11776329
Descripción
Test por Dean Lampman, actualizado hace más de 1 año
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Creado por Dean Lampman
hace casi 7 años
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Pregunta 1
Pregunta
What Is not run on raw influent wastewater?
Respuesta
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CBOD
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FECAL Coliform
-
Suspended Solids
-
pH
Pregunta 2
Pregunta
What disease is not considered to be conveyed or transmitted by untreated wastewater?
Respuesta
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Amoebic Dysentery
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Hepatitis
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Malaria
-
Cholera
Pregunta 3
Pregunta
What effect will the addition of chlorine, acid, alum. carbon dioxide, or sulfuric acid have on the pH of wastewater?
Respuesta
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Neutralize
-
Lower
-
Increase
-
Have no effect
Pregunta 4
Pregunta
Coliform bacteria are
Respuesta
-
Algae
-
Coagulant aids
-
Indicators
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Sequestering agents
Pregunta 5
Pregunta
Which of these pH readings indicates an acidic wastewater?
Respuesta
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3
-
7
-
9
-
12
Pregunta 6
Pregunta
Three waterborne diseases are
Respuesta
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Mumps, measles, colds
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Scarlet fever, pneumonia, hay fever
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Typhoid fever, dysentery, cholera
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TB, diptheria, chickenpox
Pregunta 7
Pregunta
Which one of the following conditions increase chlorine demand?
Respuesta
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Alkalinity
-
Increase in organic matter
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Increase in phosphate
-
pH increase
Pregunta 8
Pregunta
A chlorine leak can be detected by
Respuesta
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An explosimeter
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Checking the leak guage
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Spraying water on suspected leaks
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A white cloud in presence of ammonia fumes
Pregunta 9
Pregunta
Turbidity in wastewater is caused by
Respuesta
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Finely divided suspended material
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Dissolved calcium
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Hardness
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Color
Pregunta 10
Pregunta
Dark tan and shiny foam is produced when
Respuesta
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F/M ratio is too low
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Insufficient aeration tank capacity
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Young Sludge
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RAS rate inappropriate
Pregunta 11
Pregunta
The pH of wastewater
Respuesta
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Always increases as acid concentrations increase
-
Always increases when wastewater becomes septic
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is measured on a scale of 0 to 14
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is measured on a scale of 0 to 100 mg/L
Pregunta 12
Pregunta
Which of the following conditions are likely to have been caused by biological activity that is prompted by long, sluggish flow in a flat grade sewer line?
Respuesta
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Concrete and metal corrosion
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Oxygen deficiency in manholes, sewers, and wet-wells
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Toxic gas production
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All of the answers
Pregunta 13
Pregunta
Sand, silt, and grit are composed of what kind of matter?
Respuesta
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Colloidal
-
Inorganic
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Organic
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Volatile
Pregunta 14
Pregunta
Which of the following statements is NOT indicative of fresh wastewater?
Respuesta
-
Contains some dissolved oxygen from the water supply
-
is being decomposed by facultative bacteria
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is blackish in color, with rotten egg odor
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is turbid with solids in suspension
Pregunta 15
Pregunta
How much does a gallon of water weigh?
Respuesta
-
9.34 lbs
-
8.34 oz
-
7.5 lbs
-
8.34 lbs
Pregunta 16
Pregunta
Organic solids in wastewater are
Respuesta
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Generally of vegetable and animal origin
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Inert and not subject to decay
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Mostly floatable solids
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Always settleable solids
Pregunta 17
Pregunta
The purpose of primary sedimentation is to remove
Respuesta
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Pathogenic bacteria
-
Roots, rags, cans, and large debris
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Sand and gravel
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Settable and floatable material
Pregunta 18
Pregunta
One cubic foot of water contains how many gallons?
Respuesta
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2.31 gallons
-
7.48 gallons
-
8.34 gallons
-
10 gallons
Pregunta 19
Pregunta
The seepage of groundwater into sewer lines through cracks and open joints is called
Respuesta
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Inflow
-
Infiltration
-
A blessing in disguise
-
Sanitary sewage
Pregunta 20
Pregunta
The direct flow of rainwater into a sewer line through ground level openings and breaks is
Respuesta
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Inflow
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Infiltration
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Industrial sewage
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Sanitary sewage
Pregunta 21
Pregunta
_______________ is the most common and prevalent odorous gas associated with domestic wastewater collection systems.
Respuesta
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Chlorine
-
Hydrogen sulfide
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Carbon dioxide
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Methane
Pregunta 22
Pregunta
Which of the following factors could cause a demand for more DO (Increase in aeration rate) in an aeration tank?
Respuesta
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Increase in food (BOD) in the aeration tank influent
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Decrease in organic wastewater
-
Increase in influent DO
-
Increase in toxic substances
Pregunta 23
Pregunta
Chlorine is _____ times heavier than air
Respuesta
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1.5
-
2.0
-
2.5
-
3.0
Pregunta 24
Pregunta
The liquid to gas expansion ration of chlorine is
Respuesta
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25 to 1
-
250 to 1
-
460 to 1
-
500 to 1
Pregunta 25
Pregunta
Gaseous chlorine is a
Respuesta
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Clear colorless gas
-
White fog-like gas
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Greenish-yellow gas
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Greyish-white gas
Pregunta 26
Pregunta
In an aerator, a white billowing foam indicates
Respuesta
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The need to increase wasting
-
The need to increase the return activated sludge rate
-
The need to decrease wasting
-
The need to stop the return activated sludge
Pregunta 27
Pregunta
In the aerator, the dissolved oxygen should be maintained at what level?
Respuesta
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2.0 mg/L
-
5.0 mg/L
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6.0 mg/L
-
8.0 mg/L
Pregunta 28
Pregunta
A low F/M ratio, high MCRT, low SVI, and high MLSS concentrations are all characteristic of
Respuesta
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A bulking sludge
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A young sludge
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An old sludge
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None of the answers
Pregunta 29
Pregunta
A Class D operator shall not be the lead/chief operator of more than ______ wastewater treatment plant(s) at any time.
Respuesta
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1
-
2
-
5
-
10
Pregunta 30
Pregunta
Where chlorine is used for basic disinfection, a total chlorine residual of at least 0.5 mg/L shall be maintained after at least _____ minutes contact time at maximum daily flow.
Respuesta
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15
-
30
-
45
-
60
Pregunta 31
Pregunta
The operator must report the FDEP any serious breakdown or malfunction within what time frame?
Respuesta
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24 hours
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48 hours
-
12 hours
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Immediately
Pregunta 32
Pregunta
The recommended storage temperature for preserving samples is
Respuesta
-
21° C
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4° C
-
60° F
-
32° F
Pregunta 33
Pregunta
Employee hazards you might encounter around a treatment facility would be
Respuesta
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Noxious or toxic gases
-
Physical injuries
-
Oxygen deficiency
-
All of the answers
Pregunta 34
Pregunta
Chlorine gas is
Respuesta
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Colorless
-
Heavier than air
-
Nontoxic
-
Odorless
Pregunta 35
Pregunta
Chlorine is primarily used to
Respuesta
-
Disinfect
-
Prevent corrosion
-
Raise pH
-
Stabilize organics
Pregunta 36
Pregunta
The exhaust fan inlet in a chlorinator room and/or chlorine storage room should be taken from
Respuesta
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Anywhere - the location is not important
-
At floor level
-
Close to the entrance
-
In the ceiling
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