Water Treatment Concepts
Practice Quiz
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What is the term used to define the maximum amount of any substances allowed in water that may have an adverse effect on human health?
- Secondary Contaminant Level (SCL)
- Maximum Contaminant Level (MCL)
- Federal Contaminate Levels (FCL)
- Federal Contaminate Counts (FCC)
What is indicated in a jar test if 80% of the floc settles within 1-2 minutes after mixing has stopped?
- There is not enough coagulant
- The floc is too heavy
- Polymer dosage should be increased
- Alkalinity is beyond the solubility limit
What is the process that mixes coagulant chemicals with raw water?
- Flocculation
- Flash mixing
- Sedimentation
- Recarbonation
What is the process by which smaller flocs are gradually brought together to form larger flocs?
- Sedimentation
- Flash mixing
- Flocculation
- Clarification
What is the maximum feed rate from a 150 pound cylinder of chlorine gas?
- 20 lbs/day
- 40 lbs/day
- 80 lbs/day
- 100 lbs/day
What chemical is used with manganese greensand filters when removing iron and manganese?
- Potassium permanganate
- Ozone
- Copper sulfate
- Chlorine bisulfite
What chemical in lime softening is typically used in the removal of noncarbonated hardness?
- Sulfuric acid
- Carbon oxide
- Soda ash
- Calcium sulfate
Which Primary inorganic contaminant poses an immediate health risk?
- Arsenic
- Lead
- Turbidity
- Nitrate
What is a commonly used chemical to control algae in raw water reservoirs?
- Copper oxide
- Copper hydroxide
- Copper chloride
- Copper sulfate
What is the process of passing water through material to remove particulate and other impurities, including floc, from the water being treated?
- Filtration
- Ion exchange
- Clarification
- Sweep treatment
Which item does not determine the rate at which an instrument makes a change in the treatment process?
- Span
- Rate
- Deadband
- Race
What action is not required in the event of fluoride overfeeding?
- Shut down the equipment
- Start flushing the affected mains
- Contact the state and local health officials
- Add granular activated carbon
What may occur with an overdose of Potassium permanganate?
- The water will have a bluish color
- High THM formations
- The water will have a pinkish color
- Haloacetic acids may form
What is the most common method of killing disease causing bacteria in drinking water?
- Ozone
- U-V
- Chlorination
- Iodine
What may be added to low turbidity waters to help for a floc that will settle?
- Bentonite clay
- Lime
- Sand
- Caustic Soda
What should always be in place when moving a chlorine cylinder?
- Regulator
- Valve cover
- Rotameter
- Valve wrench
What is the name of the system that protects a steel tank from corrosion by reversing the flow of the electrical current from the water to the tank?
- Polarization reversal
- Electro Dialysis
- Cathodic protection
- Phase augmentation
What is the term used to describe a condition where oxygen is not present?
- Anaerobic
- Aerobic
- Anoxic
- Unaerobic
What is the term used to describe reversing the flow in a filter to clean the media?
- Backwashing
- Surging
- Plug flow
- Return accumulated solids (RAS)
What happens in a reservoir when the water temperature is suddenly becomes uniform throughout the reservoir?
- Reservoir turnover
- Metalimnion Exchange
- Hypolimnion reversal
- Oligotrophic turnover