Exam (elaborations)
Alabama Wastewater Collection Grade 1 C
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Alabama Wastewater Collection Grade 1 C
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Alabama Wastewater Collection Grade 1 C_______________ is a disease which can be caused by the
ingestion of wastewater
a. Influenza
b. Tetanus
c. Typhoid
d. Legionnaire's disease - ANSWER-c. Typhoid
.
To minimize the danger of coming in contact with infectious diseases, you should
a. Wear your work clothes home.
b. Always wash your hands after any potential contact
with wastewater.
c. Never wear protective clothing when you will come
in contact with wastewater.
d. Never repair equipment that comes in contact
with wastewater solids. - ANSWER-b. Always wash your hands after any potential
contact with wastewater.
"Peak flow" refers to?
a. Highest BOD level
b. The most corrosive period of flow
c. Highest flow during a certain period
d. The design flow of the sewer - ANSWER-c. Highest flow during a certain period
1 cubic foot of water =
a. 1.0 gallons
b. 3.75 gallons
c. 7.48 gallons
d. 10.0 gallons - ANSWER-c. 7.48 gallons
1 cubic foot of water =
a. 1.05 pound
b. 4.52 pounds
c. 8.34 pounds
d. 10.00 pounds - ANSWER-c. 8.34 pounds
6. Chlorine gas is
,a. Lighter than air.
b. Heavier than air. - ANSWER-b. Heavier than air.
A _______ gasket should always be used on liquid chlorine lines to prevent leaks of this
dangerous gas.
a. Lead.
b. Rubber.
c. Teflon.
d. Any of the above. - ANSWER-a. Lead.
A 12 in (300 mm) diameter pipe is being laid in a trench. How wide should this trench
be?
a. 1.5 ft (0.5 m)
b. 2.5 ft (0.8 m)
c. 3.5 ft (0.5 m)
d. As narrow as possible long as it does not interfere with the laying of pipe - ANSWER-
c. 3.5 ft (0.5 m)
A bell of a pipe that is chipped during installation should not be left in place because it
may cause __________
a. Infiltration
b. Exfiltration
c. Root intrusion
d. All of the above - ANSWER-d. All of the above
A briefing before manhole entry should discuss which of the following topics?
a. The job to be done.
b. Problems that might arise.
c. Safety procedures in case of an emergency.
d. All of the above. - ANSWER-d. All of the above.
A bubbler tube would most likely be found in?
a. A sewer cleaning truck
b. A manhole with little flow
c. A pump station dry well
d. A pump station wet well - ANSWER-d. A pump station wet well
A bucket machine may be used to clean a sewer that is
a. Loaded with grease
b. Plugged with roots
,c. Composed of vitrified clay and that is full of large rocks
d. On a flat grade - ANSWER-a. Loaded with grease
A centrifugal pump in a pump station is running but not pumping out the wet well. The
pump is hot. What is (are) the probable cause(s)?
a. The pump is air bound.
b. The checkvalve is stuck in the closed position.
c. The static head in the force main is greater than the discharge head of the pump.
d. All of the above. - ANSWER-d. All of the above.
A centrifugal pump operating under __________________ is capable of priming itself
without any external priming device.
a. Negative suction head.
b. Positive suction head.
c. A dynamic head.
d. A static head. - ANSWER-b. Positive suction head.
A check valve is best defined as?
a. A sluice valve
b. A valve to prevent backflow
c. A globe valve
d. A unidirectional valve - ANSWER-b. A valve to prevent backflow
A combined sewer would be best defined as?
a. A sewer intended to receive both wastewater and
storm and/or surface water
b. A sewer combined with other sewers
c. A sewer line used to collect storm water solely
d. A sewer line used to collect infiltration and inflow solely - ANSWER-a. A sewer
intended to receive both wastewater
and storm and/or surface water
A contributing cause of practically every accident is
a. Improper use of tools.
b. The lack of unity among workers.
c. Failure to give close attention to the job at hand.
d. None of the above. - ANSWER-c. Failure to give close attention to the job at hand.
A cross connection is
a. Cast Iron pipe connected to concrete pipe
, b. Steel pipe connected to asbestos pipe
c. Potable (Drinkable) water pipe connected to a supply
of questionable origin
d. Lateral line connected to an interceptor - ANSWER-c. Potable (Drinkable) water pipe
connected to a
supply of questionable origin
A cross connection is best defined as
a. Ground water entering a gravity sewer through
cracks in the piping
b. A lateral line connected to the main illegally
c. Storm drainage piped into a domestic
collection system
d. A potable water supply connected to a potential source
of pollution. - ANSWER-d. A potable water supply connected to a potential
source of pollution.
A drop manhole is?
a. A manhole where the outgoing pipe invert is higher
than the influent line
b. A manhole where the outgoing pipe invert is
significantly lower than the influent line
c. A manhole that had more than one influent pipe
d. A manhole with a sump - ANSWER-b. A manhole where the outgoing pipe invert is
significantly lower than the influent line
A drop manhole?
a. Accommodates lines at various grades
b. Dissipates velocity
c. Reduces flashing
d. All the above - ANSWER-d. All the above
A flow of 1,000,000 gpd is approximately
a. 500 gpm
b. 700 gpm
c. 1000 gpm
d. 60,000 gph - ANSWER-b. 700 gpm
( 60 min/hr * 24 hrs = 1440 min)
1,000,000 gpd / 1440 = 694
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