Water Distribution D2 California Practice Test 2024 Questions and Answers, Exams of Water Resources Planning and Management

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Water Distribution D2 California Practice

Test 2024 Questions and Answers

The Difference between the static ground water level and the pumping level is the - ANSWER-drawdown A customer complaint about the presence of brown floc in tap water can best be handled by - ANSWER-investigating the problem as soon as possible The term "aquifer" relates to which one of the following? - ANSWER-groundwater One indication of corrosive water is a high concentration of - ANSWER-Carbon dioxide Catholic protection means protection against - ANSWER-Corrosion The primary reason for the use of a dry barrel fire hydrant is to - ANSWER-keep the hydrant from freezing The component parts of a well include all of the following except - ANSWER-pressure switch At the same barometric pressure, the amount of dissolved oxygen in cold water tends to be ............ the amount of dissolved oxygen in the warm water - ANSWER-more than Which of the following is the principal constituent in water that causes corrosion of metals? - ANSWER-dissolved oxygen Which component of a centritugal pump moves the water? - ANSWER-impeller A record containing the size, location, and ties of water mains; valves; hydrants; tanks; reservoirs; and pump stations is called a - ANSWER-comprehensive map What term describes water that is suitable for drinking - ANSWER-potable a pump delivering 288,000 gallons of water in 24 hours operates at what average flow rate? - ANSWER-200 gallons per minute Velocity of flow in mains is usually expressed in terms of - ANSWER-Feet per second A competent person at an excavation work site - ANSWER-Is capable of identifying hazarda and has the authority to take corrrective measures.

Hydrogen sulfide gas smells like - ANSWER-rotten eggs which of the following methods can be used to renove high iron content from a well supply? - ANSWER-oxidation and filtration. Hardness may be expressed in - ANSWER-Milligrams per litre as CaCO The basic unit of electrical power is the - ANSWER-Watt A standpipe is 84 inches in diameter and 20 feet high. How many gallons are in the standpipe when the water is 16 feet deep? - ANSWER-4, Check valves are used to - ANSWER-permit flow in only one driection Standard pumper connection fire hydranta should not be installed on water mains smaller then ----inches in diameter. - ANSWER- Beards or long sideburns prohibit an operator from safely - ANSWER-wearing the face mask of a self contained breathing apparatus. The water table is defined as the - ANSWER-upper surface of the groundwater. The shaft speed of an electric motor is most commonly expressed in units of - ANSWER-revolutions per minute A coupon test installation in a distribution system is used to - ANSWER-determine the rate scaling or corrosion. Disease causing bacteria are know as - ANSWER-pathogenic Normally, surface water and groundwater have a PH range of - ANSWER-6.8 to 8. Which is the best definition of turbidity in water? - ANSWER-anything in water that scatters light A competent person must inspect excavations and adjacent areas for hazards - ANSWER-daily, prior to the start of work, and as needed throughout the shift. The component of a centrifugal pump sometimes installed on the end of a suction pipe to hold the priming is known as a - ANSWER-foot valve The principal purpose of an altitude valve on an elevated tank is to - ANSWER-control maximum filling level in distribution storage. The term primacy means the - ANSWER-authority by the states to supersede the USEPA drinking water regulations.

Reciprocating positive displacement pumps are also known as - ANSWER-Piston pumps Modertely hard water will have a hardness range of ----- mg/L as - ANSWER-61 to 120 A common method for removing hydrogen sulfide from water is - ANSWER-aeration The treatment process designed to kill pathogenic organisms is - ANSWER-disinfection Lead in drinking water can result in - ANSWER-impaired mental functioning in children. A disease that might be transferred to a new victim through water is - ANSWER-typhoid An average percentage range for unaccounted for water in a fully metered system is - ANSWER-11 to 15% A cross connection is defined as a connection between - ANSWER-a potable water system and nonpotable water system. Backsiphonage is caused by - ANSWER-partial vacuum in the line. Five milligrams per litre equals ----- parts per million - ANSWER-5. When the pumping rate is increased, the effect on the cone of depression is to - ANSWER-lower the pumping level Which chemical is most often used to disinfect public water supplies? - ANSWER- chlorine or chlorine compounds. The purpose of a surge tank is to - ANSWER-control water hammer. The presence of total coliforms in drinking water indicates - ANSWER-THe potential presence of pathogens. The term MCL means - ANSWER-maximum contaminant level. The primary origin of coliforms in water supplies is - ANSWER-fecal contamination by warm blooded animals. The primary source of trihalomethanes (THMs) in drinking water is - ANSWER-the reaction of chlorine compounds and organic matter. An air- gap device is used to - ANSWER-prevent backflow of nonpotable water into a drinking water supply.

The primary health risk associated with trihalomethanes (THMs) is - ANSWER-cancer. The purpose of the fusible plug on a chlorine tank is to - ANSWER-Prevent the cylinder from exploding at high temperatures The primary health risk associated with synthetic organic compounds (SOCs) is - ANSWER-Cancer Which is the most accurate statement concerning potable water lines? - ANSWER-They must never be connected to a contaminated water source. The primary source ofof synthetic organic compound (SOC) contamination in water supplies is (are) - ANSWER-industrial solvents and agricultural pesticides. Water samples are analyzed for the coliform group of bacteria because these bacteria - ANSWER-indicate the possible presence of disease causing organisms. Lead in drinking water is primarily the result of - ANSWER-corrosion within the distribution system and residential plumbing. Pressure in a pipeline may be affected by - ANSWER-friction and elevation. What is the different between a maximum contaminant level (MCL) and a secondary maximum contaminant level (SMCL) - ANSWER-MCLs relate to health effects, while SMCLs relate to aesthetic concerns The purpose of an electrical lock out device is to - ANSWER-positively prevent the operation of an electrical circuit. The maximum contaminant level goal (MCLG) of known or probable carcingens is - ANSWER-zero A public water system must comply with safe drinking water act (SDWA) regulations based on - ANSWER-all of the above An objectionable feature of iron and manganese in water is - ANSWER-staining of fixtures. The pressure that a pump must operate against is measured in - ANSWER-pounds per square inch If the speed of a centrifugal pump is increased, and the head remains the same, the gallons per minute output will - ANSWER-increase A suspension of very minute particles that cause an appearance of cloundiness is called

• ANSWER-turbidity.

The diameter of a cylindrical tank is 10 feet. If filled to a depth of 10 feet, it will contain appoximately how many gallons of water? - ANSWER-5, How many cubic yards of earth are excavated if you dig a trench 3 feet wide, 9 feet deep, and 1,200 feet long? - ANSWER-1, Hardness i n water is caused by - ANSWER-calcium and magnesium. Contaminant monitoring requirements can depend on - ANSWER-all of the above Sodium hypochlorite is - ANSWER-a compound that can be purchased in liquid solution and can be used for disinfection. The abbreviation DO stands for - ANSWER-dissolved oxygen High nitrate concentrations in water can affect - ANSWER-infanta. A corporatio stop is used to - ANSWER-connect the service line to the water main under pressure.