CWEA COLLECTIONS GRADE 2 AND GRADE 3 EXAM NEWEST ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
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CWEA COLLECTIONS GRADE 3 EXAM NEWEST 2024-
2025 ACTUAL EXAM COMPLETE 80 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
Hydrogen peroxide controls odors in sewers by:
a. decreasing the dissolved oxygen.
b. neutralizing the PH.
c. oxidizing sulfide compounds.
d. providing a source of hydrogen ions. – ANSWER- c. oxidizing sulfide
compounds.
Construction of a wastewater pipeline under a highway or railway
without disrupting the traffic is done by?
a. Drag lining.
b. Dredging.
c. Embankment excavation.
d. Boring and jacking. – ANSWER- d. Boring and jacking.
When a grade conflict exists between a water main and a sewer main,
which of the following is the best solution?
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a. Build a manhole around the sewer main and continue the water main
through the manhole.
b. Drop the sewer service under the water main and let it work like a
siphon.
c. Have the water main adjusted and hold the grade on the sewer main.
d. Raise the sewer over the water main and install a sewer pump station.
- ANSWER- c. Have the water main adjusted and hold the grade on the
sewer main.
The reason newly constructed collection system sewers should be
inspected is to:
a. determine if the contractor has complied with plans and specifications.
b. determine if smoke tests will be successful.
c. determine if dye tests will be successful.
d. determine if the streets are paved. – ANSWER- a. determine if the
contractor has complied with plans and specifications.
A source of infiltration in a collection system is:
a. new pipes.
b. proper joint pipes.
c. pipe liners
d. broken pipe joints – ANSWER- d. broken pipe joints
What are the advantages of a video tape recording system?
a. Cheaper than a Polaroid camera.
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b. Record and play private video tapes.
c. The ability to see what’s happening when the camera is underwater. d.
The length and severity of defective areas that can be recorded for later
study. – ANSWER- d. The length and severity of defective areas that can
be recorded for later study.
Before conducting smoke testing you should:
a. warn the public after smoke testing is completed.
b. notify local police and fire departments only if a fire is started.
c. notify local animal control departments in advance of testing.
d. notify public, local police, and fire departments in advance of testing.
- ANSWER- d. notify public, local police, and fire departments in
advance of testing.
Manholes are installed in sewer lines for the access of:
a. backflow devices.
b. personnel and materials
c. traffic control devices.
d. survey equipment. – ANSWER- b. personnel and materials
Anaerobic wastewater is frequently corrosive to materials it contacts,
especially:
a. coal tar enamel.
b. concrete.
c. stainless Steel.
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1 | P a g e
CWEA COLLECTIONS GRADE 2 EXAM NEWEST 2024-
2025 ACTUAL EXAM COMPLETE 80 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
The main reason for adding sodium hypochlorite to sewers is to
control: – ANSWER- Odor
Roots can enter collection systems through pipe cracks, true or
false? – ANSWER- True
The lowest point on the inside of a pipeline is called the: –
ANSWER- Invert
How often must an excavation site and adjacent areas be
inspected for hazardous conditions? – ANSWER- Daily
Working in an un-sloped trench with no shoring is one option of
Protective Shoring Systems, true or false? – ANSWER- 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.
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Proper operation and maintenance of wastewater collection is
keeping wastewater flowing through pipes, true or false? –
ANSWER- True
Minimum design velocity for a sewer should greater than: –
ANSWER- 2 feet per second
Vitrified Clay pipe is a Rigid type of pipe, true or false? –
ANSWER- True
Barrels, lids, cones, and backflow devices are all included in
Manholes, true or false? – ANSWER- False. All are included
except for backflow devices.
Sewer testing methods include air, water, mandrill, and sewage,
true or false? – ANSWER- False. Sewer testing methods do not
include sewage.
Using high velocity cleaners is one method included in
hydraulic sewer cleaning, true or false? – ANSWER- True
A flow of 650 gpm would be how many MGD? – ANSWER650 gpm x (1440 min / 1 day) = 936000 gpd
936000 x (1 MG / 1000000 gal) = 0.936 MGD
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