ABC Wastewater Level 3 – Lab Exam Questions
With Correct Answers
To have significant meaning for laboratory tests of the evaluation of a
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wastewater treatment plant's performance the best method of
| | | | | | | |
sampling is |
A. Grab sampling
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B. Hourly sampling
| |
C. Sampling during peak flow
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D. Proportional composite sampling
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E. Automatic sampling - CORRECT ANSWER✔✔-D. Proportional
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composite sampling |
BOD samples should be collected before chlorination because
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A. Chlorine reacts with the buffer solution
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B. Chlorine interferes with the activity of organisms
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C. Chlorine reacts with the calcium ions
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D. Chlorine affects the alkalinity - CORRECT ANSWER✔✔-B. Chlorine
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interferes with the activity of organisms
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A water sample is "fixed" in the field by
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,A. Keeping the sample in a Cipolletti device
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B. Anchoring the container to the stream bed
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C. Adding chemicals to prevent the changing of water quality
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D. Maintaining a constant sample temperature of 95° F - CORRECT
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ANSWER✔✔-C. Adding chemicals to prevent the changing of water
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quality
The best procedure for determining the SS of a plant effluent is to
| | | | | | | | | | | | |
analyze
A. A 24-hr composite sample of the effluent
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B. A grab sample of the effluent at high flow
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C. A grab sample of the effluent at low flow
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D. A series of grab samples taken at different times during the day -
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CORRECT ANSWER✔✔-A. A 24-hr composite sample of the effluent
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A sample obtained by taking portions of wastewater at a collection
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point in proportion to the flow is called
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A. A most probable number (MPN)
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B. A weighted composite
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C. A routine sample
| | |
D. A bacterial-solids sample - CORRECT ANSWER✔✔-B. A weighted
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composite
, Settleable solids by volume are determined through the use of
| | | | | | | | |
A. A Nessler tube
| | |
B. A Kjeldahl flask
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C. A Gooch crucible
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D. An Imhoff cone - CORRECT ANSWER✔✔-D. An Imhoff cone
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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
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D. Determine the amount of chlorine required - CORRECT ANSWER✔✔-
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A. Measure the volume of solids that may be removed by settling tanks
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The standard total SS test requires the Gooch crucible fiber glass mat
| | | | | | | | | | | |
and solids to be dried in the oven at
| | | | | | | |
A. 95° C
| |
B. 103° C
| |
C. 110° C
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D. 115.5° C - CORRECT ANSWER✔✔-B. 103° C
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The SS content of wastewater is most accurately measured by
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With Correct Answers
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 - CORRECT ANSWER✔✔-D. Proportional
| | | | | | |
composite sampling |
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 - CORRECT ANSWER✔✔-B. Chlorine
| | | | | | | | |
interferes with the activity of organisms
| | | | |
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 - CORRECT
| | | | | | | | | | |
ANSWER✔✔-C. Adding chemicals to prevent the changing of water
| | | | | | | | |
quality
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 -
| | | | | | | | | | | | | |
CORRECT ANSWER✔✔-A. A 24-hr composite sample of the effluent
| | | | | | | |
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 - CORRECT 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 - CORRECT 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
| | | | | | | | |
D. Determine the amount of chlorine required - CORRECT ANSWER✔✔-
| | | | | | | | |
A. Measure the volume of solids that may be removed by settling tanks
| | | | | | | | | | | |
The standard total SS test requires the Gooch crucible fiber glass mat
| | | | | | | | | | | |
and solids to be dried in the oven at
| | | | | | | |
A. 95° C
| |
B. 103° C
| |
C. 110° C
| |
D. 115.5° C - CORRECT ANSWER✔✔-B. 103° C
| | | | | | |
The SS content of wastewater is most accurately measured by
| | | | | | | | |
