ABC Wastewater Level 3 Certification
Exam Study Guide (Frequently Tested
Questions with Verified Answers) |
Latest Edition
1. To have significant meaning for laboratory tests of the evaluation of a
wastewater treatment plant's performance the best method of sampling is
A. Grab sampling
B. Hourly sampling
C. Sampling during peak flow
D. Proportional composite sampling
E. Automatic sampling - ANSWER D. Proportional composite sampling
2. BOD samples should be collected before chlorination because
A. Chlorine reacts with the buffer solution
B. Chlorine interferes with the activity of organisms
C. Chlorine reacts with the calcium ions
D. Chlorine affects the alkalinity - ANSWER B. Chlorine interferes with
the activity of organisms
3. The SS content of wastewater is most accurately measured by
A. Filtering the sample through a specially prepared filter; drying the
filter and material retained on it in an oven at 103° C; weighing the
filter; and determining its added weight caused by the solids retained
B. Evaporating the sample and weighing the residue
C. Centrifuging the sample and measuring the volume of solids separated
from the liquid
D. Distilling the sample after acidification with sulfuric acid and titrating
the distillate with N sodium hydroxide - ANSWER A. Filtering the
sample through a specially prepared filter; drying the filter and
, material retained on it in an oven at 103° C; weighing the filter; and
determining its added weight caused by the solids retained
4. The amount of sample to be used in determining SS depends on the
A. Amount of grease in the sample
B. Amount of SS in the sample
C. Degree of turbidity of the sample
D. Type of vacuum apparatus available - ANSWER B. Amount of SS in
the sample
5. The advantage of the centrifuge test for SS determination in comparison
with the other method is
A. Accuracy of results
B. Large volume of sample it can handle
C. Low cost
D. Speed of answer - ANSWER D. Speed of answer
6. The following indicator is most useful in determining pH values near
neutrality:
A. Bromthymol blue
B. Bromcresol green
C. Methyl orange
D. Thymol blue - ANSWER A. Bromthymol blue
7. If a sample of sludge is taken from a digester and allowed to stand for an
hour before a pH determination is made, the result will be
A. An increase in oxygen content
B. A decrease in pH
C. An increase in pH
D. None of the above - ANSWER B. A decrease in pH
8. Buffer capacity in water is a measure of
, A. Ability to resist change in pH
B. Ability to hold settleable solids
C. Saturation DO
D. Ability to treat fluctuating BOD load - ANSWER A. Ability to resist
change in pH
9. The pH's of 6 grab samples were: 6.0, 7.5, 6.9. 5.2, 8.9 and 8.5. From this,
we may determine that the pH of the composite sample was
A. 4.2
B. 8.9
C. 7.0
D. Cannot be determined from the above data - ANSWER D. Cannot be
determined from the above data
10.The amperometric titration method is used to measure
A. BOD.
B. pH.
C. Residual chlorine
D. Total coliform - ANSWER C. Residual chlorine
11.A chlorine demand test for various time periods on plant effluent samples
will show
A. The safe amount of chlorine that may be fed without killing fish
B. The number of pounds of chlorine required to kill 100 percent of the
coliform
C. The amount of chlorine required to give a desired residual after a
given time
D. The amount of chlorine required to reduce the BOD to 10 mg/l in the
effluent - ANSWER C. The amount of chlorine required to give a
desired residual after a given time
12.A water sample is "fixed" in the field by
A. Keeping the sample in a Cipolletti device
, B. Anchoring the container to the stream bed
C. Adding chemicals to prevent the changing of water quality
D. Maintaining a constant sample temperature of 95° F - ANSWER C.
Adding chemicals to prevent the changing of water quality
13.The best procedure for determining the SS of a plant effluent is to analyze
A. A 24-hr composite sample of the effluent
B. A grab sample of the effluent at high flow
C. A grab sample of the effluent at low flow
D. A series of grab samples taken at different times during the day -
ANSWER A. A 24-hr composite sample of the effluent
14.A sample obtained by taking portions of wastewater at a collection point in
proportion to the flow is called
A. A most probable number (MPN)
B. A weighted composite
C. A routine sample
D. A bacterial-solids sample - ANSWER B. A weighted composite
Settleable solids by volume are determined through the use of
A. A Nessler tube
B. A Kjeldahl flask
C. A Gooch crucible
D. An Imhoff cone - ANSWER D. An Imhoff cone
The settleable solids test is primarily used to
A. Measure the volume of solids that may be removed by settling tanks
B. Determine the BOD required for treatment
C. Measure the rate of decomposition of organic volatile solids
Exam Study Guide (Frequently Tested
Questions with Verified Answers) |
Latest Edition
1. To have significant meaning for laboratory tests of the evaluation of a
wastewater treatment plant's performance the best method of sampling is
A. Grab sampling
B. Hourly sampling
C. Sampling during peak flow
D. Proportional composite sampling
E. Automatic sampling - ANSWER D. Proportional composite sampling
2. BOD samples should be collected before chlorination because
A. Chlorine reacts with the buffer solution
B. Chlorine interferes with the activity of organisms
C. Chlorine reacts with the calcium ions
D. Chlorine affects the alkalinity - ANSWER B. Chlorine interferes with
the activity of organisms
3. The SS content of wastewater is most accurately measured by
A. Filtering the sample through a specially prepared filter; drying the
filter and material retained on it in an oven at 103° C; weighing the
filter; and determining its added weight caused by the solids retained
B. Evaporating the sample and weighing the residue
C. Centrifuging the sample and measuring the volume of solids separated
from the liquid
D. Distilling the sample after acidification with sulfuric acid and titrating
the distillate with N sodium hydroxide - ANSWER A. Filtering the
sample through a specially prepared filter; drying the filter and
, material retained on it in an oven at 103° C; weighing the filter; and
determining its added weight caused by the solids retained
4. The amount of sample to be used in determining SS depends on the
A. Amount of grease in the sample
B. Amount of SS in the sample
C. Degree of turbidity of the sample
D. Type of vacuum apparatus available - ANSWER B. Amount of SS in
the sample
5. The advantage of the centrifuge test for SS determination in comparison
with the other method is
A. Accuracy of results
B. Large volume of sample it can handle
C. Low cost
D. Speed of answer - ANSWER D. Speed of answer
6. The following indicator is most useful in determining pH values near
neutrality:
A. Bromthymol blue
B. Bromcresol green
C. Methyl orange
D. Thymol blue - ANSWER A. Bromthymol blue
7. If a sample of sludge is taken from a digester and allowed to stand for an
hour before a pH determination is made, the result will be
A. An increase in oxygen content
B. A decrease in pH
C. An increase in pH
D. None of the above - ANSWER B. A decrease in pH
8. Buffer capacity in water is a measure of
, A. Ability to resist change in pH
B. Ability to hold settleable solids
C. Saturation DO
D. Ability to treat fluctuating BOD load - ANSWER A. Ability to resist
change in pH
9. The pH's of 6 grab samples were: 6.0, 7.5, 6.9. 5.2, 8.9 and 8.5. From this,
we may determine that the pH of the composite sample was
A. 4.2
B. 8.9
C. 7.0
D. Cannot be determined from the above data - ANSWER D. Cannot be
determined from the above data
10.The amperometric titration method is used to measure
A. BOD.
B. pH.
C. Residual chlorine
D. Total coliform - ANSWER C. Residual chlorine
11.A chlorine demand test for various time periods on plant effluent samples
will show
A. The safe amount of chlorine that may be fed without killing fish
B. The number of pounds of chlorine required to kill 100 percent of the
coliform
C. The amount of chlorine required to give a desired residual after a
given time
D. The amount of chlorine required to reduce the BOD to 10 mg/l in the
effluent - ANSWER C. The amount of chlorine required to give a
desired residual after a given time
12.A water sample is "fixed" in the field by
A. Keeping the sample in a Cipolletti device
, B. Anchoring the container to the stream bed
C. Adding chemicals to prevent the changing of water quality
D. Maintaining a constant sample temperature of 95° F - ANSWER C.
Adding chemicals to prevent the changing of water quality
13.The best procedure for determining the SS of a plant effluent is to analyze
A. A 24-hr composite sample of the effluent
B. A grab sample of the effluent at high flow
C. A grab sample of the effluent at low flow
D. A series of grab samples taken at different times during the day -
ANSWER A. A 24-hr composite sample of the effluent
14.A sample obtained by taking portions of wastewater at a collection point in
proportion to the flow is called
A. A most probable number (MPN)
B. A weighted composite
C. A routine sample
D. A bacterial-solids sample - ANSWER B. A weighted composite
Settleable solids by volume are determined through the use of
A. A Nessler tube
B. A Kjeldahl flask
C. A Gooch crucible
D. An Imhoff cone - ANSWER D. An Imhoff cone
The settleable solids test is primarily used to
A. Measure the volume of solids that may be removed by settling tanks
B. Determine the BOD required for treatment
C. Measure the rate of decomposition of organic volatile solids
