WASTEWATER
COLLECTIONS III
COMPREHENSIVE EXAM
2026
◉ Velocity may be sensed
A. electrically
B. hydraulically
C. mechanically
D. all of the above. Answer: D. all of the above
◉ Hydrogen sulfide will exist in a system depending on the presence
or absence of
A. iron bacteria
B. oxygen
C. organic acids
D. inorganic sulfides. Answer: B. oxygen
◉ What would be the cause of a shorted winding in a motor?
A. overloaded
B. stalled
C. foreign material in motor
D. incorrect power. Answer: C. foreign material in motor
,◉ What should be the air gap separation between a potable water
pipe and the rim of a wastewater tank?
A. at least one pipe diameter above the rim
B. at least one and a half pipe diameters above the rim
C. at least two pipe diameters above the rim
D. at least two and a half pipe diameters above the rim. Answer: C. at
least two pipe diameters above the rim
◉ Which of the following types of fire extinguishers should be used
on electrical fires?
A. fire-resistant blanket
B. sodium bicarbonate
C. carbon dioxide
D. soda-acid. Answer: C. carbon dioxide
◉ Which one of the following provides a profile of hazardous
substances or mixtures?
A. Occupational Safety and Health Administration (OSHA) B.
Comprehensive Environmental Response, Compensation, and
Liability Act
(CERCLA)
C. Code of Federal Regulations (CFR)
,D. material safety data sheet (MSDS). Answer: D. material safety data
sheet (MSDS)
◉ An atmosphere is defined as oxygen deficient if it contains less
than what percent oxygen by volume?
A. 16.5%
B. 18.5%
C. 19.5%
D. 19.8%. Answer: C. 19.5%
◉ What class of fire involves sodium and magnesium?
A. Class A
B. Class B
C. Class C
D. Class D. Answer: D. Class D
◉ The specific gravity standard for gases is
A. water vapor at 100°C
B. air
C. oxygen
D. nitrogen. Answer: B. air
, ◉ Electrical units operating in areas exposed to flammable vapors
should
A. be removed and reinstalled in a separate room
B. be housed in a tightly sealed container
C. be double-insulated
D. be explosion-proof. Answer: D. be explosion-proof
◉ Which piece of equipment carries waste water Under pressure
from the discharge side of a pump to a point of gravity flow down
stream?
A. Trunk sewer
B. Space centrifugal pump
C. force main
D. Pumping station. Answer: C. A Force Main Carrie's wastewater
under pressure from the discharge side of a pump to a point of
gravity flow down stream.
◉ Where in the collection system are lift stations installed?
A. Less populated section of the service area
B. Space where pumping stations are too expensive
C. Low points at the end of gravity systems
COLLECTIONS III
COMPREHENSIVE EXAM
2026
◉ Velocity may be sensed
A. electrically
B. hydraulically
C. mechanically
D. all of the above. Answer: D. all of the above
◉ Hydrogen sulfide will exist in a system depending on the presence
or absence of
A. iron bacteria
B. oxygen
C. organic acids
D. inorganic sulfides. Answer: B. oxygen
◉ What would be the cause of a shorted winding in a motor?
A. overloaded
B. stalled
C. foreign material in motor
D. incorrect power. Answer: C. foreign material in motor
,◉ What should be the air gap separation between a potable water
pipe and the rim of a wastewater tank?
A. at least one pipe diameter above the rim
B. at least one and a half pipe diameters above the rim
C. at least two pipe diameters above the rim
D. at least two and a half pipe diameters above the rim. Answer: C. at
least two pipe diameters above the rim
◉ Which of the following types of fire extinguishers should be used
on electrical fires?
A. fire-resistant blanket
B. sodium bicarbonate
C. carbon dioxide
D. soda-acid. Answer: C. carbon dioxide
◉ Which one of the following provides a profile of hazardous
substances or mixtures?
A. Occupational Safety and Health Administration (OSHA) B.
Comprehensive Environmental Response, Compensation, and
Liability Act
(CERCLA)
C. Code of Federal Regulations (CFR)
,D. material safety data sheet (MSDS). Answer: D. material safety data
sheet (MSDS)
◉ An atmosphere is defined as oxygen deficient if it contains less
than what percent oxygen by volume?
A. 16.5%
B. 18.5%
C. 19.5%
D. 19.8%. Answer: C. 19.5%
◉ What class of fire involves sodium and magnesium?
A. Class A
B. Class B
C. Class C
D. Class D. Answer: D. Class D
◉ The specific gravity standard for gases is
A. water vapor at 100°C
B. air
C. oxygen
D. nitrogen. Answer: B. air
, ◉ Electrical units operating in areas exposed to flammable vapors
should
A. be removed and reinstalled in a separate room
B. be housed in a tightly sealed container
C. be double-insulated
D. be explosion-proof. Answer: D. be explosion-proof
◉ Which piece of equipment carries waste water Under pressure
from the discharge side of a pump to a point of gravity flow down
stream?
A. Trunk sewer
B. Space centrifugal pump
C. force main
D. Pumping station. Answer: C. A Force Main Carrie's wastewater
under pressure from the discharge side of a pump to a point of
gravity flow down stream.
◉ Where in the collection system are lift stations installed?
A. Less populated section of the service area
B. Space where pumping stations are too expensive
C. Low points at the end of gravity systems
