1.5, normal Distribution systems are usually laid out in _ and/or circular designs. 50, 24 When pressure testing the water main, the test pressure should be _times as great as the _ operating pressure. 5, 10 When disinfecting a water line, use _mg/L of chlorine in the main and let stand for _hrs. availability, cost 5/8 meters need to be tested at least every _ to _ yrs. rates, direction Electricity is the preferred power source for most distribution systems because of _, reliability and relatively low _. breakaway Controlling valves regulate pressure flow _ and flow _. dry barrel Hydrants have a _ point in case the hydrant is struck by a vehicle. gate valve The most commonly used fire hydrants used in distribution systems are the _. positive displacement Safe withdrawal weight from a 150lb cylinder is _lbs and 400lbs from a _ton cylinder. gooseneck The most common type of water meter is the _ _ meter. increases, decreases The operator should leave a _ of slack in flexible tubing. less, 19.5 Characteristics of a Centrifugal Pump:Īs the head _ the discharge _. 25 An oxygen deficient atmosphere is defined as one which contains _ than _ % oxygen. coliform Ladders should be placed every _ft in a ditch. 5 A written sample writing plan is required for _ monitoring. tuberculation Shoring should be used if a ditch is _ft or deeper. concrete A general deposit of mineral particles evenly along the inside of the pipe is _. working pressure _ is used to anchor pipe bends. water hammer, sudden change The _ water pressure required by the rules and regulations is _psi under any and all conditions. friction loss, c factor _ occurs whenever there is a _ in the velocity or direction of water flow. air gap, tceq _ on a pipeline depend on the _ or coefficient of pipe roughness. cathodic, corrosion The _ is the only cross connection control method approved by _. 80, service connection _ protection is the electrochemical method for preventing _ of metal tanks. outside the house A standpipe is considered ground storage unless it exceeds _ft above the highest _. 1000 The most common collection point for a bacti sample is the water tap _. never A bacti sample should be taken every _ft of pipe. 5 Public opinion of the water utility is _ at a standstill. 2 The following minimum residuals is _mg/L for free chlorine and _mg/L for total chlorine.2. 2.5 90% of underground pipe failures are related to improper backfill and bedding The spoil bank should be located at least _ft away from the ditch.

30 Color in the water supply should be less than _ units. Bacti samples have to be returned to the lab within _hrs of the collection time.

Class c license illinois test questions