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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 – Sand Filters – 1

Posted on July 24, 2018 by Manish

This set of Waste Water Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Sand Filters – 1”.

1. What is the size of the small rapid sand filter bed?
a) 50 sqm
b) 80 sqm
c) 100 sqm
d) 120 sqm
View Answer

Answer: c
Explanation: The size of the small rapid sand filter is 100 sqm. The minimum size required is 100 sqm for the efficient working of the sand filter with a gravel depth of 500 mm and 0.7-1 m of sand.
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2. Pre-treatment of beds is not necessary.
a) True
b) False
View Answer

Answer: b
Explanation: The penetration of suspended solids is deep through the filter bed. The length of run is two days. Before starting the operation again, pre-treatment of the rapid sand filter beds is done by coagulation.

3. What is the percentage of bacterial removal in filter beds?
a) 60-70 %
b) 75-80 %
c) 80-90 %
d) 90-99 %
View Answer

Answer: d
Explanation: Practically no biological action occurs but some nitrification occurs where the filtration velocity is relatively slow, where the oxygen content is adequate and where the nitrifying bacteria find favourable nutrients in the water. Bacterial removal efficiency is 90-99 %.

4. What is the effective size of sand used in rapid sand filters?
a) 0.2-0.3 mm
b) 0.3-0.6 mm
c) 0.6-1.2 mm
d) 12-2.4 mm
View Answer

Answer: c
Explanation: The size of the small rapid sand filter bed is 100 sqm. Gravel and sand are used in layers in the bed. The effective size of the sand particles used in the filter bed lies between 0.6-1.2 mm.

5. What is the head loss found in a rapid sand filter?
a) <3
b) >3
c) 0
d) <4
View Answer

Answer: b
Explanation: When the head loss becomes excessive and beyond 1.5-2.5 m, the filter should be cleaned. The maximum head loss experienced in rapid sand filters is usually 3 metres.

6. What is the surface wash rate?
a) 5-6 cum/sqm h
b) 6-7 cum/sqm h
c) 8-10 cum/sqm h
d) 10-12 cum/sqm h
View Answer

Answer: d
Explanation: The specified minimum backwash time for a rapid filter is 5 minutes. The amount of water required to wash a rapid filter may vary from 3-6% of the total amount of water filtered. The surface wash rate is usually 10-12 m3/m2 h.
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7. What is the porosity range during expansion of the filter bed?
a) 0.4-0.5
b) 0.5-0.6
c) 0.1-0.2
d) 0.68-0.7
View Answer

Answer: d
Explanation: There are different types of backwashing recommended for the removing of clogged particles from the filter bed. During backwashing, the filter bed expands and the porosity is the range of 0.68-0.7.

8. Even by high-rate of backwash, efficiency of cleaning is poor.
a) True
b) False
View Answer

Answer: a
Explanation: There are different types of backwashing. High and low rates and water backwashing is done and air scour is carried out prior to water backwashing in few cases and efficiency of cleaning is poor.

9. What is the air scour rate which is provided before a water backwash?
a) 12 cum/ sqm h
b) 15 cum/ sqm h
c) 20 cum/ sqm h
d) 27 cum/ sqm h
View Answer

Answer: d
Explanation: Different types of backwashing. High and low rates and water backwashing is done and air scour is carried out prior to water backwashing in few cases and the air scours rate is 27 m3/m2 h.

10. What is the depth of washing during high-rate water backwash?
a) 3-4 mm
b) 3-6 mm
c) 2-3 mm
d) 1-2 mm
View Answer

Answer: b
Explanation: During high rates of backwashing by water the depth of bed that usually is cleaned is 3-6 mm. 2-3 mm of depth is cleaned by air scour which is followed by low and high rates of water backwashing.

11. What does sand filter remove?
a) TDS
b) TSS
c) BOD
d) COD
View Answer

Answer: b
Explanation: Sand filters remove TSS. This usually constitutes gravel, pebbles and sand as the medium. This is usually prior to an Activated Carbon Filter (ACF).

12. What is the TSS at the outlet of the Pressure Sand Filter (PSF)?
a) <10 ppm
b) 25 ppm
c) 100 ppm
d) >150 ppm
View Answer

Answer: a
Explanation: At the outlet of the filter the TSS is <10 ppm. In case of Side stream filter, we can get an outlet of <5ppm. In case of Dual Media Filter we can get an outlet of <1ppm.
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13. While designing a sand filter what is the velocity that is assumed?
a) 10-12 m/h
b) 15 m/h
c) 20 m/h
d) 30 m/h
View Answer

Answer: a
Explanation: The rise velocity assumed is 10-12 m/hr. Based on this the sizing of the filter is carried out. Based on this the diameter of the vessel is derived.

14. While designing a dual media filter what is the velocity that is assumed?
a) 10-12 m/h
b) 15-18 m/h
c) 20 m/h
d) 30 m/h
View Answer

Answer: b
Explanation: The rise velocity assumed is 15-18 m/hr. Based on this the sizing of the filter is carried out. Based on this the diameter of the vessel is derived.

15. While designing a multimedia filter what is the velocity that is assumed?
a) 10-12 m/h
b) 15-18 m/h
c) 18-20 m/h
d) 30 m/h
View Answer

Answer: c
Explanation: The rise velocity assumed is 18-20 m/hr. Based on this the sizing of the filter is carried out. Based on this the diameter of the vessel is derived.

16. Calculate the diameter of a sand filter with the following data.
Flow: 2200 m3/hr
Velocity: 12 m/hr
a) 15.3 m
b) 15.5 m
c) 16.3 m
d) 16.5 m
View Answer

Answer: a
Explanation: The calculated diameter is 15.3 m. Area is first calculated by dividing the flowrate with velocity. That is 2200/12 =184 m2. Then square root (184 x (4/3.14)) = 15.3 m.

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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