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ILLINOIS CLASS D WATER LICENSE EXAM | ALL
QUESTIONS AND CORRECT ANSWERS |
VERIFIED ANSWERS | GRADED A+ | NEWEST
EXAM (JUST RELEASED)
If a small public water supply pumps 3,000,000 gallons of water in a 30 day period. It's expenses total $8770. How much does it cost this public water supply to produce 1000 gallons of water? And is this, compared to the national average, considered high? ---------CORRECT ANSWER-------------- ---$2.92 per thousand gallons. And yes it is a high cost An elevator water tank sits on a bluff overlooking a river valley. The water level in this tank is 144 feet above the base of the tower. A part of the distribution system serves homes along the banks of the river. These homes are 102 feet lower than the base of the water tower. What is the average system pressure in psi at these homes ---------CORRECT ANSWER-----------------106.5 psi If a home has a higher pressure than 80 psi what should they install? --------
- CORRECT ANSWER-----------------A pressure reducing valve on their service lines A 4 inch water main 5000 feet in length than to be flushed long enough to completely change out the water in the main. How long would it take to completely fuss out this line if the fire hydrant the end of the line is flowing at a rate of 325 gallons per minute? ---------CORRECT ANSWER-------------- ---10 minutes
What is the invert of the pipe? ---------CORRECT ANSWER----------------- The lowest point of the exterior of a pipe or conduit What is OSHA? ---------CORRECT ANSWER-----------------Occupational safety and health administration What is a specific capacity as related to groundwater ---------CORRECT ANSWER-----------------Weight of a particle, substance, or chemical solution relation to the weight of an equal volume of water What is static water level ---------CORRECT ANSWER-----------------The elevation or level of the water table and the well pump is not operating What is a well casting vent ---------CORRECT ANSWER-----------------It allows air to enter well during drawdown to prevent vacuum conditions, vents excess air during well recovery Sounding tube ---------CORRECT ANSWER-----------------Permits insertions of water lever measuring device device, also used to add cleaning agents Gravel tube ---------CORRECT ANSWER-----------------Permits operator to see level of gravel and add gravel as necessary Pump pedestal ---------CORRECT ANSWER-----------------Supports the weight of the pumping unit
A water plant has a lineshaft well. The operator replaces the packing in the packing gland on the motor. After the packing has been replaced there should be ___________? ---------CORRECT ANSWER-----------------A small trickle of water when the pump is operating. A pump housing which obtains its power from a side shaft electric motor airlocks. The pump itself is extremely hot to touch. How do you correct this problem? ---------CORRECT ANSWER-----------------Leave the motor on, open the spigot, and allow the irritably off into the water flows from the Spigot Pump cavitation is most likely to occur when the top of the water source level is______________? ---------CORRECT ANSWER-----------------When the water level is changing two levels above and below the impeller When cavitation is occurring what sounds usually present --------- CORRECT ANSWER-----------------Loud noises that sound like someone's pounding on the impeller with a hammer Two Towers are both 125 feet high, when full, contain 122 feet of water. Tower 1 holds 150,000 gallons. Tower 2 holds 500,000 gallons. Each has a pressure gauge at the base. Which will register the most pressure in psi? -- -------CORRECT ANSWER-----------------Both will be equal If the water level in tower 1 is 118 feet what will the pressure reading be at the base ---------CORRECT ANSWER-----------------51.1 psi
What is the definition of potable water ---------CORRECT ANSWER----------- ------Water that does not contain objectable pollution, contamination, or infective agents and is considered safe for drinking What is the first item used when installing a service line to a customer? ----- ----CORRECT ANSWER-----------------Corporation stop If a meter to a residence is located in the basement what should be located between the water main and the house ---------CORRECT ANSWER--------- --------curb stop A 5/8" x 3/4" water meter serves a residence. Over a period of years the meter __________ in recording actual water used ---------CORRECT ANSWER-----------------Decreases To isolate part of a distribution system what type of valve is commonly used? ---------CORRECT ANSWER-----------------Gate valve Trihalomethanes (THMs) are caused by? ---------CORRECT ANSWER------- ----------Reaction of chlorinated water with numeric materials found in surface water sources The longer the contact time water and chlorine residuals enjoy the ________ the THM level will probably be ---------CORRECT ANSWER------- ----------Higher
A boil order must be issued if systems pressure drops below 20 psi or if contaminated of any part of the system is suspected. Why? --------- CORRECT ANSWER-----------------It is a regulation of the IEPA, and to protect the health of water consumers A boil order should be issued for? ---------CORRECT ANSWER----------------
- Until further notice Upon the issuance of a boil order the IEPA regional office should be notified of the order because ________________? ---------CORRECT ANSWER-----------------It's a state regulation The "C" factor of a pipe is _______________? ---------CORRECT ANSWER-----------------The smoothness of the interior of a pipe The higher the "C" factor of a pipe the _____________ the pipe and the greater the carrying capacity of the pipe ---------CORRECT ANSWER-------- ---------Smoother A distribution system that is "looped" instead of having dead ends will help prevent ---------CORRECT ANSWER-----------------Tastes and odors, "dirty" water, and chlorine depletion Chlorine tablets (calcium hypochlorite) should be used for the disinfection of newly installed water main. These tablets should be ________________ ---------CORRECT ANSWER-----------------Glued to the top of each section
What is the definition of a water main? ---------CORRECT ANSWER---------- -------Any line that passes one property to reach another parcel of property What is the minimum size of a water main required by the IEPA --------- CORRECT ANSWER-----------------4 inches in diameter Is a construction permit from the IEPA permit section required for the installation of a water main? ---------CORRECT ANSWER-----------------Yes Is a construction permit from the IEPA permit section required for the installation of a water service? ---------CORRECT ANSWER-----------------No A three-quarter inch service line is tapped on a water main. The corporation stop should be installed__________________ ---------CORRECT ANSWER-----------------At an angle between the top and side of the main A 6 inch PVC Watermain is installed what should be installed at the end of the main ---------CORRECT ANSWER-----------------Concrete thrusting block Cathodic protection in a storage tank is? ---------CORRECT ANSWER-------- ---------A small electric current used to prevent rust, corrosion, and pitting of metal surfaces What is an altitude valve? ---------CORRECT ANSWER-----------------A valve that automatically shuts off the flow into an elevated tank when the water
678,000 gallons too million gallons per day (MGD) ---------CORRECT ANSWER-----------------.678 MGD 1,245,000 gallons too million gallons per day (MGD) - --------CORRECT ANSWER-----------------1.245 MGD .895 MGD too gallons per day ---------CORRECT ANSWER----------------- 895,000 gallons 2.20 MGD too gallons per day ---------CORRECT ANSWER----------------- 2,200,000 gallons .019 MGD too gallons per day ---------CORRECT ANSWER----------------- 19,000 gallons .999 MGD too gallons per day ---------CORRECT ANSWER----------------- 999,000 gallons How much pressure (in psi) does 1 foot of elevation offer? --------- CORRECT ANSWER-----------------2.31 psi Velocity of flow in a water main is expressed in? ---------CORRECT ANSWER-----------------Beat per second
A public water supply purchases 4,500,000 gallons of water from a parent supply in a 30 day period in the same period the public water supply sells 3,900,000 gallons of water to its customers. What is the amount in gallons of unaccounted for water? What is the percentage of an accounted for water? ---------CORRECT ANSWER-----------------600,000 gallons, 13.3% What is the industry standard for acceptable water loss in a public water supply? ---------CORRECT ANSWER-----------------10% or less If the pH of a water sample is below seven units it is considered? --------- CORRECT ANSWER-----------------Acidic The average flow from a 5/8 inch x 3/4 inch water meter is _________ gpm? ---------CORRECT ANSWER----------------- 5 - 7 A connection between a possible water supply and a non-potable water supply is? ---------CORRECT ANSWER-----------------A cross connection, a possible danger to water customers, and a violation of state regulations New water main should be disinfected when? ---------CORRECT ANSWER- ----------------The pipe is installed and initially filled How many pounds of water are in a cubic foot of water? ---------CORRECT ANSWER-----------------62.4 pounds
Routine bacti. samples are collected on __________ faces at a water supply which buys its water or uses a groundwater source not under the influence of surface water. ---------CORRECT ANSWER----------------- Monthly What type of test is commonly used for testing fluoride levels? --------- CORRECT ANSWER-----------------SPADNS Test What type of test is most commonly used for testing chlorine residuals in a small system or in a distribution system ---------CORRECT ANSWER--------- --------DPD Test Sodium thiosulfate is added to a bacti sample bottle to? ---------CORRECT ANSWER-----------------Remove any chlorine residual from the sample Bacti. Sample bottle should be? ---------CORRECT ANSWER----------------- Build completely so no errors present in the bottle after the cap has been replaced To collect bacti. Sample The collector must be? ---------CORRECT ANSWER-----------------Trained in the proper collection procedures When collecting a bacti. Sample The lit of the sample bottle should be ------ ---CORRECT ANSWER-----------------Help bottom down with your fingers on the outside of the rim
Bacti. Samples must be analyzed no later than___________ hours after collection ---------CORRECT ANSWER----------------- 30 Testing for THM's can be performed ---------CORRECT ANSWER------------- ----By the IEPA lab or certain private certified labs A circuit breaker is used to ---------CORRECT ANSWER----------------- Automatically shut down on electrical circuit is overloaded to prevent damage What is the minimum combined chlorine residual that is required to be an all parts of a distribution system ---------CORRECT ANSWER----------------- 1.0 mg/l What is free chlorine? ---------CORRECT ANSWER-----------------The portion (in mg/l) of chlorine that remains in finish water after the demand for chlorine has been met What is total chlorine? ---------CORRECT ANSWER-----------------A amount of chlorine remaining after a given contact time What is the minimum free chlorine residual that required to be an all parts of the distribution system ---------CORRECT ANSWER-----------------.5 mg/l
Poly-pigging of a water main forms what purpose? Disinfected the water main, seals the inside of the main with a smooth coding, both, or neither? -- -------CORRECT ANSWER-----------------Neither What is a Ranney well? ---------CORRECT ANSWER-----------------A dug well with lateral screens which laboreisis it to under a nearby river What is well yield? ---------CORRECT ANSWER-----------------The amount of water that can be collected before given use from Wells for surface sources Grease should be added to a pump motor until______________? --------- CORRECT ANSWER-----------------New grease comes out of the grease club Copper service freezes solid in winter. What options does the operator have in thawing the line? ---------CORRECT ANSWER----------------- Electrical thawing A meter located in a mirror pit freezes in winter. what is the best option that the operator has in thawing the line ---------CORRECT ANSWER-------------- ---Use hot air heated obtained from the tailpipe of a vehicle What is the minimum flow velocity that hydrant should be flushed to adequately flush the line ---------CORRECT ANSWER----------------- 100 gallons/minute
Fire hydrants in Eleanor Maine are of the dry barrel type. Why does a dry barrel hydrant have to be completely opened when operating --------- CORRECT ANSWER-----------------To get the maximum flow from the hydrant and to run the water from flowing from the weep hole during use which can saturate the drainfield. The minimum vertical gap in an air gap should never be less than________________? ---------CORRECT ANSWER-----------------Twice the diameter of the discharge pipe All water towers, standpipes, and other types of vessels which store potable water are required to be airtight? ---------CORRECT ANSWER------- ----------No Performing a water audit can be beneficial to a public water supply by ______________? ---------CORRECT ANSWER-----------------Reducing water losses, improving the supplies financial status, and increasing the operators knowledge of the system.
