Grade 3: CWEA Collection Systems Maintenance Exam (Latest 2025/ 2026 Update) Questions with Verified Answers | 100% Correct | Grade A.

Grade 3: CWEA Collection Systems
Maintenance Exam (Latest 2025/ 2026
Update) Questions with Verified Answers
| 100% Correct | Grade A.

What can happen if water-based substances are used to
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extinguish electrical fires? i,- i,-




a. Nothing but extinguish the fire
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b. The fumes are not harmful
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c. Receive an electrical shock
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d. They will corrode the electrical contacts
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electrical shock i,-




When testing a manhole for explosive gases when should the first
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tests be made?
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a. After removing the manhole cover
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b. Before removing the manhole cover
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c. At any time
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d. After ventilation
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Atmospheric hazards encountered in manholes can include: i,- i,- i,- i,- i,- i,-

,a. non-explosive atmospheres.
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b. non-toxic atmosphere.
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c. lack of oxygen.
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d. non-flammable atmospheres.
i,- i,- i,- i,-c. lack of oxygen.
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When setting up to ventilate a manhole, the air inlet should be
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how many feet above street level?
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a. 4.0
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b. 3.0
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c. 2.0
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d. 1.0
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Which chemical may be used for odor control in a sewer system?
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a. Calcium chloride
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b. Hydrogen peroxide
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c. Oxidized aluminum
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d. Sodium chloride
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What information must be on a warning tag attached to a switch
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that has been locked out?
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a. Directions for removing tag.
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, b. Name of nearest physician to call in case of emergency.
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c. Signature of person who locked out switch and who is the only
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person authorized to remove tag. i,- i,- i,- i,- i,-




d. Time to unlock switch.
i,- c. Signature of person who locked
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out switch and who is the only person authorized to remove tag.
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Under what conditions must each member of the rescue service
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practice permit space rescues? i,- i,- i,-




a. At least once a year in a simulated situation or by the
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satisfactory performance of an actual rescue. i,- i,- i,- i,- i,- i,-




b. At least twice a year in simulated situations.
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c. At least once a year in simulated situation using non-
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representative space conditions i,- i,- i,-




d. At least four times a year.
i,- i,- a. At least once a year in a
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simulated situation or by the satisfactory performance of an
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actual rescue. i,-




How is a permit-required space described?
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a. Has or may contain atmospheric, engulfment, design, or other
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serious health/safety hazard. i,- i,-




b. Is large enough to enter and work in and is meant for
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continuous occupancy. i,- i,-