CWEA COLLECTIONS SYSTEM MAINTENANCE
GRADE 3 COMPLETE STUDY GUIDE WITH
SOLVED QUESTIONS
◉ Legally responsible officials are required to report category 1
sanitary sewer overflows?
A. Within 30 days
B. Before end of the day
C. As soon as possible
D. Within 2 hours.
Answer: D. Within 2 hours
◉ When working in confined spaces or sewers, what form of lighting
would you use?
A. Mirrors to direct the sunlight or explosion proof lighting.
B. Ordinary electric lights
C. Propane, Gas, or kerosene lanterns
D. Special matches
Answer: A. Mirrors to direct the sunlight or explosion proof lighting.
,◉ What can happen if water-based substances are used to
extinguish electrical fires?
a. Nothing but extinguish the fire
b. The fumes are not harmful
c. Receive an electrical shock
d. They will corrode the electrical contacts
Answer: c. Receive an electrical shock
◉ When testing a manhole for explosive gases when should the first
tests be made?
a. After removing the manhole cover
b. Before removing the manhole cover
c. At any time
d. After ventilation
Answer: b. Before removing the manhole cover
◉ Atmospheric hazards encountered in manholes can include:
a. non-explosive atmospheres.
b. non-toxic atmosphere.
c. lack of oxygen.
d. non-flammable atmospheres.
Answer: c. lack of oxygen.
, ◉ When setting up to ventilate a manhole, the air inlet should be
how many feet above street level?
a. 4.0
b. 3.0
c. 2.0
d. 1.0
Answer: c. 2.0
◉ Which chemical may be used for odor control in a sewer system?
a. Calcium chloride
b. Hydrogen peroxide
c. Oxidized aluminum
d. Sodium chloride
Answer: b. Hydrogen peroxide
◉ What information must be on a warning tag attached to a switch
that has been locked out?
a. Directions for removing tag.
b. Name of nearest physician to call in case of emergency.
c. Signature of person who locked out switch and who is the only
person authorized to remove tag.
GRADE 3 COMPLETE STUDY GUIDE WITH
SOLVED QUESTIONS
◉ Legally responsible officials are required to report category 1
sanitary sewer overflows?
A. Within 30 days
B. Before end of the day
C. As soon as possible
D. Within 2 hours.
Answer: D. Within 2 hours
◉ When working in confined spaces or sewers, what form of lighting
would you use?
A. Mirrors to direct the sunlight or explosion proof lighting.
B. Ordinary electric lights
C. Propane, Gas, or kerosene lanterns
D. Special matches
Answer: A. Mirrors to direct the sunlight or explosion proof lighting.
,◉ What can happen if water-based substances are used to
extinguish electrical fires?
a. Nothing but extinguish the fire
b. The fumes are not harmful
c. Receive an electrical shock
d. They will corrode the electrical contacts
Answer: c. Receive an electrical shock
◉ When testing a manhole for explosive gases when should the first
tests be made?
a. After removing the manhole cover
b. Before removing the manhole cover
c. At any time
d. After ventilation
Answer: b. Before removing the manhole cover
◉ Atmospheric hazards encountered in manholes can include:
a. non-explosive atmospheres.
b. non-toxic atmosphere.
c. lack of oxygen.
d. non-flammable atmospheres.
Answer: c. lack of oxygen.
, ◉ When setting up to ventilate a manhole, the air inlet should be
how many feet above street level?
a. 4.0
b. 3.0
c. 2.0
d. 1.0
Answer: c. 2.0
◉ Which chemical may be used for odor control in a sewer system?
a. Calcium chloride
b. Hydrogen peroxide
c. Oxidized aluminum
d. Sodium chloride
Answer: b. Hydrogen peroxide
◉ What information must be on a warning tag attached to a switch
that has been locked out?
a. Directions for removing tag.
b. Name of nearest physician to call in case of emergency.
c. Signature of person who locked out switch and who is the only
person authorized to remove tag.
