Water distribution d1 and d2 Exam Graded A+

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Wet tap - ANSWER A connection made into a main that is full or under pressure is a Cross connection - ANSWER A connection between a safe and an unsafe water supply is called a Is available for u ... se without causing shortages during dry periods - ANSWER Safe yield of a water source is the quantity of water which: Rate of flow of water - ANSWER A Venturi tube increases the velocity and decreases the pressure as water flows through it. This type of tube is used to measure the: Underground strata of water - ANSWER Aquifer is a type of 10 percent - ANSWER In a well managed metered distribution system, unaccounted-for-water should not exceed 35 psi - ANSWER According to AWWA guidelines, during a fire,water pressure should not drop below 20 psi. What is the AWWA recommended minimum water pressure in a distribution system, under normal flow conditions, excluding fire flow? Closed slowly to reduce surges - ANSWER After using a hydrant, the hydrant should be: 15-20 ft - ANSWER For a centrifugal pump in good condition, the practical suction lift is. Acidic - ANSWER PH reading of 5.0 indicates the water sample is Ten drops per minute - ANSWER When using a centrifugal pump, the packing glands around the shaft should be checked daily, water leakage from the packing gland should be approximately Horizontal 10 ft, vertical 1 ft - ANSWER Water and sewer line are installed parallel to each other underground in trenches. The following minimum, wall to wall, separation must be provided: Stains plumbing fixtures and laundry - ANSWER The source of water containing iron and manganese is usually groundwater. This water: Under registers the amount of water delivered - ANSWER As a water meter becomes worn with use it tends to: Rotten eggs - ANSWER Hydrogen sulfide gives off ___________ odor Calcium and magnesium - ANSWER Hardness is caused by Causes teeth to become mottled - ANSWER Water containing excess fluoride Meters - ANSWER Devices used to measure water flow are called Purple - ANSWER The color of pipe carrying recycled water to irrigate a golf course Contamination of the system by back siphonage - ANSWER Fire fighting may cause the low pressure in an area of a distribution system. The low pressure might lead to: Iron - ANSWER Red water problems are due primarily to: 0-14 - ANSWER PH range is: Flush the eyes with a lot of water for approximately 15 minutes - ANSWER If your eyes are exposed to chlorine, you should: Take three repeat samples - one from the same location, one upstream and one downstream - within 24 hours - ANSWER The first time a bacteriological sample report comes back marked unsafe, you should 1.0 - ANSWER One PPM is equal to ___ mg/l All of the above: Chemical processing plant, hospitals, wastewater treatment plant - ANSWER A backflow prevention device is required on the water service line which serves 5 feet - ANSWER Per OSHA regulations trench must be shored if it is ______ deep, or deeper All of the above: incorrect installation, misjudgment of soil conditions, Heavy loads or failure to consider change in weather - ANSWER The shoring systems sometimes fail due to Nutating disc meter - ANSWER Which of the following meter is commonly installed in a single family, residential, homes No more than 12-inches above the floor - ANSWER The outlet of a forced ventilation system for a chlorinator room should be located: Pressure-reducing - ANSWER Which of the following valves should be used when it becomes necessary to supply water at different pressure zones Sodium ions - ANSWER A water softening unit will exchange calcium and/or magnesium ion with De-energized, locked out and tagged out - ANSWER When any piece of electrical equipment is being worked on, the circuit breaker should be To ask the companies to locate and mark the location of all utilities in the area of the repair job - ANSWER Why should operator contact "USA" or "Dig Alert" before starting an underground repair job Continuously - ANSWER During a confined space entry, how often should the confined space be monitored for hazardous atmosphere? Are sterilized by the laboratory and ready to use when received - ANSWER Sample bottles which are furnished by a certified laboratory for collection of bacteriological samples Filled carefully to about an inch from the top - ANSWER A bacteriological sampling bottle should be Total and free chlorine in the water - ANSWER A DPD test is used to measure 40 lbs - ANSWER How many lbs. of chlorine gas per day can be withdrawn from a 150 lb cylinder operating at normal room temperature? Water very high in mineral content - ANSWER The use of a well supply as a source normally results in: Percolation - ANSWER Movement of water through the ground is called Suction - ANSWER The inlet into a pump is generally called The quantity of water that can be taken from a source of supply over a period of years without depleteing the source permanently (beyond its ability to replenish in wet years) - ANSWER Maximum safe yield of a water source is defined as: Impeller - ANSWER The rotating element in a centrifugal pump is commonly called a(n): Replace air with water inside the pump - ANSWER Pumps are primed to: Staggered - ANSWER The joints in the rings of pump packing should be: [Show More]

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