Water distribution practice test D1 /D2 questions and answers already passed

Water distribution practice test D1 /D2 questions and answers already passed The only absolutely reliable method of backflow prevention is the use of ✔✔Air Gap The bubbles formed in a positive multiple tube fermentati ...

Water distribution practice test D1 /D2 questions and answers already passed The only absolutely reliable method of backflow prevention is the use of ✔✔Air Gap The bubbles formed in a positive multiple tube fermentation test are ✔✔Carbon Dioxide The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is ✔✔40 lbs If you encounter a liquid chlorine leak in a one tone container, what action should you take first, to reduce the severity of the leak? ✔✔Rotate the container to place the leak at the top The most commonly used water disinfectant in the United States is ✔✔Chlorine When collecting a distribution system sample, the water should be allowed to run for a period of time prior to sample collection. How long ✔✔As long as necessary to permit cleaning of service line Sample bottles wich are furnished by a certified laboratory for collection of bacteriological samples ✔✔Are ready to use The difference between water pressure upstream and downstream of a pump when it is not in operations is know as the ✔✔Total static head A device that automatically shuts off flow in an elevated storage tank when the water level in the tank reache a preset level is termed a ✔✔Altitude valve In an occupied trench requiring personal egress what is the maximum allowable distance between a worker and an exit letter ✔✔25 feet A water bearing formation in the soil is referred to as ✔✔An aquifer The distance between the static water level and the pumping water level is termed the ✔✔Drawdown To prevent the entry of surface contamination into a well is the purpose of ✔✔Sanitary seal The presence of coliform bacteria in a distribution system ✔✔Indicates that pathogenic organisms may be present also The most common valve type in water distribution system is the ✔✔Gate valve A Venturi is a device used to ✔✔Measure water flow Backspin is occurring after well shut down this indicates ✔✔A faulty check valve A ph reading of 6.0 units indicates the water sample is ✔✔Slightly acidic Chlorine gas ✔✔Is heavier than air The change in what're demand during the course of a day is called ✔✔Diurnal variation Catholic protection is a system used for ✔✔Metallic corrosion inhibition The elevation of the free surface in a water table well wich is not running is called ✔✔Static water level The maximum momentary load placed on a water supply system is known as ✔✔Peak demand Most below ground level storage tanks are constructed of ✔✔Concrete Hey bacteriological sampling bottle should be ✔✔Filled carefully to leave a small air space When fully open, wich of the following will have the lowest friction loss ✔✔Gate valve Enclosed, open, and smi closed are terms used for the designation and selection of ✔✔Impellers The process by wich water changes from the gas to the liquid form is called ✔✔Condensation Sleeve type and victaulic couplings are the most common forms of ✔✔Mechanical couplings The most commonly used meter on a small diameter domestic service is the ✔✔Mutating disc meter If a pump sounds like it's pumping rocks, the most likecly cause is ✔✔Cavitation "Backflow Device" is termedused to describe a device that ✔✔Prevents back flow of potentially contaminated source in to drinking water Which is a devices used to measure flow ✔✔Weir When closing a hydrant, it should be ✔✔Closed slowly to reduce surges A bacteriological test that measures only the presence or absence of Califorms is ✔✔Colilert A compound meter is a device which ✔✔Provides accurate reading over a wide range of flows The rotating element in a centrifugal pump is commonly called the ✔✔Impeller The packing gland serves many functions in a centrifugal pump. Among these is ✔✔Keep gritty material from entering the packing box What are the names of positive displacement pumps ✔✔Reciprocating and rotary What is the practical maximum suction lift for a centrifugal pump in good working condition ✔✔15 to 25 feet Residual chlorine refers to ✔✔The amount of chlorine in the chlorinated water after a selected time The lowest point of the inside of a pipe is known as the ✔✔Invert If possible why should a main water leak be repaired under pressure ✔✔To prevent contamination of the water line A connection made in to a main that is full or under pressure is called a ✔✔Wet tap Shoring is normally required for trenches of that minimum depth ✔✔5 feet Standard first aid procedures direct that the first step to control bleeding is to ✔✔Apply pressure directly to the wound First aid for a first degree burn is to ✔✔Submerge the burned area in cold water Chlorine leak can be detected by ✔✔Applying ammonia vapor Red water problems are due primarily to ✔✔Iron Portable water is defined as ✔✔Any whater that according to recognized standards is safe for consumption When testing a distribution system for chlorine samples residuals , you shoul ✔✔Test samples from several points A normally burried valve located on a street water main and leading to water service is known as ✔✔Corporation Stop A new water main should be flushed disinfected at 50mg/L and held at above 25mg/L for at least ✔✔24 hours What percent of all the earths water is readily available as potential drinking water in the form Of lakes, rivers, and ground water? ✔✔0.34 What gass kills the sense of smell ✔✔Hydrogen sulfide Pipe with a "C" factor of 140 is regarded as having an ✔✔Extremely smooth interior Pumps are primed to ✔✔Replace air inside the pump with water The drain hole in a dry barrel fire hydrant is designed to ✔✔remove water from the riser to prevent freezing An aquifer that is located underneath an aquiclude is called ✔✔A confined aquifer Odors are not as noticeable when the water is ✔✔Cold the freezing point of water is ✔✔32*F. Or 0*C