CWEA Collections Grade 2 Practice
Test Questions and Answers
Why are gasoline and volatile solvents objectionable when present in a sewer? -
ANSWER-They produce an explosion hazard
You should never attempt to install, troubleshoot, maintain, repair, or replace electrical
equipment unless: - ANSWER-You know what you are doing, are qualified, and are
authorized.
How many different areas of traffic zones are there when working in roadways? -
ANSWER-Five
Why should hydrogen sulfide be controlled? - ANSWER-To protect sewers and
structures from corrosion
Personnel entering a Permit Required Confined Space must have the following training:
- ANSWER-Entry and rescue procedures
To find proper protective gear before application of a product, you would: - ANSWER-
Look at the MSDS (Material Safety Data Sheet)
The gas most commonly associated with septic wastewater is: - ANSWER-Hydrogen
Sulfide (H2S)
The lack of an unpleasant odor in a structure does not always mean that dangerous
gases are not present because: - ANSWER-Some dangerous gases have no odor
What four conditions are necessary to create an explosion? - ANSWER-Combustible
gas, adequate oxygen, sufficient heat, and proper mixing of gas and oxygen.
What does "transition area" mean in traffic control? - ANSWER-Moves traffic out of its
normal path
The term "transition area" is one component of a: - ANSWER-Traffic Control Zone
What elements should be considered to improve worker safety in High Speed
Temporary Traffic Control Zones? - ANSWER-Rerouting traffic around the work site,
positioning of law enforcement officers in the temporary traffic control zone, and work
zone training.
, The main reason for adding sodium hypochlorite to sewers is to control: - ANSWER-
Odor
Roots can enter collection systems through pipe cracks, true or false? - ANSWER-True
The lowest point on the inside of a pipeline is called the: - ANSWER-Invert
How often must an excavation site and adjacent areas be inspected for hazardous
conditions? - ANSWER-Daily
Working in an un-sloped trench with no shoring is one option of Protective Shoring
Systems, true or false? - ANSWER-False. Some options are proper stopping or
benching of the sides of the excavation, supporting the sides of a trench with shoring,
and using a shield in the excavation area.
Proper operation and maintenance of wastewater collection is keeping wastewater
flowing through pipes, true or false? - ANSWER-True
Minimum design velocity for a sewer should greater than: - ANSWER-2 feet per second
Vitrified Clay pipe is a Rigid type of pipe, true or false? - ANSWER-True
Barrels, lids, cones, and backflow devices are all included in Manholes, true or false? -
ANSWER-False. All are included except for backflow devices.
Sewer testing methods include air, water, mandrill, and sewage, true or false? -
ANSWER-False. Sewer testing methods do not include sewage.
Using high velocity cleaners is one method included in hydraulic sewer cleaning, true or
false? - ANSWER-True
A flow of 650 gpm would be how many MGD? - ANSWER-650 gpm x (1440 min / 1 day)
= 936000 gpd
936000 x (1 MG / 1000000 gal) = 0.936 MGD
One of the advantages of using CCTV is that the length and severity of defective pipe
areas can be recorded, true or false? - ANSWER-True
Offset joints are one hazard that may damage a TV camera going through a sewer, true
or false? - ANSWER-True
What is the total volume of 1000 feet of 8 inch line? - ANSWER-Convert inches to feet:
8 inches x (1 foot / 12 inches) = 0.666
Volume of a right regular cylinder:
V = 0.785 x Diameter x Diameter x Length of Pipe
Test Questions and Answers
Why are gasoline and volatile solvents objectionable when present in a sewer? -
ANSWER-They produce an explosion hazard
You should never attempt to install, troubleshoot, maintain, repair, or replace electrical
equipment unless: - ANSWER-You know what you are doing, are qualified, and are
authorized.
How many different areas of traffic zones are there when working in roadways? -
ANSWER-Five
Why should hydrogen sulfide be controlled? - ANSWER-To protect sewers and
structures from corrosion
Personnel entering a Permit Required Confined Space must have the following training:
- ANSWER-Entry and rescue procedures
To find proper protective gear before application of a product, you would: - ANSWER-
Look at the MSDS (Material Safety Data Sheet)
The gas most commonly associated with septic wastewater is: - ANSWER-Hydrogen
Sulfide (H2S)
The lack of an unpleasant odor in a structure does not always mean that dangerous
gases are not present because: - ANSWER-Some dangerous gases have no odor
What four conditions are necessary to create an explosion? - ANSWER-Combustible
gas, adequate oxygen, sufficient heat, and proper mixing of gas and oxygen.
What does "transition area" mean in traffic control? - ANSWER-Moves traffic out of its
normal path
The term "transition area" is one component of a: - ANSWER-Traffic Control Zone
What elements should be considered to improve worker safety in High Speed
Temporary Traffic Control Zones? - ANSWER-Rerouting traffic around the work site,
positioning of law enforcement officers in the temporary traffic control zone, and work
zone training.
, The main reason for adding sodium hypochlorite to sewers is to control: - ANSWER-
Odor
Roots can enter collection systems through pipe cracks, true or false? - ANSWER-True
The lowest point on the inside of a pipeline is called the: - ANSWER-Invert
How often must an excavation site and adjacent areas be inspected for hazardous
conditions? - ANSWER-Daily
Working in an un-sloped trench with no shoring is one option of Protective Shoring
Systems, true or false? - ANSWER-False. Some options are proper stopping or
benching of the sides of the excavation, supporting the sides of a trench with shoring,
and using a shield in the excavation area.
Proper operation and maintenance of wastewater collection is keeping wastewater
flowing through pipes, true or false? - ANSWER-True
Minimum design velocity for a sewer should greater than: - ANSWER-2 feet per second
Vitrified Clay pipe is a Rigid type of pipe, true or false? - ANSWER-True
Barrels, lids, cones, and backflow devices are all included in Manholes, true or false? -
ANSWER-False. All are included except for backflow devices.
Sewer testing methods include air, water, mandrill, and sewage, true or false? -
ANSWER-False. Sewer testing methods do not include sewage.
Using high velocity cleaners is one method included in hydraulic sewer cleaning, true or
false? - ANSWER-True
A flow of 650 gpm would be how many MGD? - ANSWER-650 gpm x (1440 min / 1 day)
= 936000 gpd
936000 x (1 MG / 1000000 gal) = 0.936 MGD
One of the advantages of using CCTV is that the length and severity of defective pipe
areas can be recorded, true or false? - ANSWER-True
Offset joints are one hazard that may damage a TV camera going through a sewer, true
or false? - ANSWER-True
What is the total volume of 1000 feet of 8 inch line? - ANSWER-Convert inches to feet:
8 inches x (1 foot / 12 inches) = 0.666
Volume of a right regular cylinder:
V = 0.785 x Diameter x Diameter x Length of Pipe
