CWEA Collection Systems Maintenance Exam (Latest
2026/2027) Comprehensive Practice Questions with
Verified Answers 100% Correct Grade A
# SECTION 1: SAFETY PROCEDURES
Question 1
Why are gasoline and volatile solvents objectionable when present in a sewer?
A) They cause corrosion
B) They produce an explosion hazard
C) They create odors
D) They damage pipes
Correct Answer: B
Rationale: Gasoline and volatile solvents produce flammable vapors that can create
an explosion hazard in sewer systems. Their presence is a serious safety concern .
Question 2
You should never attempt to install, maintain, repair, or replace electrical
equipment panels, controls, wiring, or circuits unless:
1
,A) You have permission from your supervisor
B) You know what you are doing, are qualified, and are authorized
C) You have read the manual
D) There is a witness present
Correct Answer: B
Rationale: Only qualified and authorized personnel with proper knowledge should
work on electrical equipment. This is a fundamental safety requirement .
Question 3
What does L.O.T.O. stand for?
A) Lock Out Tag Out
B) Load Operated Turn Off
C) Local Operating Time Out
D) Lower Oxygen Transfer Output
Correct Answer: A
Rationale: Lock Out Tag Out is a critical safety procedure for isolating energy
sources during maintenance. The LO/TO program ensures equipment is de-
energized before work begins .
2
,Question 4
When developing an S.O.P. for scheduled maintenance of electrical equipment,
what program should be addressed as a primary safety guideline?
A) The L.O.T.O Program
B) The MSDS Program
C) The HAZCOM Program
D) The Emergency Response Program
Correct Answer: A
Rationale: The Lock Out Tag Out program is essential for electrical maintenance
safety to prevent accidental energization of equipment .
Question 5
The oxygen level alarm normally goes off if oxygen levels are below:
A) 19.5 percent
B) 21 percent
C) 18 percent
D) 20 percent
Correct Answer: A
3
, Rationale: OSHA standards require oxygen levels to be between 19.5% and 23.5%
for safe entry. An alarm sounds below 19.5% .
Question 6
What does "LEL" mean on a gas detection meter?
A) Lower Explosive Limit
B) Low Energy Level
C) Lethal Exposure Limit
D) Legal Environmental Level
Correct Answer: A
Rationale: LEL stands for Lower Explosive Limit, the lowest concentration of a
gas that can ignite in air. This is critical for confined space entry safety .
Question 7
Personnel entering a Permit Required Confined Space must have which training?
A) Entry and rescue
B) First aid only
C) Equipment operation
D) Record keeping
4
2026/2027) Comprehensive Practice Questions with
Verified Answers 100% Correct Grade A
# SECTION 1: SAFETY PROCEDURES
Question 1
Why are gasoline and volatile solvents objectionable when present in a sewer?
A) They cause corrosion
B) They produce an explosion hazard
C) They create odors
D) They damage pipes
Correct Answer: B
Rationale: Gasoline and volatile solvents produce flammable vapors that can create
an explosion hazard in sewer systems. Their presence is a serious safety concern .
Question 2
You should never attempt to install, maintain, repair, or replace electrical
equipment panels, controls, wiring, or circuits unless:
1
,A) You have permission from your supervisor
B) You know what you are doing, are qualified, and are authorized
C) You have read the manual
D) There is a witness present
Correct Answer: B
Rationale: Only qualified and authorized personnel with proper knowledge should
work on electrical equipment. This is a fundamental safety requirement .
Question 3
What does L.O.T.O. stand for?
A) Lock Out Tag Out
B) Load Operated Turn Off
C) Local Operating Time Out
D) Lower Oxygen Transfer Output
Correct Answer: A
Rationale: Lock Out Tag Out is a critical safety procedure for isolating energy
sources during maintenance. The LO/TO program ensures equipment is de-
energized before work begins .
2
,Question 4
When developing an S.O.P. for scheduled maintenance of electrical equipment,
what program should be addressed as a primary safety guideline?
A) The L.O.T.O Program
B) The MSDS Program
C) The HAZCOM Program
D) The Emergency Response Program
Correct Answer: A
Rationale: The Lock Out Tag Out program is essential for electrical maintenance
safety to prevent accidental energization of equipment .
Question 5
The oxygen level alarm normally goes off if oxygen levels are below:
A) 19.5 percent
B) 21 percent
C) 18 percent
D) 20 percent
Correct Answer: A
3
, Rationale: OSHA standards require oxygen levels to be between 19.5% and 23.5%
for safe entry. An alarm sounds below 19.5% .
Question 6
What does "LEL" mean on a gas detection meter?
A) Lower Explosive Limit
B) Low Energy Level
C) Lethal Exposure Limit
D) Legal Environmental Level
Correct Answer: A
Rationale: LEL stands for Lower Explosive Limit, the lowest concentration of a
gas that can ignite in air. This is critical for confined space entry safety .
Question 7
Personnel entering a Permit Required Confined Space must have which training?
A) Entry and rescue
B) First aid only
C) Equipment operation
D) Record keeping
4
