CWEA Collection Systems Maintenance Grades 1 (2024 / 2025 Update) Practice Questions and Verified Answers | 100% Correct | Grade A
Question:
The lack of an unpleasant odor in a manhole, loft station, or other structures
does not always mean that dangerous gases aren't present because:
Answer:
Some dangerous gasses have no odor.
Question:
What should be considered when providing trench shoring?
Answer:
Depth of trench ( anything over 5' needs shoring)
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Question:
Excavations & adjacent areas must be inspected on a daily basis by s competent person for evidence of what types of problems?
Answer:
Hazardous atmosphere, potential cave-ins & protective system failures
Question:
Why must you always know where is cleaning tool is in a sewer?
Answer:
So you know where the obstruction of difficulties are encountered
Question:
Emergency stoppages in pipelines may not be cleared safely by use of: A)hand
rods, B) high-velocity cleaners, C) power rodders, D)Fire hoses
Answer:
Fire hoses
Question:
Yoke, rollers, swivels, pull-in machine, & loader are accessories used in:
Answer:
Power bucket machine cleaning
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Question:
The record log of a hydraulic cleaning operation should include:
Answer:
Type & amount of material removed from downstream manhole
Question:
Sources of excessive clear water in a collections system include:
Answer:
Infiltration from a high water table
Question:
Defect that cause problems in collections systems include:
Answer:
Improper grade of sewer, improper taps & structure failure of manholes
Question:
Flatter sewer line grades may cause added sewer maintenance expense & odor
nuisance. The problem is most likely caused by:
Answer:
A decrease in velocity allowing organic & inorganic solids to settle out
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Question:
What types of control devices are used to stop & start pumps?
Answer:
Floats
Question:
What type of pump is used in lift station wet wells?
Answer:
Submersible
Question:
What is the main purpose of gate valves in a lift station?
Answer:
To isolate the lift station from the collections system during maintenance.
Question:
What can happen as a result of frequent pump station starts and stops?
Answer:
Increased power costs from frequent motor starts
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