Drinking Water Treatment Practice Exam (OHIO Class
1) – Questions & Answers
Many sources of water are directly suitable for drinking purposes without
treatment
True
False Correct Ans - False
Water treatment plant operators have the responsibility for the health and
well-being of the community they serve.
True
False Correct Ans - True
What is the purpose of coagulation-flocculation?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the
sedimentation and filtration processes.
D. To settle out larger suspended particles Correct Ans - C. To
gather together fine, light particles to form floc to aid the sedimentation
and filtration processes.
What is the purpose of filtration?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the
sedimentation and filtration processes.
D. To settle out larger suspended particles Correct Ans - B. To filter
out suspended particles
What is the main purpose of a water treatment plant's intake structure?
A. To draw in water while preventing leaves and other debris from clogging
or damaging pumps
, B. To ensure fish passage without undue harm to the fishery.
C. To provide a structure for housing the low head influent pumps.
D. To take in excess water from the raw water source Correct Ans -
A. To draw in water while preventing leaves and other debris from clogging
or damaging pumps
Smaller sized particles, such as bacteria and fine clays and silts, readily
settle out of water
True
False Correct Ans - False
Overdosing as well as underdosing of coagulants may lead to reduced
solids removal efficiency.
True
False Correct Ans - True
The maximum allowable level of turbidity in water is 0.5 NTU with a
recommended level of 0.1 NTU
True
False Correct Ans - True
What is alkalinity?
A. A laboratory procedure used to estimate the minimum or ideal coagulant
dose required to achieve certain water quality goals.
B. A process used to kill disease-causing organisms
C. A solution or liquid whose chemical make-up neutralizes acids or bases
without a great change in pH
D. The capacity of water to neutralize acids. Correct Ans - D. The
capacity of water to neutralize acids.
What is the usual culprit when there are sudden increases in filtered water
turbidity
A. Cleaning of clear well
B. Improved filter performance
1) – Questions & Answers
Many sources of water are directly suitable for drinking purposes without
treatment
True
False Correct Ans - False
Water treatment plant operators have the responsibility for the health and
well-being of the community they serve.
True
False Correct Ans - True
What is the purpose of coagulation-flocculation?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the
sedimentation and filtration processes.
D. To settle out larger suspended particles Correct Ans - C. To
gather together fine, light particles to form floc to aid the sedimentation
and filtration processes.
What is the purpose of filtration?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the
sedimentation and filtration processes.
D. To settle out larger suspended particles Correct Ans - B. To filter
out suspended particles
What is the main purpose of a water treatment plant's intake structure?
A. To draw in water while preventing leaves and other debris from clogging
or damaging pumps
, B. To ensure fish passage without undue harm to the fishery.
C. To provide a structure for housing the low head influent pumps.
D. To take in excess water from the raw water source Correct Ans -
A. To draw in water while preventing leaves and other debris from clogging
or damaging pumps
Smaller sized particles, such as bacteria and fine clays and silts, readily
settle out of water
True
False Correct Ans - False
Overdosing as well as underdosing of coagulants may lead to reduced
solids removal efficiency.
True
False Correct Ans - True
The maximum allowable level of turbidity in water is 0.5 NTU with a
recommended level of 0.1 NTU
True
False Correct Ans - True
What is alkalinity?
A. A laboratory procedure used to estimate the minimum or ideal coagulant
dose required to achieve certain water quality goals.
B. A process used to kill disease-causing organisms
C. A solution or liquid whose chemical make-up neutralizes acids or bases
without a great change in pH
D. The capacity of water to neutralize acids. Correct Ans - D. The
capacity of water to neutralize acids.
What is the usual culprit when there are sudden increases in filtered water
turbidity
A. Cleaning of clear well
B. Improved filter performance
