Wastewater collections grade 1 CWEA questions and answers
Study guide 2026\2027 A+ Grade
What device is used during sewer excavation to protect workers an consist of portable rectangular box
open at?
A) Trench box
B) Solid sleeting
C) bucket box
D) Frame shoring
- correct answer A) Trench box
When entering a manual, ventilation shall be procured?
A) Only before entering
B) Anytime a manhole is entered
C) Only after leaving
D) only when explosive atmospheres are present
- correct answer B) Anytime a manhole is entered
What should a collection system operator know in order to troubleshoot?
A) How to correct process operator problems
B) How to correct equipment operational problems
C) How to prevent process operational problems
D) How to identify problems, causes, and potential solutions
- correct answer D) How to identify problems, causes, and potential solutions
Evidence of a chlorine leak can be detected by?
A) checking the leak gauge
,B) An explosimeter
C) Spring water on suspected leaks
D) Green or reddish deposits on material
- correct answer D) Green or reddish deposits on material
A pump that operates continuously needs to be inspected for cleanliness and leakage?
A) Daily
B) Weekly
C) Monthly
D) Yearly
- correct answer A) Daily
In a pressure sensing controller, for every foot water rises in a wet well, how much psi air will be
required to overcome the water pressure?
A) 0.433 psi per foot
B) 0.866 psi per foot
C) 7.480 psi per foot
D) 8.340 psi per foot
- correct answer A) 0.433 psi per foot
Which of the following is required for the maintenance of couplings between the driving and driven
elements?
A) Proper tuning
B) Proper Curvature
C) Proper alignment
D) Proper moisture draining
- correct answer C) Proper alignment
Check valves are used to?
A) Stop flow in both directions
B) Regulate velocity
, C) Permit flow in only one direction
D) Permit air to escape from the pipe
- correct answer C) Permit flow in only one direction
What common error in maintenance of bearings cause heat problems?
A) Lubricating the pump while it is not running
B) Overlubricating the bearings
C) Lubricating on the wrong day
D) Lubricating on the same day of the week
- correct answer B) Overlubricating the bearings
How is the rate of air from the ventilation blower normally measured?
A) Cubic feet per minute
B) Milligrams per liter
C) Feet per minute
D) Grains per gallon
- correct answer A) Cubic feet per minute
So electric motors in a facility are three phase powered with no phase protection- if one phase was
interrupted the motor would run?
A) Faster and cooler
B) Slower and heat up
C) Slower and cooler
D) Faster and heat up
- correct answer B) Slower and heat up
What is the purpose of forced draft ventilation in a lift station?
A) Remove dangerous gases
B) Prevent odors
C) Keep the air pressure equalized
Study guide 2026\2027 A+ Grade
What device is used during sewer excavation to protect workers an consist of portable rectangular box
open at?
A) Trench box
B) Solid sleeting
C) bucket box
D) Frame shoring
- correct answer A) Trench box
When entering a manual, ventilation shall be procured?
A) Only before entering
B) Anytime a manhole is entered
C) Only after leaving
D) only when explosive atmospheres are present
- correct answer B) Anytime a manhole is entered
What should a collection system operator know in order to troubleshoot?
A) How to correct process operator problems
B) How to correct equipment operational problems
C) How to prevent process operational problems
D) How to identify problems, causes, and potential solutions
- correct answer D) How to identify problems, causes, and potential solutions
Evidence of a chlorine leak can be detected by?
A) checking the leak gauge
,B) An explosimeter
C) Spring water on suspected leaks
D) Green or reddish deposits on material
- correct answer D) Green or reddish deposits on material
A pump that operates continuously needs to be inspected for cleanliness and leakage?
A) Daily
B) Weekly
C) Monthly
D) Yearly
- correct answer A) Daily
In a pressure sensing controller, for every foot water rises in a wet well, how much psi air will be
required to overcome the water pressure?
A) 0.433 psi per foot
B) 0.866 psi per foot
C) 7.480 psi per foot
D) 8.340 psi per foot
- correct answer A) 0.433 psi per foot
Which of the following is required for the maintenance of couplings between the driving and driven
elements?
A) Proper tuning
B) Proper Curvature
C) Proper alignment
D) Proper moisture draining
- correct answer C) Proper alignment
Check valves are used to?
A) Stop flow in both directions
B) Regulate velocity
, C) Permit flow in only one direction
D) Permit air to escape from the pipe
- correct answer C) Permit flow in only one direction
What common error in maintenance of bearings cause heat problems?
A) Lubricating the pump while it is not running
B) Overlubricating the bearings
C) Lubricating on the wrong day
D) Lubricating on the same day of the week
- correct answer B) Overlubricating the bearings
How is the rate of air from the ventilation blower normally measured?
A) Cubic feet per minute
B) Milligrams per liter
C) Feet per minute
D) Grains per gallon
- correct answer A) Cubic feet per minute
So electric motors in a facility are three phase powered with no phase protection- if one phase was
interrupted the motor would run?
A) Faster and cooler
B) Slower and heat up
C) Slower and cooler
D) Faster and heat up
- correct answer B) Slower and heat up
What is the purpose of forced draft ventilation in a lift station?
A) Remove dangerous gases
B) Prevent odors
C) Keep the air pressure equalized
