WATER TREATMENT GRADE 4
EXAM PREP
What is the secondary maximum contaminant level for odor?
A.) 1 TON
B.) 2 TON
C.) 3 TON
D.) 4 TON - ANSWERS-C
Which of the following may cause desorption of organics from
granular activated carbon?
A.) Decreasing flow
B.) Decreasing empty bed contact time
C.) Maintaining bed stratification
D.) Mixing the bed by overly violent washing - ANSWERS-D
In order to make surface water safe for human consumption, water is
disinfected to eliminate pathogenic bacteria and
A.) Iron and manganese
B.) Sulfide and nitrate
,C.) Giardia cysts and viruses
D.) pH and alkalinity - ANSWERS-C
Which of the following could result from corrosion in a distribution
system?
A.) Electric shock
B.) Red water problems
C.) Increase in water quality
D.) Reduction in head - ANSWERS-B
How frequently are sedimentation tanks usually drained and cleaned?
A.) Monthly
B.) When sludge equals 1/3 of basin volume
C.) Semiannually
D.) Weekly - ANSWERS-C
Granular activated carbon is used as a filter media when it is
necessary to
A.) Adsorb metals
B.) Make better use of chlorine residual
C.) Remove taste and odors
,D.) Stabilize the corrosive nature of finished water - ANSWERS-C
Which of the following is used to detect the corrosive action of
filtered water on media?
A.) Determine the total chloride
B.) Indigo test
C.) Used the MMO-MUG test
D.) Coupon test - ANSWERS-D
Unsafe chemical storage and handling practices include
A.) Separating chemicals according to hazard
B.) Labeling
C.) Protective clothing
D.) Storing all chemicals together in the same room - ANSWERS-D
What is the effect of operating a paddle wheel flocculator at a speed
that is too slow?
A.) Floc will settle out prematurely
B.) The settling efficiency will be increased
C.) The alkalinity will decrease
D.) The chlorine demand will increase - ANSWERS-A
, How should an operator immediately respond to an extremely
pungent odor of chlorine in the chlorinator room?
A.) Turn on the exhaust fan
B.) Turn off all electrical equipment in the plant
C.) Leave the room immediately
D.) Turn off the chlorine cylinder - ANSWERS-C
The rate of oxidation of iron to form insoluble ferric hydroxide is
decreased by increases in
A.) Carbon dioxide
B.) Lime dose
C.) pH
D.) Temperature - ANSWERS-A
Alum is added to raw water as a coagulant. What effect will this likely
have on the pH of the water?
A.) Increase
B.) Decrease
C.) Equalize
D.) Remain the same - ANSWERS-B
EXAM PREP
What is the secondary maximum contaminant level for odor?
A.) 1 TON
B.) 2 TON
C.) 3 TON
D.) 4 TON - ANSWERS-C
Which of the following may cause desorption of organics from
granular activated carbon?
A.) Decreasing flow
B.) Decreasing empty bed contact time
C.) Maintaining bed stratification
D.) Mixing the bed by overly violent washing - ANSWERS-D
In order to make surface water safe for human consumption, water is
disinfected to eliminate pathogenic bacteria and
A.) Iron and manganese
B.) Sulfide and nitrate
,C.) Giardia cysts and viruses
D.) pH and alkalinity - ANSWERS-C
Which of the following could result from corrosion in a distribution
system?
A.) Electric shock
B.) Red water problems
C.) Increase in water quality
D.) Reduction in head - ANSWERS-B
How frequently are sedimentation tanks usually drained and cleaned?
A.) Monthly
B.) When sludge equals 1/3 of basin volume
C.) Semiannually
D.) Weekly - ANSWERS-C
Granular activated carbon is used as a filter media when it is
necessary to
A.) Adsorb metals
B.) Make better use of chlorine residual
C.) Remove taste and odors
,D.) Stabilize the corrosive nature of finished water - ANSWERS-C
Which of the following is used to detect the corrosive action of
filtered water on media?
A.) Determine the total chloride
B.) Indigo test
C.) Used the MMO-MUG test
D.) Coupon test - ANSWERS-D
Unsafe chemical storage and handling practices include
A.) Separating chemicals according to hazard
B.) Labeling
C.) Protective clothing
D.) Storing all chemicals together in the same room - ANSWERS-D
What is the effect of operating a paddle wheel flocculator at a speed
that is too slow?
A.) Floc will settle out prematurely
B.) The settling efficiency will be increased
C.) The alkalinity will decrease
D.) The chlorine demand will increase - ANSWERS-A
, How should an operator immediately respond to an extremely
pungent odor of chlorine in the chlorinator room?
A.) Turn on the exhaust fan
B.) Turn off all electrical equipment in the plant
C.) Leave the room immediately
D.) Turn off the chlorine cylinder - ANSWERS-C
The rate of oxidation of iron to form insoluble ferric hydroxide is
decreased by increases in
A.) Carbon dioxide
B.) Lime dose
C.) pH
D.) Temperature - ANSWERS-A
Alum is added to raw water as a coagulant. What effect will this likely
have on the pH of the water?
A.) Increase
B.) Decrease
C.) Equalize
D.) Remain the same - ANSWERS-B
