MAINTENANCE OF WASTEWATER COLLECTION SYSTEM QUESTIONS AND ANSWERS WITH SOLUTIONS 2024

MAINTENANCE OF WASTEWATER
COLLECTION SYSTEM QUESTIONS
AND ANSWERS WITH SOLUTIONS 2024
When a fire hydrant is operated, it should be - ANSWER a. Just opened enough to have flow

b. Opened fully

c. Opened halfway

d. Regulated to the flow required



Which of the following is the MOST common factor leading to the generation of hydrogen sulfide in
sewers? - ANSWER a. Anaerobic conditions

b. Constant high velocity of flow in sewers

c. Low concentrations of ferrous sulfides

d. Presence of fats, oils and grease



Emergency stoppages in sewer lines may NOT be cleared safety by the use of - ANSWER a. Hand rods

b. High velocity of flow in sewers

c. Power rodders

d. Fire hoses



You are the operator of a high velocity cleaner attempting to break a stoppage. The distance of the
leader hose and nozzle on your pressure line is 17 feet. You set the footage counter to read "zero" as the
leader hose coupling enters the pipe. When the counter reads 124 feet you hit an obstruction and can go
no further. Approximately how far is obstruction from the manhole? - ANSWER a. 124 feet

b. 141 feet

c. 107 feet

d. 163 feet



Bucket machine are best used for the removal of - ANSWER a. Grease

b. Roots