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Cwea Exam (Collection Systems Maintenance) with Questions & Answers To Guarantee A Grade Pass
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Cwea Exam (Collection SystemsMaintenance) with Questions &
Answers To Guarantee A Grade Pass
What is minimum design velocity for a sewer? - ✔✔a minimum of two feet per second
Vitrified clay pipe is what type of pipe? - ✔✔Rigid
What is another name for a manhole? - ✔✔Maintenance hole
What are the four parts of a manhole? - ✔✔lid, cone, barrel and base
What are some sewer testing methods? - ✔✔Air, water, mandrill, smoke, dye, lamping
What are some hydraulic cleaning methods? - ✔✔Flushing, balling, kites, parachutes, poly
pigs (pigging), high velocity cleaning, jetting, skids and tiger tails.
what is the formula for the area of a square? - ✔✔Length x width
The main advantage of using CCTV is what? - ✔✔You can see and record the length and severity
of defective pipe
A hazard that may damage a TV camera going through a sewer is: - ✔✔an offset joint
, What is the formula for the volume of a cube? - ✔✔Length x Width x Height
What is the formula for the area of a circle? - ✔✔0.785 x Diameter x Diameter
What is the formula for the volume of a pipe? - ✔✔0.785 x Diameter x Diameter x Length
A flow of 650 pgm would be how many mgd? - ✔✔0.936
How can the members of a balling crew communicate with each other? - ✔✔Hand Signals
Why must you always know where a cleaning tool is in a sewer? - ✔✔so you know
where obstructions or difficulties are encountered
emergency stoppages in pipelines may be cleared safely by use of: - ✔✔high velocity cleaners
rodents and insects can be controlled by - ✔✔spraying manholes with an approved pesticide
Sources of excessive clear water in a collection system are usually caused by: - ✔✔infiltration from
a high water table
How many types of common shoring are there? - ✔✔6
What is the "dirt" formula? - ✔✔distance = rate x time
What is the total volume (in gallons) of 1,000 feet of 8-inch pipeline? - ✔✔2,611 gallons
What is the most critical task in operation and maintenance of wastewater collection? -
✔✔Keeping wastewater flowing through pipes
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