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House Drainage

Course: Waste Water Engineering — Practice MCQs, solutions, formulas & past entrance questions.

Courses › Waste Water Engineering › House Drainage

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Chapter:

house-drainage (Click to view content)

1. What is water from urinals called?

Black water Yellow water Grey water Brown water

Black water

Soil water or sewage is from WCs and urinals. This is also called black water. Minimum of 100 mm diameter pipes are used for waste water. These can be of cast iron or of PVC.

Hint Answer

2. H₂S gas is ___ to generate sulphuric acid.

Oxidised Reduced Oxidised and reduced Sulphonated

Oxidised

H₂S gas can be oxidised and converted into sulphuric acid within sewer headspace on sewer pipe wall.

Hint Answer

3. What is minimum depth of water required in gully trap?

10 mm 20 mm 40 mm 50 mm

50 mm

Gully traps are deep seal traps, depth of water seal should be 50 mm minimum. It prevents entry of insects from sewer line to waste pipes carrying wastewater.

Hint Answer

4. Which of se is not an important component of house drainage system?

Traps Pipes Sanitary fittings Aerators

Aerators

The important components of house drainage system are traps, pipes and sanitary fittings. Traps should provide enough water seal of around 50 mm with large surface area.

Hint Answer

5. What is chemical used to prevent H₂S gas formation from Magnesium hydroxide?

Calcium nitrate Ferric nitrate Oxygen injection Carbon injection

Calcium nitrate

Calcium nitrate is chemical used to prevent H₂S gas formation from Magnesium hydroxide. Ferric chloride is chemical used to prevent H₂S gas formation from Sodium hydroxide.

Hint Answer

6. What is angle between drains and inspection manholes?

45˚ 90˚ 135˚ 180˚

180˚

The drains should be laid at an angle of 180? between inspection manholes. Drains from different houses should be connected to public sewers only if level permits.

Hint Answer

7. What is minimum depth of water seal in floor trap?

25 mm 50 mm 75 mm 100 mm

50 mm

The floor traps are available in cast iron or UPVC material and have removable grating (JALI) on top of trap and minimum water depths should be 50 mm.

Hint Answer

8. What is standard brick size?

70*100*200 75*115*225 75*110*225 75*115*220

75115225

The bricks shall be clean and best available in area. The bricks shall neir be over burnt nor underburnt. 75 x 115 x 225 is standard size of brick.

Hint Answer

9. Which of se is negative effect owing to drier soil conditions?

Aeration of soil Soil structure Availability of nitrogen Irrigation efficiency

Irrigation efficiency

Aeration of soil increases with improved soil structure and availability of nitrogen. Irrigation efficiency is negative.

Hint Answer

10. Grease should not be allowed to enter normal drainage system.

True False

True

A grease trap should be used when draining waste from kitchens, grease should not be allowed to enter normal drainage system. A grease trap is nothing but a small inspection chamber.

Hint Answer

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All Chapters

View all Chapter and number of question available From each chapter from Waste-Water-Engineering

Wastewater Flow Rates, Collection and Conveyance of Sewage

Wastewater Flow Rates, Collection and Conveyance of Sewage

Hydraulic Design & Construction of Sewers

Hydraulic Design & Construction of Sewers

Sewer Appurtenances & Sewage Pumping

Sewer Appurtenances & Sewage Pumping

Valves, Blowers & Wastewater Characteristics

Valves, Blowers & Wastewater Characteristics

Natural Methods of Wastewater Disposal, Chemical Reaction Engineering and Waste Water Treatment

Natural Methods of Wastewater Disposal, Chemical Reaction Engineering and Waste Water Treatment

Unit Operations for Wastewater Treatment

Unit Operations for Wastewater Treatment

Preliminary Treatment

Preliminary Treatment

Types of Settling Tank

Types of Settling Tank

Sewage Filtration

Sewage Filtration

Activated Sludge Process

Activated Sludge Process

BOD Removal Methods & Miscellaneous Methods

BOD Removal Methods & Miscellaneous Methods

Treatment and Disposal of Sludge

Treatment and Disposal of Sludge

Septic Tanks, Oil and Grease Removal

Septic Tanks, Oil and Grease Removal

Advanced Wastewater Treatment

Advanced Wastewater Treatment

House Drainage

Rural Sanitation

Rural Sanitation

Corrosion control & Instrumentation

Corrosion control & Instrumentation

Topics

This Chapter house-drainage consists of the following topics

House Drainage

What is water from urinals called?

H₂S gas is ___ to generate sulphuric acid.

What is minimum depth of water required in gully trap?

Which of se is not an important component of house drainage system?

What is chemical used to prevent H₂S gas formation from Magnesium hydroxide?

What is angle between drains and inspection manholes?

What is minimum depth of water seal in floor trap?

What is standard brick size?

Which of se is negative effect owing to drier soil conditions?

Grease should not be allowed to enter normal drainage system.

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