Environmental Engineering Multiple Choice Questions on “Water Carriage System”.
1. Into how many types, the water carriage system is divided?
a) 2
b) 3
c) 4
d) 5
Answer: b
Clarification: The water carriage system is divided into a separate system, combined system and partially separate system.
2. The number of separate systems in a sewer area are?
a) 2
b) 3
c) 4
d) 6
Answer: a
Clarification: There are two separate systems of sewer, one for the conveyance of foul smell and other in the rain water.
3. The water carriage system is more suitable in rural conditions.
a) True
b) False
Answer: b
Clarification: The water carriage system is more suitable in urban conditions, whereas the conservancy system is more suitable in rural conditions.
4. Which of the following is an advantage of a separate water carriage system?
a) Get choked easily
b) Difficult to clean the sewer
c) Two sets of sewer are used
d) The more uniform character of sewage
Answer: d
Clarification: The sewage in the separate water carriage system will be of more uniform character and it will lend itself more easily to purification.
5. Which of the following is a disadvantage of a separate water carriage system?
a) Low installation charge
b) No loads on treatment units
c) Lesser air contact with small sized sewer
d) Provision of the automatic flushing tank is not required
Answer: c
Clarification: In a separate water carriage system, because of lesser air contact with small sized sewer, foul smell is formed due to the formation of sewage gas.
6. _______ provides only one sewer to carry both foul sewage and rainwater.
a) Separate water carriage system
b) Combined water carriage system
c) Partially combined water carriage system
d) Conservancy system
Answer: b
Clarification: In combined water carriage system, the sewage and the rain water are carried to the treatment units through only one sewer, before its final disposal.
7. Which of the following is correct regarding combined water carriage system?
a) The sewers are of small size
b) The strength of sewer is reduced by dilution
c) Low cost of construction
d) More chances of choking are there
Answer: b
Clarification: In the combined water carriage system, the sewers are of large size, the strength of sewer is reduced by dilution, there is the high cost of construction and rare chances of choking.
8. Which of the following is an advantage of the combined water carriage system?
a) There is more air in large sewer
b) There is the inclusion of storm water
c) There is difficulties in ventilation of large sewer
d) Overflowing of sewer
Answer: a
Clarification: In combined water carriage system, due to more air in large sewer, the sewer gas formed gets diluted and the chances of foul smell reduces.
9. Which of the following is incorrect regarding partially combined water carriage system?
a) The sewers are of reasonable size
b) There is choking of sewer
c) The storm water increases load on treatment units
d) The storm water increases the cost of pumping
Answer: b
Clarification: The storm water permitted in the sewer eliminates its chances of choking. The sewers are completely cleaned during rainy season.
10. The choice of combined water carriage system does not depend on ____________
a) Space consideration
b) Even rainfall pattern
c) Steep topography
d) Pumping requirements
Answer: c
Clarification: The choice of a combined water carriage system depends on space consideration, even rainfall pattern, conversion of existing storm water drains and pumping requirements.