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CWEA COLLECTIONS GRADE 3 EXAM LATEST 2024-2025 BEST 2
VERSIONS ALL 200 QUESTIONS AND CORRECT ANSWERS
ALREADY GRADED A+
CWEA COLLECTIONS GRADE 3 EXAM A
Hydrogen peroxide controls odors in sewers by:
- decreasing the dissolved oxygen.
- neutralizing the PH.
- oxidizing sulfide compounds.
- 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?
- Drag lining.
- Dredging.
- Embankment excavation.
- 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?
- Build a manhole around the sewer main and continue the water main through the manhole. 1 / 4
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- Drop the sewer service under the water main and let it work like a siphon.
- Have the water main adjusted and hold the grade on the sewer main.
- 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:
- determine if the contractor has complied with plans and specifications.
- determine if smoke tests will be successful.
- determine if dye tests will be successful.
- 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:
- new pipes.
- proper joint pipes.
- pipe liners
- broken pipe joints - ANSWER-d. broken pipe joints
What are the advantages of a video tape recording system? 2 / 4
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- Cheaper than a Polaroid camera.
- Record and play private video tapes.
- 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:
- warn the public after smoke testing is completed.
- notify local police and fire departments only if a fire is started.
- notify local animal control departments in advance of testing.
- 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:
- backflow devices.
- personnel and materials
- traffic control devices.
- survey equipment. - ANSWER-b. personnel and materials
Anaerobic wastewater is frequently corrosive to materials it contacts, especially: 3 / 4
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- coal tar enamel.
- concrete.
- stainless Steel.
- plastic. - ANSWER-b. concrete.
Pipe materials that are the least susceptible to corrosion by acids formed from gases generated
in sewers is:
- ACP.
- CIP.
- RCP.
- VCP. - ANSWER-d. VCP.
Repairs to manholes include:
- adjusting the alignment.
- correcting cavitation damages.
- raising frame and cover to grade.
- tightening packing - ANSWER-c. raising frame and cover to grade.
Liners are installed in sewers to correct problems caused by:
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