question

Distribution systems are usually laid out in which of the following patterns besides Tree shaped and Grid designs? a. Loops and/or circular designs b. Vertical designs without backflow prevention devices c. Horizontal lines that flow into open ponds then back into a closed pipe d. Horizontal lines that flow into underground sumps then back into a closed pipe

answer

a. Loops and/or circular designs

question

Dead ends in a system are usually located on a. Loops and/or circular designs b. Tree shaped and Grid designs c. Oval designs d. transmission mains e. Cul de Sac's with return lines

answer

b. Tree shaped and Grid designs

question

An operator may refer to Piezometric elevation, static head, or pressure head as a. horizontal water elevation b. water pressure from a pump c. maximum pressure from a fire hydrant d. vertical water column height

answer

d. vertical water column height

question

A downstream closed sectionalizing valve without pressure reducing valves in the system will have which of the following pressures placed upon it? a. the water surface elevation from the last point where the water is open to the atmosphere b. the back pressures from a downstream point c. the downstream booster pump operation d. the operation of a fire hydrant located immediately downstream of the hydrant

answer

a. the water surface elevation from the last point where the water is open to the atmosphere

question

What is the main purpose of a water storage facility? a. to allow storage reserve during wet periods b. to help maintain adequate pressures throughout the entire system c. to meet needs for fire protection d. to provide sufficient amount of water to average or equalize the daily demands plus provide minimum pressures to fight fires

answer

d. to provide sufficient amount of water to average or equalize the daily demands plus provide minimum pressures to fight fires

question

Electrical demand in a wiring system is determined by the amount of a. Ohms in the entire system b. Voltage a system draws c. Watts consumed d. water pressure in the system

answer

c. Watts consumed

question

Baffling inside a storage facility may be needed to prevent \"hot spots\" and a. straight through flows b. long contact times with disinfectants c. high chlorine residuals throughout the facility d. high temperatures throughout the storage facility

answer

a. straight through flows

question

Chlorine may be added to water in a continuous, slug, and/or the _______ method to initially disinfect a pipeline? a. segmented b. tablet c. low dose d. air injection

answer

b. tablet

question

Wear rings in a centrifugal pump are designed to a. prevent excessive internal water circulation between the suction and discharge sides of a pump b. prevent wear of the impeller and inside case c. allow excessive internal water circulation to occur between the suction and discharge d. both a & b are correct, but not c

answer

d. both a & b are correct, but not c

question

Packing ring notches in a centrifugal type pump should be ______ when placed in the stuffing box? a. water tight b. staggered 90º c. made of rubber not metal d. heated

answer

b. staggered 90º

question

Eighty parts per billion (80 ppb) is equal to which of the following? a. 8 ppm b. 0.8 mg/L c. 0.08 mg/L d. 80 mg/L

answer

c. 0.08 mg/L

question

A mass of concrete placed at bends and valve structures to prevent pipeline movement is commonly called a a. thrust block c. curb stop b. corp stop d. service block

answer

a. thrust block

question

What is the main difference between surface and groundwater contamination? a. groundwater takes longer to recover after contamination b. groundwaters are less susceptible to contamination c. surface waters take longer to recover d. surface waters are usually harder and more difficult to recover

answer

a. groundwater takes longer to recover after contamination

question

What constitutes a cross-connection? a. a connection between an approved and an unapproved water supply b. an unprotected connection between a drinking water supply and a system not approved as safe c. a connection between a contaminated supply and non-potable supplies d. all of the above

answer

a. a connection between an approved and an unapproved water supply

question

According to the Center for Disease Control (CDC), which mechanism or problem has caused more waterborne disease outbreaks (WDO) in the United States than any other reported factor? a. inadequate O&M of filtering systems b. lack of chlorination c. wellhead protection d. leaking backflow prevention equipment

answer

d. leaking backflow prevention equipment

question

What type of meter is used when the water flow widely fluctuates? a. Nutating-disc (nodding) meters b. Compound meters c. Proportional meters d. Venturi meters

answer

b. Compound meters

question

What are the basic requirements for an acceptable meter installation? a. leakage rate kept to a minimum b. always be in the public's view c. position in a horizontal plane, not tilted d. be inaccessible for service and inspection e. hid behind a fence near dog confinement areas

answer

c. position in a horizontal plane, not tilted

question

How can mechanical damage to water meters be avoided? a. Placing the meter behind the curb and in a meter box b. Place the meter on top of a hydrant c. Grow shrubs around the meter d. Hide the meter behind an electrical utility pole

answer

Placing the meter behind the curb and in a meter box

question

Which of the following is a displacement meter? a. Venturi b. Piston c. Compound d. Sonic meter

answer

b. Piston

question

The C-Factor relates to a. a factor used to indicate the smoothness of the interior of a pipe b. the elevation of the invert of a pipeline c. a line that represents the elevation of energy head of water d. a water service shutoff valve

answer

a. a factor used to indicate the smoothness of the interior of a pipe

question

Which of the following is an advantage in using centrifugal pumps? a. Air leaks on the suction side b. Limited suction lift c. Cannot self prime d. Easy to repair

answer

d. Easy to repair

question

When residential water meters become worn, they have the tendency to a. over-register all flows b. under-register all flows c. under-register small flows d. create higher pressure drops at high flows

answer

b. under-register all flows

question

Which of the following is the approximate amount of ocean surface on earth? a. 75% b. 25% c. 18.5%

answer

a. 75%

question

Out of all the water on earth, which of the following is the approximate amount percentage of freshwater that is immediately available to humans? a. less than 1% (actually 0.34%) b. 20% c. 97% d. 2%

answer

a. less than 1% (actually 0.34%)

question

The term associated with water that evaporates from living plants is referred to as a. evapotranspiration b. condensation c. precipitation d. transpiration

answer

a. evapotranspiration

question

Of all the water on earth, which of the following percentages represent the amount of saltwater on earth? a. 25% b. 75% c. 90% d. 97%

answer

d. 97%

question

When sampling for bacteria in a distribution system, the bacteria sample bottle is prepared with which chemical inside the bottle before it is sterilized? a. copper sulfate b. chlorine tablets c. sodium thiosulfate d. hydrochloric acid

answer

c. sodium thiosulfate

question

The primary purpose of disinfection of water mains is to a. kill disease causing organisms in the water, if present b. sterilize the water main c. create a chlorine taste and odor d. keep the inside of the main clean

answer

a. kill disease causing organisms in the water, if present

question

Liquified chlorine gas will expand _______ times its original volume a. 25 b. 90 c. 200 d. 460

answer

d. 460

question

Chlorine gas is _____ times heavier than breathing air a. 2.5 b. 20 c. 60 d. 460

answer

a. 2.5

question

Chlorine gas is considered to be 100% pure, bleach is approximately 5 ¼ % pure, while HTH dry powder chlorine is set at _____ % purity. a. 20% b. 45% c. 65% d. 80%

answer

c. 65%

question

When a 150-pound chlorine cylinder fitting slightly leaks around the gasket material, a gauze like material soaked in _______ should be used below the fittings to confirm the leak at the joint. a. chlorine dioxide b. sodium thiosulfate c. ammonia water d. oil

answer

c. ammonia water

question

A commonly used method to test for chlorine residual in water is called the _____ method. a. HTH b. THM c. VOC d. DPD

answer

d. DPD

question

As the pump shaft protrudes through the pump case, a mesh ring can be placed and compressed to prevent excessive leakage. This ring is commonly called the a. mechanical ring b. packing ring c. free ring d. bearing ring

answer

b. packing ring

question

When chlorine gas is added to water the pH goes down due to a. chlorine gas producing caustic substances b. two base materials that form c. two acids that form d. caustic soda being formed in the water

answer

c. two acids that form

question

Water with a pH of 7.9 is considered to be a. acidic b. basic or alkaline c. neutral d. undrinkable

answer

b. basic or alkaline

question

A 5-foot deep pipe trench requires exit ladders every 25-feet and it needs to a. have approved shoring b. have exit ramps c. have hoists every 10-25 feet d. have an ambulance in a stand-by mode

answer

a. have approved shoring

question

When turning a centrifugal pump off, which of the following has to be done to prevent water hammer? a. check its temperature b. close the discharge valve c. throttle the suction valve d. allow the pump to cavitate

answer

b. close the discharge valve

question

Circular devices placed in the stuffing box of a centrifugal pump to prevent or limit air from entering the flow stream is called a a. lantern ring b. packing ring c. mechanical ring d. throttling ring

answer

a. lantern ring

question

When an operator isolates a motor from an operable system for repair, it is vital that he/she follow a ________/________ procedure. a. pumps/motors b. Ohms/Watts c. lock-out/tag-out d. AC/DC

answer

c. lock-out/tag-out

question

Horsepower is defined as ______________ ft-lbs per minute or 746 watts a. 8.34 b. 0.785 D2 c. 33,000 d. 43,560

answer

c. 33,000

question

The rated flow of a water meter, as stated by the manufacturer, is based upon which type of flow? a. intermittent b. short-time peak c. continuous d. the maximum capacity at peak flow

answer

c. continuous

question

What is the minimum setback distance for fire hydrants to avoid large vehicle overhang? a. 1 ½ -feet b. 2-feet c. 3-feet d. 3.5-feet

answer

b. 2-feet

question

The primary reason for using dry barrel fire hydrants is to a. allow easy maintenance of the hydrant b. prevent water hammer c. keep the barrel from rusting d. keep the barrel from freezing in cold weather

answer

d. keep the barrel from freezing in cold weather

question

Wet-barrel hydrants a. have slide gate main valves b. have main toggle valves c. have standard compression main valves d. do not have main valves, but separate nozzle valves

answer

d. do not have main valves, but separate nozzle valves

question

When taking a storage facility out-of-service you must: a. recycle all metal b. build another storage facility c. coordinate and plan the shutdown, so that the distribution system will be able to meet customer's demands d. build up the water pressure and save it

answer

c. coordinate and plan the shutdown, so that the distribution system will be able to meet customer's demands

question

The three main components of a centrifugal pump are a. propeller, motor, and wiring harness b. wear rings, lantern rings, and volute c. impeller, case, and shaft d. shaft, wear rings, and AC power connection

answer

c. impeller, case, and shaft

question

Below ground storage tanks are vulnerable in having which of the following? a. high pressures within the tank b. insects and root damage c. sunlight penetration that reduces chlorine residuals d. high total dissolved solid content

answer

b. insects and root damage

question

The pipeline flushing process tends to remove most deposits, encrustations, sediments and other debris. Customers should be notified to expect _________ after the flushing operation is completed. a. a residual amount of sediment coming into the dwelling for at least a few hours, so it would be best to flush their own lines when noticed b. hot water c. pure water d. to boil their water for at least one-week

answer

a. a residual amount of sediment coming into the dwelling for at least a few hours, so it would be best to flush their own lines when noticed

question

The hydrologic cycle is composed of all the following terms, except a. condensation b. evaporation d. precipitation c. percolation e. adsorption

answer

e. adsorption

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