Joe Jorgensen
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Water Treatment Operator Certification

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Joe Jorgensen
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Treatment 1/2 Practice Test 2

Questão 1 de 100

1

What is a pathogen?

Selecione uma das seguintes:

  • Algae

  • Laurel Tryptose

  • MTBE

  • Disease-causing microorganism

Explicação

Questão 2 de 100

1

What is the impact of algae to water quality?

Selecione uma das seguintes:

  • Elevated hardness

  • Increase in Cryptosporidium

  • Taste and odor problems

  • Corrosively

Explicação

Questão 3 de 100

1

What is the concentration of chlorine gas?

Selecione uma das seguintes:

  • 12.5%

  • 100%

  • 65%

  • 22.5%

Explicação

Questão 4 de 100

1

Which of the following is not used to mix coagulants?

Selecione uma das seguintes:

  • Hydraulic mixing

  • Mechanical mixing

  • Diffuser

  • Horizontal paddle wheel

Explicação

Questão 5 de 100

1

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

Selecione uma das seguintes:

  • Feed a filter-aid chemical to the filter influent

  • Increase plant flowrate

  • Backwash less frequently

  • Reduce speed of rapid mixer

Explicação

Questão 6 de 100

1

What is the likely cause of pinging in a pump?

Selecione uma das seguintes:

  • Water hardness

  • Frequent starting and stopping

  • Cavitation

  • Corrosion

Explicação

Questão 7 de 100

1

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

Selecione uma das seguintes:

  • Minimize mud ball formation

  • Sodium hydroxide

  • Flowrate

  • Proper backwashing

Explicação

Questão 8 de 100

1

What is a sanitary survey?

Selecione uma das seguintes:

  • 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

Explicação

Questão 9 de 100

1

Which of the following categories does bacteria belong to?

Selecione uma das seguintes:

  • Dissolved

  • Settleable

  • Inorganic

  • Colloidal

Explicação

Questão 10 de 100

1

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

Selecione uma das seguintes:

  • 99%

  • 99.99%

  • 90%

  • 95%

Explicação

Questão 11 de 100

1

Which of the following is not considered free residual chlorine?

Selecione uma das seguintes:

  • Hypochlorous acid

  • Hyochlorite ion

  • Monochloramine

  • Chlorine

Explicação

Questão 12 de 100

1

Why is coliform used as an indicator organism?

Selecione uma das seguintes:

  • 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

Explicação

Questão 13 de 100

1

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

Selecione uma das seguintes:

  • Rest stop

  • Subdivision

  • Retirement community

  • School

Explicação

Questão 14 de 100

1

What is the purpose of packing in a pump?

Selecione uma das seguintes:

  • 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

Explicação

Questão 15 de 100

1

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

Selecione uma das seguintes:

  • Raises it

  • Lowers it

  • Unaffected by it

  • Creates instability of pH

Explicação

Questão 16 de 100

1

What is an unconfined aquifer?

Selecione uma das seguintes:

  • 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

Explicação

Questão 17 de 100

1

What is a static water level in a well?

Selecione uma das seguintes:

  • 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

Explicação

Questão 18 de 100

1

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

Selecione uma das seguintes:

  • Alkalinity

  • pH

  • Temperature

  • Hardness

Explicação

Questão 19 de 100

1

What is formed when free chlorine reacts with ammonia?

Selecione uma das seguintes:

  • Ammonia hydroxide

  • Ammonia chloroform

  • Chloramine

  • Ammonium nitrate

Explicação

Questão 20 de 100

1

Which contaminant causes Blue Baby Syndrome?

Selecione uma das seguintes:

  • Copper

  • Nitrate

  • Lead

  • Arsenic

Explicação

Questão 21 de 100

1

What is free Chlorine?

Selecione uma das seguintes:

  • 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

Explicação

Questão 22 de 100

1

What is a thermocline?

Selecione uma das seguintes:

  • 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

Explicação

Questão 23 de 100

1

What agency protects the health and safety of industrial employees?

Selecione uma das seguintes:

  • Public Utilities commission

  • EPA

  • OSHA

  • NEPA

Explicação

Questão 24 de 100

1

What is the first priority in water treatment?

Selecione uma das seguintes:

  • 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

Explicação

Questão 25 de 100

1

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

Selecione uma das seguintes:

  • Blue Baby Syndrome

  • Breathing problems

  • Diarrhea

  • Cardiovascular effects, increased blood pressure and incidence of hypertension

Explicação

Questão 26 de 100

1

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

Selecione uma das seguintes:

  • Drawdown

  • Radius of influence

  • Pumping water level

  • Piezometric surface

Explicação

Questão 27 de 100

1

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

Selecione uma das seguintes:

  • DPD test

  • MPN method

  • Jar test

  • Colilert method

Explicação

Questão 28 de 100

1

What are the 4 zones of a clarifier?

Selecione uma das seguintes:

  • Inlet, Outlet, Settling, Sludge

  • Inlet, Outlet, Settling, Skimming

  • Inlet, Outlet, Settling, Baffles

  • Settling, Baffles, Skimming, Sludge

Explicação

Questão 29 de 100

1

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

Selecione uma das seguintes:

  • Nanofiltration

  • Conventional water treatment

  • Ion Exchange

  • Microfiltration

Explicação

Questão 30 de 100

1

Which of the following impacts the color of source water?

Selecione uma das seguintes:

  • Sodium

  • Pressure

  • Organics, such as soil and leaves

  • Temperature

Explicação

Questão 31 de 100

1

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

Selecione uma das seguintes:

  • Deep well

  • Shallow well

  • Artesian

  • Lake

Explicação

Questão 32 de 100

1

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

Selecione uma das seguintes:

  • Well drawdown

  • Safe yield

  • Cone of depression

  • Specific yield

Explicação

Questão 33 de 100

1

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

Selecione uma das seguintes:

  • CO2

  • Iron

  • Ammonia

  • Acid

Explicação

Questão 34 de 100

1

Which of the following is an unstable form of disinfection?

Selecione uma das seguintes:

  • Ozonation

  • Sodium hypochlorite

  • Chloramine

  • UV

Explicação

Questão 35 de 100

1

How many stages are in a breakpoint chlorination curve?

Selecione uma das seguintes:

  • 3

  • 2

  • 1

  • 4

Explicação

Questão 36 de 100

1

Chlorine demand is best described as which of the following?

Selecione uma das seguintes:

  • Chlorine dose + Chlorine residual

  • Chlorine dose - Chlorine residual

  • Chlorine dose X Chlorine residual

  • The amount of chlorine required to linger in the pipeline

Explicação

Questão 37 de 100

1

What is an example of a natural organic matter?

Selecione uma das seguintes:

  • Iron

  • Manganese

  • Fallen leaves

  • Arsenic

Explicação

Questão 38 de 100

1

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

Selecione uma das seguintes:

  • Positive charge on the surface

  • Negative charge on the surface

  • Neutral charge on the surface

  • Cationic attributes

Explicação

Questão 39 de 100

1

What is short circuiting in a clarifier?

Selecione uma das seguintes:

  • Electrical problems in the control panel

  • Negative electrical charge on colloid

  • Electrical charge neutralized by alum

  • Shorter settling time in basin

Explicação

Questão 40 de 100

1

What would cause a filter to begin backwashing?

Selecione uma das seguintes:

  • Low chlorine concentration

  • Presence of THM

  • Head loss

  • Temperature

Explicação

Questão 41 de 100

1

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

Selecione uma das seguintes:

  • Clear under drain

  • Expand filter media

  • Prevent loss of media

  • Break-up mud balls

Explicação

Questão 42 de 100

1

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

Selecione uma das seguintes:

  • Near agricultural land

  • In very deep wells

  • Near military bases

  • Near swamps

Explicação

Questão 43 de 100

1

What is adsorption

Selecione uma das seguintes:

  • 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

Explicação

Questão 44 de 100

1

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

Selecione uma das seguintes:

  • Coagulation

  • Disinfection

  • Flocculation

  • Sedimentation and filtration

Explicação

Questão 45 de 100

1

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

Selecione uma das seguintes:

  • Sodium hypochlorite

  • Chlorine gas

  • Chloramines

  • Calcium hypochlorite

Explicação

Questão 46 de 100

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 47 de 100

1

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

Selecione uma das seguintes:

  • Use it as the point of connection

  • Always remove it before use

  • Never remove it

  • Should be removed during maintenance

Explicação

Questão 48 de 100

1

What is the most common water quality complaint from customers?

Selecione uma das seguintes:

  • Color

  • Taste and odor problems

  • Scaling

  • Corrosion

Explicação

Questão 49 de 100

1

What information should be identified on the sampling container?

Selecione uma das seguintes:

  • Sampling location, date, and time

  • Concentration of all constituents

  • Probable cause of contamination

  • Type of treatment used at the plant

Explicação

Questão 50 de 100

1

What is the standard requirement for conventional and direct filtration?

Selecione uma das seguintes:

  • 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

Explicação

Questão 51 de 100

1

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

Selecione uma das seguintes:

  • Expensive

  • Formation of THMs

  • Difficult to procure

  • Most dangerous form of disinfectant to store at plant

Explicação

Questão 52 de 100

1

What is one of the causes of hardness of water?

Selecione uma das seguintes:

  • Arsenic

  • Nitrate

  • Calcium

  • Manganese

Explicação

Questão 53 de 100

1

Which chemical is used to raise the pH in water?

Selecione uma das seguintes:

  • Citric acid

  • Carbon dioxide

  • Sulfuric acid

  • Soda ash

Explicação

Questão 54 de 100

1

What is the purpose of flocculation?

Selecione uma das seguintes:

  • Mix coagulants with raw water

  • Add chlorine prior to filtration

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

  • Oxidize mineral

Explicação

Questão 55 de 100

1

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

Selecione uma das seguintes:

  • 8-10

  • 0-6

  • 11-13

  • 7

Explicação

Questão 56 de 100

1

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

Selecione uma das seguintes:

  • Epilimnion

  • Thermocline

  • Hypolimnion

  • Metalimnion

Explicação

Questão 57 de 100

1

What is another name for the Multiple Tube Fermentation test?

Selecione uma das seguintes:

  • MPC

  • MFF

  • MDS

  • MPN

Explicação

Questão 58 de 100

1

What impact does precipitated manganese have on water?

Selecione uma das seguintes:

  • Brownish water

  • Blackish water

  • Reddish water

  • No impact

Explicação

Questão 59 de 100

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 60 de 100

1

What is a typical characteristic of chlorine gas?

Selecione uma das seguintes:

  • Greenish yellow color

  • Blue color

  • Orange color

  • Brown color

Explicação

Questão 61 de 100

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 62 de 100

1

What can be done to minimize the formation of THM?

Selecione uma das seguintes:

  • Increase the chlorination before filtration

  • Increase precursors

  • Eliminate or reduce chlorination before the filters

  • Increase temperature

Explicação

Questão 63 de 100

1

What is the source of fecal coliform bacteria?

Selecione uma das seguintes:

  • Sand

  • Feces

  • Leaves

  • Inorganic

Explicação

Questão 64 de 100

1

What is the drawback of using UV for disinfection?

Selecione uma das seguintes:

  • DBPs

  • Involves storage of toxic chemicals

  • High energy cost

  • Longer contact time required

Explicação

Questão 65 de 100

1

What are the two types of aquifers

Selecione uma das seguintes:

  • Confined and unconfined

  • Static and pumping

  • Cationic and anionic

  • Eutrophic and oligotrophic

Explicação

Questão 66 de 100

1

What is a common problem associated with hardness in water?

Selecione uma das seguintes:

  • Corrosion

  • Blue Baby Syndrome

  • High Blood Pressure

  • Scaling

Explicação

Questão 67 de 100

1

What is the problem with very soft water?

Selecione uma das seguintes:

  • Scaling

  • Leads to kidney disease

  • Corrosion

  • THM formation

Explicação

Questão 68 de 100

1

Why is it harmful to backwash at a high velocity?

Selecione uma das seguintes:

  • Forms mudballs

  • Flushes some media into spent backwash water

  • Increases build-up (headloss)

  • Forms THMs

Explicação

Questão 69 de 100

1

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

Selecione uma das seguintes:

  • Chlorine is destroyed by reducing compound

  • Formation of chloroganics

  • Chlororganics partly destroyed

  • Free available residual chlorine begin to form

Explicação

Questão 70 de 100

1

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

Selecione uma das seguintes:

  • Absorption

  • Disinfection

  • Adsorption

  • Filtration

Explicação

Questão 71 de 100

1

Which entity is responsible for enforcing the drinking water standards?

Selecione uma das seguintes:

  • State

  • City

  • County

  • Federal EPA

Explicação

Questão 72 de 100

1

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

Selecione uma das seguintes:

  • Faster

  • Slower

  • Unaffected

  • More breakthroughs

Explicação

Questão 73 de 100

1

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

Selecione uma das seguintes:

  • Carcinogens

  • Reddish brown

  • Black

  • Colorless

Explicação

Questão 74 de 100

1

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

Selecione uma das seguintes:

  • Stir flocs together

  • Oxidize iron and manganese

  • Neutralize negative charge on colloids

  • Pre-chlorination

Explicação

Questão 75 de 100

1

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

Selecione uma das seguintes:

  • Eliminate THMs

  • Safety

  • To minimize liquid chemical storage at plant

  • To eliminate the usage of free chlorine at the plant

Explicação

Questão 76 de 100

1

Which pathogen is smallest in size

Selecione uma das seguintes:

  • Bacteria

  • Protozoa

  • Cyst

  • Virus

Explicação

Questão 77 de 100

1

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

Selecione uma das seguintes:

  • Silt

  • Decaying plants

  • Animal matter

  • Soluble calcium

Explicação

Questão 78 de 100

1

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

Selecione uma das seguintes:

  • Multiple Tube Fermentation method

  • Membrane Filter Method

  • DPD

  • Colilert Method

Explicação

Questão 79 de 100

1

What is the definition of a public water system?

Selecione uma das seguintes:

  • 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

Explicação

Questão 80 de 100

1

When is Brilliant Green Bile used to test for coliform?

Selecione uma das seguintes:

  • Membrane Filter Method

  • Multiple Tube Fermentation method

  • Colisure Method

  • MF Method - Escherichia coli

Explicação

Questão 81 de 100

1

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

Selecione uma das seguintes:

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

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

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

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

Explicação

Questão 82 de 100

1

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

Selecione uma das seguintes:

  • Excessive increase in floc size

  • Scaling becomes a problem

  • Worsens DBP problem

  • Some colloids may repel each other

Explicação

Questão 83 de 100

1

Which of the following is a grab sample?

Selecione uma das seguintes:

  • 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

Explicação

Questão 84 de 100

1

What happens over the course of a filter run time?

Selecione uma das seguintes:

  • Headloss decreases

  • Headloss is unaffected

  • Headloss increases

  • Headless goes to zero

Explicação

Questão 85 de 100

1

When is direct filtration used instead of conventional water treatment?

Selecione uma das seguintes:

  • 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

Explicação

Questão 86 de 100

1

Convert 1,210 gpm to ft3/sec

Selecione uma das seguintes:

  • 1.7 ft3/s

  • 2.7 ft3/s

  • 3.9 ft3/s

  • 4.8 ft3/s

Explicação

Questão 87 de 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.

Selecione uma das seguintes:

  • 4.0 hours

  • 9.8 hours

  • 3.5 hours

  • 8.1 hours

Explicação

Questão 88 de 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?

Selecione uma das seguintes:

  • 3 cylinders

  • 2 cylinders

  • 1 cylinder

  • 4 cylinders

Explicação

Questão 89 de 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.

Selecione uma das seguintes:

  • 75.9 psi

  • 53.4 psi

  • 62.7 psi

  • 59.2 psi

Explicação

Questão 90 de 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?

Selecione uma das seguintes:

  • 32 gpm/ft

  • 47.6 gpm/ft

  • 56.7 gpm/ft

  • 65.1 gpm/ft

Explicação

Questão 91 de 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?

Selecione uma das seguintes:

  • 29.9 lbs.

  • 45.2 lbs.

  • 39.9 lbs.

  • 67.8 lbs.

Explicação

Questão 92 de 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.

Selecione uma das seguintes:

  • $19.21

  • $41.25

  • $32.25

  • $23.52

Explicação

Questão 93 de 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?

Selecione uma das seguintes:

  • 580.9 gpm

  • 480 gpm

  • 621.7 gpm

  • 348.1 gpm

Explicação

Questão 94 de 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.

Selecione uma das seguintes:

  • 17 psi

  • 12 psi

  • 7 psi

  • 2.5 psi

Explicação

Questão 95 de 100

2

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

Selecione uma das seguintes:

  • 17.4 lbs

  • 19.8 lbs

  • 21.3 lbs

  • 14.7 lbs

Explicação

Questão 96 de 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.

Selecione uma das seguintes:

  • 3.6 gallons

  • 1.7 gallons

  • 13.6 gallons

  • 4.2 gallons

Explicação

Questão 97 de 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?

Selecione uma das seguintes:

  • 1.9 GPM/sq. ft.

  • 4.2 GPM/sq. ft.

  • 3.5 GPM/sq. ft.

  • 2.4 GPM/sq. ft.

Explicação

Questão 98 de 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?

Selecione uma das seguintes:

  • 59 lbs

  • 51 lbs

  • 69 lbs

  • 40 lbs

Explicação

Questão 99 de 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?

Selecione uma das seguintes:

  • 2.5 ft/s

  • 5 ft/s

  • 1.9 ft/s

  • 6.4 ft/s

Explicação

Questão 100 de 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?

Selecione uma das seguintes:

  • 0.24 GPM/sq. ft.

  • 0.51 GPM/sq. ft.

  • 0.68 GPM/sq. ft.

  • 041 GPM/sq. ft.

Explicação

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