Test
Class D Wastewater Sample Questions
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Preguntas del test (36)
1What Is not run on raw influent wastewater?
- ACBOD
- BFECAL Coliform
- CSuspended Solids
- DpH
2What disease is not considered to be conveyed or transmitted by untreated wastewater?
- AAmoebic Dysentery
- BHepatitis
- CMalaria
- DCholera
3What effect will the addition of chlorine, acid, alum. carbon dioxide, or sulfuric acid have on the pH of wastewater?
- ANeutralize
- BLower
- CIncrease
- DHave no effect
4Coliform bacteria are
- AAlgae
- BCoagulant aids
- CIndicators
- DSequestering agents
5Which of these pH readings indicates an acidic wastewater?
- A3
- B7
- C9
- D12
6Three waterborne diseases are
- AMumps, measles, colds
- BScarlet fever, pneumonia, hay fever
- CTyphoid fever, dysentery, cholera
- DTB, diptheria, chickenpox
7Which one of the following conditions increase chlorine demand?
- AAlkalinity
- BIncrease in organic matter
- CIncrease in phosphate
- DpH increase
8A chlorine leak can be detected by
- AAn explosimeter
- BChecking the leak guage
- CSpraying water on suspected leaks
- DA white cloud in presence of ammonia fumes
9Turbidity in wastewater is caused by
- AFinely divided suspended material
- BDissolved calcium
- CHardness
- DColor
10Dark tan and shiny foam is produced when
- AF/M ratio is too low
- BInsufficient aeration tank capacity
- CYoung Sludge
- DRAS rate inappropriate
11The pH of wastewater
- AAlways increases as acid concentrations increase
- BAlways increases when wastewater becomes septic
- Cis measured on a scale of 0 to 14
- Dis measured on a scale of 0 to 100 mg/L
12Which 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?
- AConcrete and metal corrosion
- BOxygen deficiency in manholes, sewers, and wet-wells
- CToxic gas production
- DAll of the answers
13Sand, silt, and grit are composed of what kind of matter?
- AColloidal
- BInorganic
- COrganic
- DVolatile
14Which of the following statements is NOT indicative of fresh wastewater?
- AContains some dissolved oxygen from the water supply
- Bis being decomposed by facultative bacteria
- Cis blackish in color, with rotten egg odor
- Dis turbid with solids in suspension
15How much does a gallon of water weigh?
- A9.34 lbs
- B8.34 oz
- C7.5 lbs
- D8.34 lbs
16Organic solids in wastewater are
- AGenerally of vegetable and animal origin
- BInert and not subject to decay
- CMostly floatable solids
- DAlways settleable solids
17The purpose of primary sedimentation is to remove
- APathogenic bacteria
- BRoots, rags, cans, and large debris
- CSand and gravel
- DSettable and floatable material
18One cubic foot of water contains how many gallons?
- A2.31 gallons
- B7.48 gallons
- C8.34 gallons
- D10 gallons
19The seepage of groundwater into sewer lines through cracks and open joints is called
- AInflow
- BInfiltration
- CA blessing in disguise
- DSanitary sewage
20The direct flow of rainwater into a sewer line through ground level openings and breaks is
- AInflow
- BInfiltration
- CIndustrial sewage
- DSanitary sewage
21_______________ is the most common and prevalent odorous gas associated with domestic wastewater collection systems.
- AChlorine
- BHydrogen sulfide
- CCarbon dioxide
- DMethane
22Which of the following factors could cause a demand for more DO (Increase in aeration rate) in an aeration tank?
- AIncrease in food (BOD) in the aeration tank influent
- BDecrease in organic wastewater
- CIncrease in influent DO
- DIncrease in toxic substances
23Chlorine is _____ times heavier than air
- A1.5
- B2.0
- C2.5
- D3.0
24The liquid to gas expansion ration of chlorine is
- A25 to 1
- B250 to 1
- C460 to 1
- D500 to 1
25Gaseous chlorine is a
- AClear colorless gas
- BWhite fog-like gas
- CGreenish-yellow gas
- DGreyish-white gas
26In an aerator, a white billowing foam indicates
- AThe need to increase wasting
- BThe need to increase the return activated sludge rate
- CThe need to decrease wasting
- DThe need to stop the return activated sludge
27In the aerator, the dissolved oxygen should be maintained at what level?
- A2.0 mg/L
- B5.0 mg/L
- C6.0 mg/L
- D8.0 mg/L
28A low F/M ratio, high MCRT, low SVI, and high MLSS concentrations are all characteristic of
- AA bulking sludge
- BA young sludge
- CAn old sludge
- DNone of the answers
29A Class D operator shall not be the lead/chief operator of more than ______ wastewater treatment plant(s) at any time.
- A1
- B2
- C5
- D10
30Where 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.
- A15
- B30
- C45
- D60
31The operator must report the FDEP any serious breakdown or malfunction within what time frame?
- A24 hours
- B48 hours
- C12 hours
- DImmediately
32The recommended storage temperature for preserving samples is
- A21° C
- B4° C
- C60° F
- D32° F
33Employee hazards you might encounter around a treatment facility would be
- ANoxious or toxic gases
- BPhysical injuries
- COxygen deficiency
- DAll of the answers
34Chlorine gas is
- AColorless
- BHeavier than air
- CNontoxic
- DOdorless
35Chlorine is primarily used to
- ADisinfect
- BPrevent corrosion
- CRaise pH
- DStabilize organics
36The exhaust fan inlet in a chlorinator room and/or chlorine storage room should be taken from
- AAnywhere - the location is not important
- BAt floor level
- CClose to the entrance
- DIn the ceiling
Información
- Descripción
- Wastewater Wastewater Treatment Study Material Test sobre Class D Wastewater Sample Questions, creado por Dean Lampman el 16/12/2017.
- Autor
- Dean Lampman
- Idioma
- English
- Visitas
- 111
- Historial
- Creado el 16 dic 2017 · actualizado el 29 jun 2021
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