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Class D Wastewater Sample Questions

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Wastewater Wastewater Treatment Study Material Quiz on Class D Wastewater Sample Questions, created by Dean Lampman on 16/12/2017.
Dean Lampman
Quiz by Dean Lampman, updated more than 1 year ago
Dean Lampman
Created by Dean Lampman over 7 years ago
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Resource summary

Question 1

Question
What Is not run on raw influent wastewater?
Answer
  • CBOD
  • FECAL Coliform
  • Suspended Solids
  • pH

Question 2

Question
What disease is not considered to be conveyed or transmitted by untreated wastewater?
Answer
  • Amoebic Dysentery
  • Hepatitis
  • Malaria
  • Cholera

Question 3

Question
What effect will the addition of chlorine, acid, alum. carbon dioxide, or sulfuric acid have on the pH of wastewater?
Answer
  • Neutralize
  • Lower
  • Increase
  • Have no effect

Question 4

Question
Coliform bacteria are
Answer
  • Algae
  • Coagulant aids
  • Indicators
  • Sequestering agents

Question 5

Question
Which of these pH readings indicates an acidic wastewater?
Answer
  • 3
  • 7
  • 9
  • 12

Question 6

Question
Three waterborne diseases are
Answer
  • Mumps, measles, colds
  • Scarlet fever, pneumonia, hay fever
  • Typhoid fever, dysentery, cholera
  • TB, diptheria, chickenpox

Question 7

Question
Which one of the following conditions increase chlorine demand?
Answer
  • Alkalinity
  • Increase in organic matter
  • Increase in phosphate
  • pH increase

Question 8

Question
A chlorine leak can be detected by
Answer
  • An explosimeter
  • Checking the leak guage
  • Spraying water on suspected leaks
  • A white cloud in presence of ammonia fumes

Question 9

Question
Turbidity in wastewater is caused by
Answer
  • Finely divided suspended material
  • Dissolved calcium
  • Hardness
  • Color

Question 10

Question
Dark tan and shiny foam is produced when
Answer
  • F/M ratio is too low
  • Insufficient aeration tank capacity
  • Young Sludge
  • RAS rate inappropriate

Question 11

Question
The pH of wastewater
Answer
  • Always increases as acid concentrations increase
  • Always increases when wastewater becomes septic
  • is measured on a scale of 0 to 14
  • is measured on a scale of 0 to 100 mg/L

Question 12

Question
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?
Answer
  • Concrete and metal corrosion
  • Oxygen deficiency in manholes, sewers, and wet-wells
  • Toxic gas production
  • All of the answers

Question 13

Question
Sand, silt, and grit are composed of what kind of matter?
Answer
  • Colloidal
  • Inorganic
  • Organic
  • Volatile

Question 14

Question
Which of the following statements is NOT indicative of fresh wastewater?
Answer
  • Contains some dissolved oxygen from the water supply
  • is being decomposed by facultative bacteria
  • is blackish in color, with rotten egg odor
  • is turbid with solids in suspension

Question 15

Question
How much does a gallon of water weigh?
Answer
  • 9.34 lbs
  • 8.34 oz
  • 7.5 lbs
  • 8.34 lbs

Question 16

Question
Organic solids in wastewater are
Answer
  • Generally of vegetable and animal origin
  • Inert and not subject to decay
  • Mostly floatable solids
  • Always settleable solids

Question 17

Question
The purpose of primary sedimentation is to remove
Answer
  • Pathogenic bacteria
  • Roots, rags, cans, and large debris
  • Sand and gravel
  • Settable and floatable material

Question 18

Question
One cubic foot of water contains how many gallons?
Answer
  • 2.31 gallons
  • 7.48 gallons
  • 8.34 gallons
  • 10 gallons

Question 19

Question
The seepage of groundwater into sewer lines through cracks and open joints is called
Answer
  • Inflow
  • Infiltration
  • A blessing in disguise
  • Sanitary sewage

Question 20

Question
The direct flow of rainwater into a sewer line through ground level openings and breaks is
Answer
  • Inflow
  • Infiltration
  • Industrial sewage
  • Sanitary sewage

Question 21

Question
_______________ is the most common and prevalent odorous gas associated with domestic wastewater collection systems.
Answer
  • Chlorine
  • Hydrogen sulfide
  • Carbon dioxide
  • Methane

Question 22

Question
Which of the following factors could cause a demand for more DO (Increase in aeration rate) in an aeration tank?
Answer
  • Increase in food (BOD) in the aeration tank influent
  • Decrease in organic wastewater
  • Increase in influent DO
  • Increase in toxic substances

Question 23

Question
Chlorine is _____ times heavier than air
Answer
  • 1.5
  • 2.0
  • 2.5
  • 3.0

Question 24

Question
The liquid to gas expansion ration of chlorine is
Answer
  • 25 to 1
  • 250 to 1
  • 460 to 1
  • 500 to 1

Question 25

Question
Gaseous chlorine is a
Answer
  • Clear colorless gas
  • White fog-like gas
  • Greenish-yellow gas
  • Greyish-white gas

Question 26

Question
In an aerator, a white billowing foam indicates
Answer
  • 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

Question 27

Question
In the aerator, the dissolved oxygen should be maintained at what level?
Answer
  • 2.0 mg/L
  • 5.0 mg/L
  • 6.0 mg/L
  • 8.0 mg/L

Question 28

Question
A low F/M ratio, high MCRT, low SVI, and high MLSS concentrations are all characteristic of
Answer
  • A bulking sludge
  • A young sludge
  • An old sludge
  • None of the answers

Question 29

Question
A Class D operator shall not be the lead/chief operator of more than ______ wastewater treatment plant(s) at any time.
Answer
  • 1
  • 2
  • 5
  • 10

Question 30

Question
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.
Answer
  • 15
  • 30
  • 45
  • 60

Question 31

Question
The operator must report the FDEP any serious breakdown or malfunction within what time frame?
Answer
  • 24 hours
  • 48 hours
  • 12 hours
  • Immediately

Question 32

Question
The recommended storage temperature for preserving samples is
Answer
  • 21° C
  • 4° C
  • 60° F
  • 32° F

Question 33

Question
Employee hazards you might encounter around a treatment facility would be
Answer
  • Noxious or toxic gases
  • Physical injuries
  • Oxygen deficiency
  • All of the answers

Question 34

Question
Chlorine gas is
Answer
  • Colorless
  • Heavier than air
  • Nontoxic
  • Odorless

Question 35

Question
Chlorine is primarily used to
Answer
  • Disinfect
  • Prevent corrosion
  • Raise pH
  • Stabilize organics

Question 36

Question
The exhaust fan inlet in a chlorinator room and/or chlorine storage room should be taken from
Answer
  • Anywhere - the location is not important
  • At floor level
  • Close to the entrance
  • In the ceiling
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