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CWEA Collections Grade 2 Practice Test with Questions & Answers
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CWEA Collections Grade 2 Practice Test with Questions & Answers
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CWEA Collections Grade 2 PracticeTest with Questions & Answers
What is the first thing to consider when selecting a solution to clear a stoppage in a sewer?
- ✔✔Cause of stoppage
The interior of 300 feet of 12-inch pipe is uniformly coated with one inch of grease. How many
gallons will this pipe hold when filled with water? - ✔✔12 inches (diameter of pipe) - 2 inches
(grease on pipe) = 10 inches
Convert inches to feet:
10 inches x (1 foot / 12 inches) = 0.833 feet
Volume of a right regular cylinder:
V = 0.785 x Diameter x Diameter x Length of Pipe
V = 0.785 x 0.833 ft x 0.833 ft x 300 ft
V = 163.41 cubic feet
Convert to Gallons:
, 163.41 cu ft x (7.48 gal / 1 cu ft) = 1223.31 gal
Infiltration can be caused by cracked pipes, true or false? - ✔✔True
The main reason for adding sodium hypochlorite to sewers is to control: - ✔✔Odor
Roots can enter collection systems through pipe cracks, true or false? - ✔✔True
The lowest point on the inside of a pipeline is called the: - ✔✔Invert
How often must an excavation site and adjacent areas be inspected for hazardous conditions? -
✔✔Daily
Working in an un-sloped trench with no shoring is one option of Protective Shoring Systems, true
or false? - ✔✔False. Some options are proper stopping or benching of the sides of the
excavation, supporting the sides of a trench with shoring, and using a shield in the excavation area.
Proper operation and maintenance of wastewater collection is keeping wastewater flowing through
pipes, true or false? - ✔✔True
Minimum design velocity for a sewer should greater than: - ✔✔2 feet per second
Vitrified Clay pipe is a Rigid type of pipe, true or false? - ✔✔True
Barrels, lids, cones, and backflow devices are all included in Manholes, true or false? - ✔✔False.
All are included except for backflow devices.
Sewer testing methods include air, water, mandrill, and sewage, true or false? - ✔✔False.
Sewer testing methods do not include sewage.
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