Joe Jorgensen
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Water Treatment Operator Certification

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Treatment 1/2 Practice Test 2

Frage 1 von 100

1

What is a pathogen?

Wähle eine der folgenden:

  • Algae

  • Laurel Tryptose

  • MTBE

  • Disease-causing microorganism

Erklärung

Frage 2 von 100

1

What is the impact of algae to water quality?

Wähle eine der folgenden:

  • Elevated hardness

  • Increase in Cryptosporidium

  • Taste and odor problems

  • Corrosively

Erklärung

Frage 3 von 100

1

What is the concentration of chlorine gas?

Wähle eine der folgenden:

  • 12.5%

  • 100%

  • 65%

  • 22.5%

Erklärung

Frage 4 von 100

1

Which of the following is not used to mix coagulants?

Wähle eine der folgenden:

  • Hydraulic mixing

  • Mechanical mixing

  • Diffuser

  • Horizontal paddle wheel

Erklärung

Frage 5 von 100

1

What is considered to be a quick remedy to address a sudden increase in filtered water turbidity?

Wähle eine der folgenden:

  • Feed a filter-aid chemical to the filter influent

  • Increase plant flowrate

  • Backwash less frequently

  • Reduce speed of rapid mixer

Erklärung

Frage 6 von 100

1

What is the likely cause of pinging in a pump?

Wähle eine der folgenden:

  • Water hardness

  • Frequent starting and stopping

  • Cavitation

  • Corrosion

Erklärung

Frage 7 von 100

1

Which of the following controls the efficiency of removing suspended solids in the sedimentation process?

Wähle eine der folgenden:

  • Minimize mud ball formation

  • Sodium hydroxide

  • Flowrate

  • Proper backwashing

Erklärung

Frage 8 von 100

1

What is a sanitary survey?

Wähle eine der folgenden:

  • Vulnerability assessment

  • An analysis to determine all potential water quality impacts to a proposed well

  • Survey conducted to find ways to reduce wastewater production

  • Investigation to determine optimal location for water sampling station

Erklärung

Frage 9 von 100

1

Which of the following categories does bacteria belong to?

Wähle eine der folgenden:

  • Dissolved

  • Settleable

  • Inorganic

  • Colloidal

Erklärung

Frage 10 von 100

1

Under the Surface Water Treatment Rule, what must the reduction of viruses be through filtration and disinfection?

Wähle eine der folgenden:

  • 99%

  • 99.99%

  • 90%

  • 95%

Erklärung

Frage 11 von 100

1

Which of the following is not considered free residual chlorine?

Wähle eine der folgenden:

  • Hypochlorous acid

  • Hyochlorite ion

  • Monochloramine

  • Chlorine

Erklärung

Frage 12 von 100

1

Why is coliform used as an indicator organism?

Wähle eine der folgenden:

  • It reduces the complexity and cost of analysis

  • It is accurate in identifying the strain of virus

  • It provides detailed information about the type of pathogens in the sample

  • It provides the exact number of pathogens in the sample

Erklärung

Frage 13 von 100

1

What is an example of a non-community, non-transient water system?

Wähle eine der folgenden:

  • Rest stop

  • Subdivision

  • Retirement community

  • School

Erklärung

Frage 14 von 100

1

What is the purpose of packing in a pump?

Wähle eine der folgenden:

  • Increase the pressure and flow of a fluid

  • Transmit input per from the driver to the impeller/s mounted on the shaft

  • Control the leakage of water along the pump shaft and prevent air from entering along the shaft when the pump is in a suction lift condition

  • Keep the shaft or rotor in correct alignment with the stationary parts under the action of radial and transverse (axial) loads

Erklärung

Frage 15 von 100

1

What does the addition of carbon dioxide do to the pH of water?

Wähle eine der folgenden:

  • Raises it

  • Lowers it

  • Unaffected by it

  • Creates instability of pH

Erklärung

Frage 16 von 100

1

What is an unconfined aquifer?

Wähle eine der folgenden:

  • One in which groundwater is under pressure by overlying and aquitards

  • A well in which water rises under pressure from a permeable stratum overlaid by impermeable rock

  • A location where groundwater naturally emerges from the Earth's subsurface in a defined flow and in an amount large enough to form a pool

  • One in which groundwater possesses a free surface open to the atmosphere

Erklärung

Frage 17 von 100

1

What is a static water level in a well?

Wähle eine der folgenden:

  • Water level when pump is not running

  • Water level when pump is running

  • The midpoint of the aquifer

  • The bottom of the zone of saturation

Erklärung

Frage 18 von 100

1

Which of the following will least likely impact the formation of flocs during the coagulation and flocculation process?

Wähle eine der folgenden:

  • Alkalinity

  • pH

  • Temperature

  • Hardness

Erklärung

Frage 19 von 100

1

What is formed when free chlorine reacts with ammonia?

Wähle eine der folgenden:

  • Ammonia hydroxide

  • Ammonia chloroform

  • Chloramine

  • Ammonium nitrate

Erklärung

Frage 20 von 100

1

Which contaminant causes Blue Baby Syndrome?

Wähle eine der folgenden:

  • Copper

  • Nitrate

  • Lead

  • Arsenic

Erklärung

Frage 21 von 100

1

What is free Chlorine?

Wähle eine der folgenden:

  • The residual chlorine existing in water in chemical combination with ammonia or organic amines

  • The sum of free and combined chlorine

  • Inorganic chloramines

  • The concentration of residual chlorine in water which is present as dissolved gas, hypochlorous acid, and or hypochlorite

Erklärung

Frage 22 von 100

1

What is a thermocline?

Wähle eine der folgenden:

  • A thin distinct layer in a reservoir in which temperature changes more rapidly with depth than it does in the layers above or below

  • Epilimnion

  • Hypolimnion

  • Deepest layer

Erklärung

Frage 23 von 100

1

What agency protects the health and safety of industrial employees?

Wähle eine der folgenden:

  • Public Utilities commission

  • EPA

  • OSHA

  • NEPA

Erklärung

Frage 24 von 100

1

What is the first priority in water treatment?

Wähle eine der folgenden:

  • Production of drinking water at a reasonable cost

  • Production of safe drinking water

  • Production of an aesthetically pleasing drinking water

  • Production of drinking water that does not leave scale deposits

Erklärung

Frage 25 von 100

1

What is the health effect of consuming water with high levels of lead?

Wähle eine der folgenden:

  • Blue Baby Syndrome

  • Breathing problems

  • Diarrhea

  • Cardiovascular effects, increased blood pressure and incidence of hypertension

Erklärung

Frage 26 von 100

1

What is an imaginary surface to which groundwater rises under hydrostatic pressure in wells or springs?

Wähle eine der folgenden:

  • Drawdown

  • Radius of influence

  • Pumping water level

  • Piezometric surface

Erklärung

Frage 27 von 100

1

What is used to evaluate new coagulants or polymers being considered for use at the plant?

Wähle eine der folgenden:

  • DPD test

  • MPN method

  • Jar test

  • Colilert method

Erklärung

Frage 28 von 100

1

What are the 4 zones of a clarifier?

Wähle eine der folgenden:

  • Inlet, Outlet, Settling, Sludge

  • Inlet, Outlet, Settling, Skimming

  • Inlet, Outlet, Settling, Baffles

  • Settling, Baffles, Skimming, Sludge

Erklärung

Frage 29 von 100

1

Which type of filtration process is approved by the Surface Water Treatment Rule?

Wähle eine der folgenden:

  • Nanofiltration

  • Conventional water treatment

  • Ion Exchange

  • Microfiltration

Erklärung

Frage 30 von 100

1

Which of the following impacts the color of source water?

Wähle eine der folgenden:

  • Sodium

  • Pressure

  • Organics, such as soil and leaves

  • Temperature

Erklärung

Frage 31 von 100

1

Coliform is most likely to be found in which of the following water supplies?

Wähle eine der folgenden:

  • Deep well

  • Shallow well

  • Artesian

  • Lake

Erklärung

Frage 32 von 100

1

What is the amount of water than can be withdrawn from an aquifer without significant environmental impact?

Wähle eine der folgenden:

  • Well drawdown

  • Safe yield

  • Cone of depression

  • Specific yield

Erklärung

Frage 33 von 100

1

pH will increase if the following chemical is added to water.

Wähle eine der folgenden:

  • CO2

  • Iron

  • Ammonia

  • Acid

Erklärung

Frage 34 von 100

1

Which of the following is an unstable form of disinfection?

Wähle eine der folgenden:

  • Ozonation

  • Sodium hypochlorite

  • Chloramine

  • UV

Erklärung

Frage 35 von 100

1

How many stages are in a breakpoint chlorination curve?

Wähle eine der folgenden:

  • 3

  • 2

  • 1

  • 4

Erklärung

Frage 36 von 100

1

Chlorine demand is best described as which of the following?

Wähle eine der folgenden:

  • Chlorine dose + Chlorine residual

  • Chlorine dose - Chlorine residual

  • Chlorine dose X Chlorine residual

  • The amount of chlorine required to linger in the pipeline

Erklärung

Frage 37 von 100

1

What is an example of a natural organic matter?

Wähle eine der folgenden:

  • Iron

  • Manganese

  • Fallen leaves

  • Arsenic

Erklärung

Frage 38 von 100

1

What is a typical characteristic of a colloidal particle in raw water?

Wähle eine der folgenden:

  • Positive charge on the surface

  • Negative charge on the surface

  • Neutral charge on the surface

  • Cationic attributes

Erklärung

Frage 39 von 100

1

What is short circuiting in a clarifier?

Wähle eine der folgenden:

  • Electrical problems in the control panel

  • Negative electrical charge on colloid

  • Electrical charge neutralized by alum

  • Shorter settling time in basin

Erklärung

Frage 40 von 100

1

What would cause a filter to begin backwashing?

Wähle eine der folgenden:

  • Low chlorine concentration

  • Presence of THM

  • Head loss

  • Temperature

Erklärung

Frage 41 von 100

1

What is the purpose of surface washing in a filtration unit?

Wähle eine der folgenden:

  • Clear under drain

  • Expand filter media

  • Prevent loss of media

  • Break-up mud balls

Erklärung

Frage 42 von 100

1

Where would you most likely see high levels of nitrate in the groundwater supply?

Wähle eine der folgenden:

  • Near agricultural land

  • In very deep wells

  • Near military bases

  • Near swamps

Erklärung

Frage 43 von 100

1

What is adsorption

Wähle eine der folgenden:

  • Constituents is sucked in

  • Constituents sticking to the surface of a substance

  • Molecule is converted from aqueous phase to solid phase

  • Contaminant breaks up into smaller particles

Erklärung

Frage 44 von 100

1

In which part of the water treatment plant are 99% of the suspended solids removed?

Wähle eine der folgenden:

  • Coagulation

  • Disinfection

  • Flocculation

  • Sedimentation and filtration

Erklärung

Frage 45 von 100

1

Which of the following will most likely lead to the lowest concentration of THMs in treated water?

Wähle eine der folgenden:

  • Sodium hypochlorite

  • Chlorine gas

  • Chloramines

  • Calcium hypochlorite

Erklärung

Frage 46 von 100

1

Which of the following is not true about the Total Coliform Rule?

Wähle eine der folgenden:

  • Uses a presence and absence approach

  • Compliance is determined on a monthly basis

  • Each total coliform-positive routine sample must be tested for the presence of fecal coliforms

  • Smaller systems that collect fewer than 40 samples cannot have coliform positive results in more than 2 samples per month

Erklärung

Frage 47 von 100

1

Which of the following is true about fusible plugs on a chlorine container?

Wähle eine der folgenden:

  • Use it as the point of connection

  • Always remove it before use

  • Never remove it

  • Should be removed during maintenance

Erklärung

Frage 48 von 100

1

What is the most common water quality complaint from customers?

Wähle eine der folgenden:

  • Color

  • Taste and odor problems

  • Scaling

  • Corrosion

Erklärung

Frage 49 von 100

1

What information should be identified on the sampling container?

Wähle eine der folgenden:

  • Sampling location, date, and time

  • Concentration of all constituents

  • Probable cause of contamination

  • Type of treatment used at the plant

Erklärung

Frage 50 von 100

1

What is the standard requirement for conventional and direct filtration?

Wähle eine der folgenden:

  • Filtered water must be less than or equal to 0.2 NTU in 95% of monthly measurements

  • Filtered water must be less than or equal to 1.0 NTU in 95% of monthly measurements

  • Filtered water must be less than or equal to 0.5 NTU in 95% of monthly measurements

  • Filtered water must be less than or equal to 0.3 NTU in 95% of monthly measurements

Erklärung

Frage 51 von 100

1

What is the main drawback of using sodium hypochlorite to disinfect water?

Wähle eine der folgenden:

  • Expensive

  • Formation of THMs

  • Difficult to procure

  • Most dangerous form of disinfectant to store at plant

Erklärung

Frage 52 von 100

1

What is one of the causes of hardness of water?

Wähle eine der folgenden:

  • Arsenic

  • Nitrate

  • Calcium

  • Manganese

Erklärung

Frage 53 von 100

1

Which chemical is used to raise the pH in water?

Wähle eine der folgenden:

  • Citric acid

  • Carbon dioxide

  • Sulfuric acid

  • Soda ash

Erklärung

Frage 54 von 100

1

What is the purpose of flocculation?

Wähle eine der folgenden:

  • Mix coagulants with raw water

  • Add chlorine prior to filtration

  • Slowly stir water to bring smaller flocs together to form larger ones

  • Oxidize mineral

Erklärung

Frage 55 von 100

1

Which of the following range of pH is considered to be acidic?

Wähle eine der folgenden:

  • 8-10

  • 0-6

  • 11-13

  • 7

Erklärung

Frage 56 von 100

1

What is the term used to describe the upper layer of a stratified reservoir?

Wähle eine der folgenden:

  • Epilimnion

  • Thermocline

  • Hypolimnion

  • Metalimnion

Erklärung

Frage 57 von 100

1

What is another name for the Multiple Tube Fermentation test?

Wähle eine der folgenden:

  • MPC

  • MFF

  • MDS

  • MPN

Erklärung

Frage 58 von 100

1

What impact does precipitated manganese have on water?

Wähle eine der folgenden:

  • Brownish water

  • Blackish water

  • Reddish water

  • No impact

Erklärung

Frage 59 von 100

1

Which of the following is not part of the Surface Water Treatment Rule?

Wähle eine der folgenden:

  • Applies to all public water systems using surface water sources or ground water sources under the direct influence of surface water

  • Requires most water systems to filter and disinfect water from surface water sources or ground water under direct influence

  • Establishes maximum contaminant level goals (MCLGs) for viruses, bacteria, and Giardia lamblia

  • All water systems are allowed to use disinfection only for surface water sources that meet criteria for water quality and watershed protection

Erklärung

Frage 60 von 100

1

What is a typical characteristic of chlorine gas?

Wähle eine der folgenden:

  • Greenish yellow color

  • Blue color

  • Orange color

  • Brown color

Erklärung

Frage 61 von 100

1

Which of the following is not true about the Total Coliform Rule?

Wähle eine der folgenden:

  • Each total coliform-positive routine sample must be tested for the presence of fecal coliform or E. coli

  • If any routine sample is total coliform-positive, repeat samples are required.

  • Establishes a maximum contaminant level (MCL) based on the presence of absence of total coliforms

  • Monthly sampling requirements are not based on population served

Erklärung

Frage 62 von 100

1

What can be done to minimize the formation of THM?

Wähle eine der folgenden:

  • Increase the chlorination before filtration

  • Increase precursors

  • Eliminate or reduce chlorination before the filters

  • Increase temperature

Erklärung

Frage 63 von 100

1

What is the source of fecal coliform bacteria?

Wähle eine der folgenden:

  • Sand

  • Feces

  • Leaves

  • Inorganic

Erklärung

Frage 64 von 100

1

What is the drawback of using UV for disinfection?

Wähle eine der folgenden:

  • DBPs

  • Involves storage of toxic chemicals

  • High energy cost

  • Longer contact time required

Erklärung

Frage 65 von 100

1

What are the two types of aquifers

Wähle eine der folgenden:

  • Confined and unconfined

  • Static and pumping

  • Cationic and anionic

  • Eutrophic and oligotrophic

Erklärung

Frage 66 von 100

1

What is a common problem associated with hardness in water?

Wähle eine der folgenden:

  • Corrosion

  • Blue Baby Syndrome

  • High Blood Pressure

  • Scaling

Erklärung

Frage 67 von 100

1

What is the problem with very soft water?

Wähle eine der folgenden:

  • Scaling

  • Leads to kidney disease

  • Corrosion

  • THM formation

Erklärung

Frage 68 von 100

1

Why is it harmful to backwash at a high velocity?

Wähle eine der folgenden:

  • Forms mudballs

  • Flushes some media into spent backwash water

  • Increases build-up (headloss)

  • Forms THMs

Erklärung

Frage 69 von 100

1

What occurs on the right side of the breakpoint chlorination curve?

Wähle eine der folgenden:

  • Chlorine is destroyed by reducing compound

  • Formation of chloroganics

  • Chlororganics partly destroyed

  • Free available residual chlorine begin to form

Erklärung

Frage 70 von 100

1

How does Powder Activated Carbon (PAC) remove contaminants from the water?

Wähle eine der folgenden:

  • Absorption

  • Disinfection

  • Adsorption

  • Filtration

Erklärung

Frage 71 von 100

1

Which entity is responsible for enforcing the drinking water standards?

Wähle eine der folgenden:

  • State

  • City

  • County

  • Federal EPA

Erklärung

Frage 72 von 100

1

How is the rate of head loss affected by a more uniform filter media?

Wähle eine der folgenden:

  • Faster

  • Slower

  • Unaffected

  • More breakthroughs

Erklärung

Frage 73 von 100

1

Which of the following is true about soluble iron and Manganese?

Wähle eine der folgenden:

  • Carcinogens

  • Reddish brown

  • Black

  • Colorless

Erklärung

Frage 74 von 100

1

What is the reason for adding coagulants at the flash mixer?

Wähle eine der folgenden:

  • Stir flocs together

  • Oxidize iron and manganese

  • Neutralize negative charge on colloids

  • Pre-chlorination

Erklärung

Frage 75 von 100

1

Why would a water purveyor switch from chlorine gas to sodium hypochlorite?

Wähle eine der folgenden:

  • Eliminate THMs

  • Safety

  • To minimize liquid chemical storage at plant

  • To eliminate the usage of free chlorine at the plant

Erklärung

Frage 76 von 100

1

Which pathogen is smallest in size

Wähle eine der folgenden:

  • Bacteria

  • Protozoa

  • Cyst

  • Virus

Erklärung

Frage 77 von 100

1

Which of the following is not an example of a suspended solid?

Wähle eine der folgenden:

  • Silt

  • Decaying plants

  • Animal matter

  • Soluble calcium

Erklärung

Frage 78 von 100

1

Which of the following is not a type of a coliform test?

Wähle eine der folgenden:

  • Multiple Tube Fermentation method

  • Membrane Filter Method

  • DPD

  • Colilert Method

Erklärung

Frage 79 von 100

1

What is the definition of a public water system?

Wähle eine der folgenden:

  • Publicly or privately owned water system that has at least 15 service connections, or regularly serves and average of at least 25 people daily at least 60 days per year

  • Publicly or privately owned water system that has at least 25 service connections, or regularly serves and average of at least 25 people daily at least 60 days per year

  • Publicly or privately owned water system that has at least 35 service connections, or regularly serves and average of at least 25 people daily at least 60 days per year

  • Publicly or privately owned water system that has at least 45 service connections, or regularly serves and average of at least 25 people daily at least 60 days per year

Erklärung

Frage 80 von 100

1

When is Brilliant Green Bile used to test for coliform?

Wähle eine der folgenden:

  • Membrane Filter Method

  • Multiple Tube Fermentation method

  • Colisure Method

  • MF Method - Escherichia coli

Erklärung

Frage 81 von 100

1

Which of the following is the correct order of treatment for a conventional water treatment plant?

Wähle eine der folgenden:

  • Intake, Coagulation, Flocculation, Filtration, Sedimentation, Disinfection

  • Intake, Flocculation, Coagulation, Filtration, Sedimentation, Disinfection

  • Intake, Coagulation, Flocculation, Sedimentation, Filtration, Disinfection

  • Intake, Flocculation, Sedimentation, Coagulation, Filtration, Disinfection

Erklärung

Frage 82 von 100

1

What might happen if insufficient amount of coagulants were injected into the flash mixer?

Wähle eine der folgenden:

  • Excessive increase in floc size

  • Scaling becomes a problem

  • Worsens DBP problem

  • Some colloids may repel each other

Erklärung

Frage 83 von 100

1

Which of the following is a grab sample?

Wähle eine der folgenden:

  • Time proportional

  • Sample taken on a one time basis without consideration of flow or time

  • Flow proportional

  • A collection of numerous individual discrete samples taken at regular intervals over a period of time

Erklärung

Frage 84 von 100

1

What happens over the course of a filter run time?

Wähle eine der folgenden:

  • Headloss decreases

  • Headloss is unaffected

  • Headloss increases

  • Headless goes to zero

Erklärung

Frage 85 von 100

1

When is direct filtration used instead of conventional water treatment?

Wähle eine der folgenden:

  • When source water is low in turbidity, color, and coliform

  • When source water is low in iron and manganese

  • When source water is low in nitrates

  • When source water has an ideal pH and temperature

Erklärung

Frage 86 von 100

1

Convert 1,210 gpm to ft3/sec

Wähle eine der folgenden:

  • 1.7 ft3/s

  • 2.7 ft3/s

  • 3.9 ft3/s

  • 4.8 ft3/s

Erklärung

Frage 87 von 100

2

If a tank with a diameter of 60 feet, and a height of 30 feet is filled at a rate of 1,303 gpm, then how long will it take to fill this tank? Assume the tank was empty.

Wähle eine der folgenden:

  • 4.0 hours

  • 9.8 hours

  • 3.5 hours

  • 8.1 hours

Erklärung

Frage 88 von 100

2

How many 150-lb chlorine gas cylinders will you need per day to dose the water supply at 1.6 mg/L if the demand for water in a 24-hour period is 11,166,264 gallons?

Wähle eine der folgenden:

  • 3 cylinders

  • 2 cylinders

  • 1 cylinder

  • 4 cylinders

Erklärung

Frage 89 von 100

2

If the discharge pipe at a pump station is located 32 feet below the City Hall, what must the pressure be in the discharge pipe so that the water reaches the City Hall at a pressure of 62 psi? Assume that pipe friction and head loss are negligible.

Wähle eine der folgenden:

  • 75.9 psi

  • 53.4 psi

  • 62.7 psi

  • 59.2 psi

Erklärung

Frage 90 von 100

2

If a well has a static water level of 62 feet and a pumping water level of 83 feet, then what is the specific capacity if the well yield is 1,000 gpm?

Wähle eine der folgenden:

  • 32 gpm/ft

  • 47.6 gpm/ft

  • 56.7 gpm/ft

  • 65.1 gpm/ft

Erklärung

Frage 91 von 100

2

IF a 25% copper sulfate solution is added to a reservoir with a volume of 400,000 cubic feet, and the intended dose is 0.4 mg/L, then what is the amount of copper sulfate solution required in lbs?

Wähle eine der folgenden:

  • 29.9 lbs.

  • 45.2 lbs.

  • 39.9 lbs.

  • 67.8 lbs.

Erklärung

Frage 92 von 100

2

A pump with an efficiency of 77% and a motor of 91% are used to lift water 52 feet at a rate of 500 gpm. If the electrical unit cost is $0.14 kWh, then what is the daily cost to operate the pump and motor? Assume the equipment runs 24 hours/day.

Wähle eine der folgenden:

  • $19.21

  • $41.25

  • $32.25

  • $23.52

Erklärung

Frage 93 von 100

2

If a rectangular basin that is 50 feet long and 30 feet wide has a water level of 2 feet at 11 a.m., and rises to a water level of 20 feet at 6 p.m., then what is the pumping rate?

Wähle eine der folgenden:

  • 580.9 gpm

  • 480 gpm

  • 621.7 gpm

  • 348.1 gpm

Erklärung

Frage 94 von 100

2

A steel tank with a diameter of 45 feet and a height of 25 feet is draining at a flow rate of 342 gpm. What is the pressure 18 inches from the bottom of the tank, 4.2 hours later? Assume that the tank is initially full.

Wähle eine der folgenden:

  • 17 psi

  • 12 psi

  • 7 psi

  • 2.5 psi

Erklärung

Frage 95 von 100

2

How many pounds of 25% copper sulfate solution do you need to make 145 pounds of 3% copper sulfate solution?

Wähle eine der folgenden:

  • 17.4 lbs

  • 19.8 lbs

  • 21.3 lbs

  • 14.7 lbs

Erklärung

Frage 96 von 100

2

If you are required to have a chlorine dose of 1.7 mg/L in a 3-million gallon steel tank, then how many gallons of a 12.5% sodium hypochlorite solution will need to be injected? Assume the specific weight of the chemical is 10lbs/gallon, and that the tank is 40% full. There is not chlorine in the water prior to dosage.

Wähle eine der folgenden:

  • 3.6 gallons

  • 1.7 gallons

  • 13.6 gallons

  • 4.2 gallons

Erklärung

Frage 97 von 100

2

If the surface dimensions of a sand filtration bed are 35 feet (length) and 30 feet (width), then what is the filtration rate if the flow is 2,525 gallons per minute?

Wähle eine der folgenden:

  • 1.9 GPM/sq. ft.

  • 4.2 GPM/sq. ft.

  • 3.5 GPM/sq. ft.

  • 2.4 GPM/sq. ft.

Erklärung

Frage 98 von 100

2

If the desired concentration of chlorine in a 2-million gallon welded steel tank is 2 mg/L, then how many pounds of 65% calcium hypochlorite tablet must be placed inside the tank?

Wähle eine der folgenden:

  • 59 lbs

  • 51 lbs

  • 69 lbs

  • 40 lbs

Erklärung

Frage 99 von 100

2

If the velocity of water in a 6-inch pipe is 4.5 ft/s, then what is the velocity of the water if the pipe transitions to a 8 -inch pipe?

Wähle eine der folgenden:

  • 2.5 ft/s

  • 5 ft/s

  • 1.9 ft/s

  • 6.4 ft/s

Erklärung

Frage 100 von 100

2

If 1.2 MGD of water flows through a rectangular sedimentation basin that is 55 feet long and 30 feet wide, then what is the overflow rate?

Wähle eine der folgenden:

  • 0.24 GPM/sq. ft.

  • 0.51 GPM/sq. ft.

  • 0.68 GPM/sq. ft.

  • 041 GPM/sq. ft.

Erklärung

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