CWEA Collections Grade 2 Practice
Test-Graded A
Why are gasoline and volatile solvents objectionable when present in a sewer? - ANS-
They produce an explosion hazard
You should never attempt to install, troubleshoot, maintain, repair, or replace electrical
equipment unless: - ANS-You know what you are doing, are qualified, and are
authorized.
How many different areas of traffic zones are there when working in roadways? - ANS-
Five
Why should hydrogen sulfide be controlled? - ANS-To protect sewers and structures
from corrosion
Personnel entering a Permit Required Confined Space must have the following training:
- ANS-Entry and rescue procedures
To find proper protective gear before application of a product, you would: - ANS-Look at
the MSDS (Material Safety Data Sheet)
The gas most commonly associated with septic wastewater is: - ANS-Hydrogen Sulfide
(H2S)
The lack of an unpleasant odor in a structure does not always mean that dangerous
gases are not present because: - ANS-Some dangerous gases have no odor
What is the first thing to consider when selecting a solution to clear a stoppage in a
sewer? - ANS-Cause of stoppage
The interior of 300 feet of 12-inch pipe is uniformly coated with one inch of grease. How
many gallons will this pipe hold when filled with water? - ANS-12 inches (diameter of
pipe) - 2 inches (grease on pipe) = 10 inches
Convert inches to feet:
10 inches x (1 foot / 12 inches) = 0.833 feet
Volume of a right regular cylinder:
V = 0.785 x Diameter x Diameter x Length of Pipe
V = 0.785 x 0.833 ft x 0.833 ft x 300 ft
V = 163.41 cubic feet
Convert to Gallons:
, 163.41 cu ft x (7.48 gal / 1 cu ft) = 1223.31 gal
Infiltration can be caused by cracked pipes, true or false? - ANS-True
The main reason for adding sodium hypochlorite to sewers is to control: - ANS-Odor
Roots can enter collection systems through pipe cracks, true or false? - ANS-True
The lowest point on the inside of a pipeline is called the: - ANS-Invert
How often must an excavation site and adjacent areas be inspected for hazardous
conditions? - ANS-Daily
Working in an un-sloped trench with no shoring is one option of Protective Shoring
Systems, true or false? - ANS-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? - ANS-True
Minimum design velocity for a sewer should greater than: - ANS-2 feet per second
Vitrified Clay pipe is a Rigid type of pipe, true or false? - ANS-True
Barrels, lids, cones, and backflow devices are all included in Manholes, true or false? -
ANS-False. All are included except for backflow devices.
Sewer testing methods include air, water, mandrill, and sewage, true or false? - ANS-
False. Sewer testing methods do not include sewage.
Using high velocity cleaners is one method included in hydraulic sewer cleaning, true or
false? - ANS-True
A flow of 650 gpm would be how many MGD? - ANS-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? - ANS-True
Offset joints are one hazard that may damage a TV camera going through a sewer, true
or false? - ANS-True
What is the total volume of 1000 feet of 8 inch line? - ANS-Convert inches to feet:
8 inches x (1 foot / 12 inches) = 0.666
Test-Graded A
Why are gasoline and volatile solvents objectionable when present in a sewer? - ANS-
They produce an explosion hazard
You should never attempt to install, troubleshoot, maintain, repair, or replace electrical
equipment unless: - ANS-You know what you are doing, are qualified, and are
authorized.
How many different areas of traffic zones are there when working in roadways? - ANS-
Five
Why should hydrogen sulfide be controlled? - ANS-To protect sewers and structures
from corrosion
Personnel entering a Permit Required Confined Space must have the following training:
- ANS-Entry and rescue procedures
To find proper protective gear before application of a product, you would: - ANS-Look at
the MSDS (Material Safety Data Sheet)
The gas most commonly associated with septic wastewater is: - ANS-Hydrogen Sulfide
(H2S)
The lack of an unpleasant odor in a structure does not always mean that dangerous
gases are not present because: - ANS-Some dangerous gases have no odor
What is the first thing to consider when selecting a solution to clear a stoppage in a
sewer? - ANS-Cause of stoppage
The interior of 300 feet of 12-inch pipe is uniformly coated with one inch of grease. How
many gallons will this pipe hold when filled with water? - ANS-12 inches (diameter of
pipe) - 2 inches (grease on pipe) = 10 inches
Convert inches to feet:
10 inches x (1 foot / 12 inches) = 0.833 feet
Volume of a right regular cylinder:
V = 0.785 x Diameter x Diameter x Length of Pipe
V = 0.785 x 0.833 ft x 0.833 ft x 300 ft
V = 163.41 cubic feet
Convert to Gallons:
, 163.41 cu ft x (7.48 gal / 1 cu ft) = 1223.31 gal
Infiltration can be caused by cracked pipes, true or false? - ANS-True
The main reason for adding sodium hypochlorite to sewers is to control: - ANS-Odor
Roots can enter collection systems through pipe cracks, true or false? - ANS-True
The lowest point on the inside of a pipeline is called the: - ANS-Invert
How often must an excavation site and adjacent areas be inspected for hazardous
conditions? - ANS-Daily
Working in an un-sloped trench with no shoring is one option of Protective Shoring
Systems, true or false? - ANS-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? - ANS-True
Minimum design velocity for a sewer should greater than: - ANS-2 feet per second
Vitrified Clay pipe is a Rigid type of pipe, true or false? - ANS-True
Barrels, lids, cones, and backflow devices are all included in Manholes, true or false? -
ANS-False. All are included except for backflow devices.
Sewer testing methods include air, water, mandrill, and sewage, true or false? - ANS-
False. Sewer testing methods do not include sewage.
Using high velocity cleaners is one method included in hydraulic sewer cleaning, true or
false? - ANS-True
A flow of 650 gpm would be how many MGD? - ANS-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? - ANS-True
Offset joints are one hazard that may damage a TV camera going through a sewer, true
or false? - ANS-True
What is the total volume of 1000 feet of 8 inch line? - ANS-Convert inches to feet:
8 inches x (1 foot / 12 inches) = 0.666
