Environmental Engineering Multiple Choice Questions on “Types of Sewers”.
1. Which type of sewer serves as an outlet for large territory?
a) Lateral sewer
b) Main sewer
c) Branch sewer
d) Separate sewer
Answer: b
Clarification: Main sewer acts as an outlet for the large territory as it receives sewage from many tributary branches.
2. Which sewer collects sewage directly from the house?
a) Main sewer
b) Outfall sewer
c) Lateral sewer
d) Intercepting sewer
Answer: c
Clarification: The first stage of collection of sewage starts from the house which is done by Lateral sewer.
3. _______ sewer collects sewage from collecting system to a disposal plant?
a) House sewer
b) Outfall sewer
c) Lateral sewer
d) Separate sewer
Answer: b
Clarification: The Outfall sewer is a sewer that carries the sewage from collecting systems and transfers it to a point of final discharge i.e a disposal plant.
4. Which sewer carries both sewage and storm water?
a) Outfall sewer
b) Separate sewer
c) Main sewer
d) Combined sewer
Answer: d
Clarification: Combined sewer carries both the sewage and the rain water from the roofs of the house and from the street.
5. Which sewer is also called as submain sewer?
a) Branch sewer
b) Separate sewer
c) Main sewer
d) Lateral sewer
Answer: a
Clarification: Submain sewer receives sewage from small area which finally get discharged into the main sewer. It is also called as branch sewer.
6. Which sewer is used to carry the excess flow of existing sewer?
a) Branch sewer
b) Relief sewer
c) Main sewer
d) Lateral sewer
Answer: a
Clarification: The Relief sewer is used to carry the excess flow of the existing sewer. It is also called as overflow sewer.
7. Asbestos cement sewers are made from __________
a) Cement, silica
b) Asbestos fibre, copper
c) Asbestos fibre, cement, silica
d) Asbestos fibre, magnesium
Answer: c
Clarification: Asbestos cement sewers are made from the composition of asbestos fibre, cement, silica asbestos fibre acts as a reinforcing material.
8. Which of the following is a disadvantage of asbestos cement sewer?
a) They are light weight
b) They can be easily jointed
c) They are brittle
d) Inside surface is smooth
Answer: c
Clarification: Asbestos cement sewer is weak against the impact force and requires care in handling.
9. Asbestos cement sewer offers resistant to sulfide corrosion.
a) True
b) False
Answer: b
Clarification: Asbestos cement sewer is used as verticals only because they are prone to sulfide corrosion.
Global Education & Learning Series – Environmental Engineering .