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This 5 question practice test is a demo of the full, 100 question, practice test available to members. The full practice test is randomly generated from a database of hundreds of questions, meaning no two test are ever exactly the same.
This test is designed to simulate the actual Wastewater exam as closely as possible. These questions are similar to, but not the same as, the questions you are likely to encounter on your certification exam.
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Question 1 of 5
1. Question
When organic wastes are discharged to receiving water, oxygen is depleted by
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Question 2 of 5
2. Question
Which of the following groups of microorganisms are found in a good settling mixed liquor?
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Question 3 of 5
3. Question
The purpose of adding sodium thiosulfate to a microbiological sample bottle is to
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Question 4 of 5
4. Question
Under which of the following conditions should sludge wasting normally be increased?
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Question 5 of 5
5. Question
Determine the percentage volatile suspended solids of a sample given the following data.
Weight of dish = 21.03 grams Weight of dish + wet sample = 54.12 grams Weight of dish + dry sample = 22.60 grams Weight of dish + ash = 21.75 grams
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Formulas: VS, % = Dry solids wt. g – Ash wt. g x 100 Dry solids wt. g VS, % = (22.60 g – 21.03 g) – (21.75 g – 21.03 g) x 100 22.60 g – 21.03 g = 1.57 – 0.72 x 100 1.57 = 0.85 x 100 1.57 = 0.54 x 100 = 54%Incorrect
Formulas: VS, % = Dry solids wt. g – Ash wt. g x 100 Dry solids wt. g VS, % = (22.60 g – 21.03 g) – (21.75 g – 21.03 g) x 100 22.60 g – 21.03 g = 1.57 – 0.72 x 100 1.57 = 0.85 x 100 1.57 = 0.54 x 100 = 54%Hint
VS, % = Dry solids wt. g – Ash wt. g x 100 Dry solids wt. g