at cathodic sites as a consequence of the localised high pH.
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11. What is the reduced potential required to prevent the corrosion of steel?
a) 350 mV
b) 250 mV
c) 150 mV
d) 50 mV
View Answer

Answer: a
Explanation: This process called cathodic protection and can only be applied if there is a suitable conducting medium such as earth or water through which a 9 [CORROSION&PROTECTION/BM] current can flow.

12. Galvanizing is the process of applying _______ over steel.
a) Carbon
b) Aluminium
c) Zinc
d) Nickel
View Answer

Answer: c
Explanation: The process of applying zinc over steel is called “galvanizing” and has been used to protect iron and steel from rusting for over two hundred years.

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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