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28 Cards in this Set
- Front
- Back
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6-1. A heavy input of storm water into a sewage treatment plant results in what type of hydraulic problems? 1. Underloading 2. Bypassing 3. Overloading 4. Diverting
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3. Overloading
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6-2. Within a 24-hour period, the lowest flow in a sewage treatment system is between what hours? 1. 0000-0500 hours 2. 0500-1000 hours 3. 1000-1500 hours 4. 1500-2000 hours
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1. 0000-0500 hours
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6-3. What is the normal color of wastewater containing dissolved oxygen? 1. Black 2. Brown 3. Gray 4. Green
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3. Gray
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6-4. Domestic sewage should have what noticeable odor? 1. Moldy 2. Sulphurous 3. Grainy 4. Musty
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4. Musty
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6-5. What term is used to describe suspended solids that neither settle of float in wastewater? 1. Floatable solids 2. Sludge 3. Colloidal particles 4. Sedimentation
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3. Colloidal particles
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6-6. Volatile solids either burn or evaporate within what temperature range? 1. 1500°C to 1600°C 2. 1200°C to 1300°C 3. 700°C to 800°C 4. 500°C to 600°C
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4. 500°C to 600°C
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6-7. The acid or base properties of a water solution is measured in . 1. mg/1 2. ml/l 3. pH 4. DO
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3. pH
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6-8. What type of bacteria requires dissolved oxygen to remain alive? 1. Facultative 2. Anaerobic 3. Aerobic 4. Parasitic
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3. Aerobic
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6-9. A grab sample normally covers what time span, in minutes? 1) 60 2) 45 3) 30 4) 15
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4) 15
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6-10.The flow proportional composite sample normally covers what time span, in hours? 1) 48 2) 36 3) 24 4) 12
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3) 24
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6-11.Treatment plant influent water should be between what pH values? 1. 8.5 to 10 2. 6.5 to 8 3. 4 to 6 4. 2 to 4
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2. 6.5 to 8
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6-12.An Imhoff cone should be used to perform which test? 1. Dissolved oxygen 2. Activated sludge 3. Settleable solids 4. Hydrogen ion concentration
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3. Settleable solids
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6-13.When performing the BOD5 test, you should read one sample immediately and store the other at 20°C for exactly how many days? 1) 7 2) 5 3) 3 4) 2
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2) 5
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6-14.In which test should the sample be allowed to sit for 30 minutes? 1. Dissolved oxygen 2. Activated sludge 3. Settleable solids 4. Hydrogen ion concentration
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2. Activated sludge
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6-15.Which test should be used as a control test to help you decide whether to increase or decrease the rate of sludge return? 1. pH 2. MLSS 3. BOD5 4. COD
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2. MLSS
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6-16.Which test should be performed within 30 minutes of taking a sample? 1. Total suspended solids 2. Mixed liquor suspended solids 3. Chlorine residual 4. Fecal coliform
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3. Chlorine residual
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6-17.After a sample is chilled to 4°C, a fecal coliform test should be performed within how many hours? 1) 12 2) 9 3) 6 4) 3
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3) 6
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6-18.What is the cheapest operating effluent discharge method? 1. Intermittent 2. Continuous 3. Direct discharge 4. Indirect discharge
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2. Continuous
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6-19.What type of effluent discharge requires a place to store the effluent? 1. Intermittent 2. Continuous 3. Direct discharge 4. Indirect discharge
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1. Intermittent
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6-20.Vegetation around evaporation and percolation basins should not be allowed to exceed what maximum height, in inches? 1) 24 2) 20 3) 15 4) 10
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4) 10
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6-21.Trees should not be allowed to grow within how many feet of wastewater lagoons? 1. 500 2. 450 3. 200 4. 150
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1. 500
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6-22.When a septic tank discharges into a leaching field greater than 500 feet in length, you should incorporate what component(s) into the system? 1. Dosing tank only 2. Siphon only 3. Dosing tank and siphon 4. Inlet and outlet filters
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3. Dosing tank and siphon
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6-23.Regardless of size, a septic tank should be inspected at what standard intervals, in months? 1) 18 2) 12 3) 6 4) 2
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4) 2
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6-24.What is the minimum distance in feet that a shallow well can be located from a septic tank? 1) 250 2) 200 3) 150 4) 100
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4) 100
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6-25.What is the minimum distance in feet that leaching cesspools can be located from each other? 1) 40 2) 30 3) 20 4) 10
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3) 20
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6-26.What inch diameter size of perforated pipe is used in leaching fields? 1) 10 2) 8 3) 6 4) 4
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4) 4
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6-27.What is the maximum allowable length in feet of a leaching field lateral? 1) 125 2) 100 3) 75 4) 50
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2) 100
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6-28.When a leaching field becomes inoperable, you must consider what option? 1. Chemical cleaning 2. System replacement 3. Adding additional piping 4. Pumping the septic tank
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2. System replacement
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