Grade 3 Practice Exam 2023 with

CWEA Collections System Maintenance Grade 3 Practice Exam 2023 with Complete solutions A Flagger should Stand?

• On the shoulder adjacent to traffic being controlled
• In the closed lane before stopping vehicle traffic
• In the traffic lane.
• As stated in "A" or "B" above. - Correct Answer D. As stated in "A" or "B" above.

Legally responsible officials are required to report category 1 sanitary sewer overflows?

• Within 30 days
• Before end of the day
• As soon as possible
• Within 2 hours - Correct Answer D. Within 2 hours

When working in confined spaces or sewers, what form of lighting would you use?

• Mirrors to direct the sunlight or explosion proof lighting.
• Ordinary electric lights
• Propane, Gas, or kerosene lanterns
• Special matches - Correct Answer A. Mirrors to direct the sunlight or explosion proof

lighting.What can happen if water-based substances are used to extinguish electrical fires?

• Nothing but extinguish the fire
• The fumes are not harmful
• Receive an electrical shock
• They will corrode the electrical contacts - Correct Answer c. Receive an electrical

shock When testing a manhole for explosive gases when should the first tests be made?

• After removing the manhole cover
• Before removing the manhole cover
• At any time
• After ventilation - Correct Answer b. Before removing the manhole cover

Atmospheric hazards encountered in manholes can include:

• non-explosive atmospheres.
• non-toxic atmosphere.
• lack of oxygen.
• non-flammable atmospheres. - Correct Answer c. lack of oxygen.

When setting up to ventilate a manhole, the air inlet should be how many feet above street level? 1 / 2

• 4.0
• 3.0
• 2.0
• 1.0 - Correct Answer c. 2.0

Which chemical may be used for odor control in a sewer system?

• Calcium chloride
• Hydrogen peroxide
• Oxidized aluminum
• Sodium chloride - Correct Answer b. Hydrogen peroxide

What information must be on a warning tag attached to a switch that has been locked out?

• Directions for removing tag.
• Name of nearest physician to call in case of emergency.
• Signature of person who locked out switch and who is the only person authorized to

remove tag.

• Time to unlock switch. - Correct Answer c. Signature of person who locked out switch

and who is the only person authorized to remove tag.Under what conditions must each member of the rescue service practice permit space rescues?

• At least once a year in a simulated situation or by the satisfactory performance of an

actual rescue.

• At least twice a year in simulated situations.
• At least once a year in simulated situation using non-representative space conditions
• At least four times a year. - Correct Answer a. At least once a year in a simulated

situation or by the satisfactory performance of an actual rescue.How is a permit-required space described?

• Has or may contain atmospheric, engulfment, design, or other serious health/safety

hazard.

• Is large enough to enter and work in and is meant for continuous occupancy.
• Is large enough to enter and work in and has an unrestricted entry/exit.
• Never contains an atmospheric or engulfment hazard. - Correct Answer a. Has or

may contain atmospheric, engulfment, design, or other serious health/safety hazard.What are the three duties of personnel in a Confined Space entry?

• Authorized entrants, parking attendants, entry supervisors.
• Unauthorized entrants, attendants, entry supervisors.
• Authorized entrants, attendants, entry supervisors.
• Authorized entrants, attendants, evening supervisors - Correct Answer c. Authorized

entrants, attendants, entry supervisors.What is an important element of hydrogen sulfide production?

• Flow velocity.
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