Water Distribution Exam Questions & Answers Correct 100%

Which is not a type of water right? a. Riparian b. Apparent c. Appropriative d. Prescriptive - Answer Apparent Which layer of a lake is considered "nutrient poor"? a. Epillimnion b. Thermocline c. Hypolimnion d. None of the above - Answer Hypolimnion Copper Sulfate is used in lake management to ____? a. Neutralize chlorine b. Control algae blooms c. Reduce turbidity d. None of the above - Answer Control algae blooms The Surface Water Treatment Rule requires that a. 3-log removal 99.9% for virus, 4-log removal 99.99% for Giardia b. 3-log removal 99.9% for Giardia, 4-log removal 99.99% for virus c. 3-log removal 99.9% for virus, 3-log removal 99.9% for Giardia d. there is no need for the removal of Giardia & virus - Answer 3-log removal 99.9% for Giardia, 4-log removal 99.99% for virus The process by which plants give off moisture into the atmosphere is called? a. Precipitation b. Condensation c. Evaporation d. Transpiration - Answer Transpiration An Appropriative Right is defined as what type water use right a. Correlative Right b. Reasonable Use Right c. Absolute Right d. Beneficial Use Right - Answer Beneficial Use Right A transmission main is a water main that ___? a. Has lots of service connections b. Is normally large in size c. Is normally small in size d. Has very little service connections e. Both B & D - Answer Both B & D: Is normally large in size/ Has very little service connections What well measurements must be known to calculate the specific capacity for a well? a. Static and water table b. Drawdown and discharge capacity c. Power input to the motor and pump efficiency d. Discharge pressure and head - Answer Drawdown and discharge capacity A map containing the size, location and ties off water mains; valves; hydrants; tanks and reservoirs is called a a. Road atlas b. Comprehensive map c. Components atlas d. Profile map - Answer Comprehensive Map Under the Safe Drinking Water Act, Lead Free means a. The use materials other than Lead b. The temporary use of lead under a lead replacement program c. Provided the use of lead in the system meets certain percentage levels d. Proof of solder free joints - Answer Provided the use of lead in the system meets certain percentage levels A device used to check flows in a distribution system is called a a. Pressure guage b. Poly pig c. Flow diffuser d. Piot gauge - Answer Pitot gauge Generally, a hydrant log should be kept whenever a hydrant is taken out of service. At a minimum the log should include a. Date and time when it was placed out of service b. Name of party contacted c. Date and time when it was returned to service d. All of the above - Answer All of the above The type of hydrant that has a wet-top whereby the threaded end of the main rod and operating nut are not sealed from water when the main valve is open is the ___ hydrant a. Dry-barrel b. Cory c. Compression d. Wet-barrel - Answer Dry-barrel Standard pumper-connection fire hydrants should not be installed on water mains smaller than ___ inches in diameter a. 4 b. 6 c. 8 d. 10 - Answer 6 The type of corrosion caused by the use of dissimilar metals in a water system is a. Caustic corrosion b. Galvanic Series c. Bimetallic corrosion d. Tubercular encrustation - Answer Galvanic Series In the distribution systems flows should not exceed a. 2.5 feet per second b. 3.5 feet per second c. 3.0 feet per second unless a fire condition exists d. 5.0 feet per second - Answer 5.0 feet per second The Nutating-Disc meter is classified as a ___ meter a. Compound b. Positive- displacement c. Propeller d. Velocity - Answer Positive-displacement A direct water connection to a boiler containing a highly corrosive scale prevention compound must be protected by a a. Pressure-type vacuum breaker b. Reduced Pressure Principal c. Air gap d. Double check valve assembly - Answer Reduced Pressure Principal A cross connection is defined as a connection between a. A potable water system and non-potable water system b. A high-pressure system and a low-pressure system c. Two different size pipes d. A cross on a water main - Answer A potable water system and non-potable water system An air-gap technique is used to a. Clean lines b. Let air in manholes c. Prevent backflow of non-potable water into drinking water supply d. Test for oxygen deficiency - Answer Prevent backflow of non-potable water into drinking water supply An approved device to prevent backflow and backsiphonage is a a. Gate valve b. Double check valve c. Surge tank d. Pressure Vacuum Breaker - Answer Double Check valve A tank containing industrial solvent is under constant pressure. An employee accidentally opens a valve that is connected to the potable water system. Pressure in the tank forces the solvent into potable water system. This is called a. Back pressure b. Backsiphonage c. Cavitation d. Water hammer - Answer Back pressure What is one major difference between a double check (DC) valve and a Reduced Pressure (RP) device? a. An RP device is used for non-toxic substances and a DC is used for toxic substances b. An RP device is used for toxic substances and a DC is used for non-toxic substances c. There is no difference between the two valves. Both offer equal protection against back flow conditions. d. The RP device works best under a backsiphonage condition and the DC device works better when there is back pressure. - Answer An RP device is used for toxic substances and a DC is used for non-toxic substances A cross connection prevention program is a. A voluntary program over seen by the water utility b. The responsibility of the water utility c. The responsibility of the business owner d. A shared responsibility by the utility and the business owner - Answer A shared responsibility by the utility and the business owner