Water Distribution 4 better- Questions and Answers 100% Correct., Exams of Water Resources Planning and Management

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Water Distribution 4 better- Questions

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How are valves checked to determine that they are holding properly? - ANSWER-by a pressure test Who is ultimately responsible for being sure that your agency has a good record keeping system? - ANSWER-Supervisor Which type of pipe is most likely to be damaged by corrosion? - ANSWER-Steel What is the most important and all inclusive aspect of supervision? - ANSWER-proper utilization of all resources The maxium flow to be expected through a standard 5/8 x 3/4 meter is ____ gpm. - ANSWER-20 gpm What does not materially affect the friction loss in a given length of pipe? - ANSWER- hardness of water Because of local climate conditions, a system may have a specific type of fire hydrants installed, such as - ANSWER-dry barrel or wet barrel One opening has become available that would be an advancement to any one of three qualified eager employee. How should this situation be handled? - ANSWER-Talk to all three as a group, explain the situation, and make your selection. Then notify all personnel of the change. A decrease in the gallons of pumped a well per kilowatt hour of electricity used indicates a... - ANSWER-decrease in well efficiency Objectives for a preventive maintenance program include... - ANSWER-reduce emergency repairs and maintenance Which one of the following ins unlikely to occur in the distribution system? - ANSWER- increase in dissolved gasses To be sure a dry barrel hydrant is draining after the test is completed... - ANSWER-feel for a suction through the nozzle Air tanks on storage tanks require... - ANSWER-mesh screens to prevent entry of animals or birds

In a parallel circuit, if one unit is burned out or disconnected, the other units will... - ANSWER-continue to function Automation of a water system should provide... - ANSWER-constant pressure The two major requirements in sizing a service area adequate... - ANSWER-pressure and flow rate The least head loss in a pipeline would be caused by a fully open... - ANSWER-gate valve The location where residual pressure is measured should be... - ANSWER-at the nearest hydrant upstream from the flowing hydrant A reduced pressure zone back flow preventer will... - ANSWER-stop backpressure and backsiphonage When excessively worn, positive displacement and other meters will usually... - ANSWER-register less water than actually passed When a confined space must be entered, the minimum number of workers on the ob should be... - ANSWER-three Plastic service lines can be thawed by... - ANSWER-hot water When working with electrical equipment outdoors... - ANSWER-a ground fault interrupter power supply is required An organization chart shows... - ANSWER-the formal organization, including the overall structure How can the supervisor be certain that scheduled maintenance is completed? - ANSWER-use a form that compares work assigned with work completed The most important thing a supervisor can do regarding potential personnel problems is to... - ANSWER-write each incidence down, file it for reference, and talk to the personnel involved What is the main reason for the poor accident record of operators? - ANSWER-lack of training The major reason why the person in charge of a public relations program should be a member of upper management is... - ANSWER-the ability to influence policy

Leadership occurs as a result of... - ANSWER-the supervisor's ability to achieve employee willingness to follow Occasionally some of the people on a work crew will indulge in active horseplay. This should be... - ANSWER-stopped immediately because it is likely to cause an accident Two ways to reduce the chances of freezing in a water tank are... - ANSWER-vary the water level and lower the maximum water level Two constituents that should regularly sampled and tested from the distribution system are... - ANSWER-coli-form bacteria and chlorine residual Areas subject to higher than normal vandalism are usually... - ANSWER-secluded out of the way buildings Word has just come down from the top that operating funds are being cut. How should this be handled? - ANSWER-Let the other personnel know what the situation is and ask for their help Where no yoke is used, an operator preparing to remove a service meter should... - ANSWER-install a jumper wire and take care not to bridge the circuit with their body If your were in charge of a large operation with four foreman, three whose work was exceptionally good and a fourth who was substandard, what should you do? - ANSWER-Tell the person of the shortcomings that bother you and offer to help the person before any other action is taken If an older system with excessive tuberculation exhibited persistent red water problems, it would be advisable to... - ANSWER-clean the mains before attempting to apply a protective coating with the stabilization treatment process In establishing permanent "ties" pr references to a buried valve, what is the poorest referenece point from which to measure? - ANSWER-tree The possible corrosive action of a filtered water upon metals can be detected by the... - ANSWER-measuring of pH and pHs An operator is caught in a room where chlorine gas is leaking. IF the operator does not have a mask, what should the operator do? - ANSWER-Keep mouth closed, keep head as high as possible and quickly walk out of the room, holding breath if possible One of the employees in your crew complains about having to do a hard job. The proper thing to do is... - ANSWER-explain that all employees must do their fair share of the hard work as well as the easier tasks

When an employee refuses to observe safety requirements because the employee "has learned over the years that they are useless," what action should the immediate supervisor take? - ANSWER-initiate immediate disciplinary action The most critical safety precaution when electrical thawing is... - ANSWER-check that no current strays from the service line to the water main and beyond A foreman's monthly report should include... - ANSWER-number of complaints received and investigated The customer's most memorable image of a utility is often... - ANSWER-the actions of the distribution field personnel If galvanized iron fittings are connected to copper pipe in moist fround, you would expect which of these to occur first? - ANSWER-the galvanized iron will corrode You are getting complaints of stale water in a part of your stsem that is not looped. The temporary solution to this problem is to... - ANSWER-flush hydrants. Cathodic protection systems for tanks commonly use sacrificial anodes and... - ANSWER-a direct current power supply Two important considerations in location storage are enviromental impact and... - ANSWER-maintaining system pressure Some wells produce excessive amounts of sand in the water. There are some operating procedures that a re helpful in over-coming this problem. One procedure is to reduce the pumping rate and the procedure is to pump the well... - ANSWER-continuously for long periods To properly train a new employee, you should... - ANSWER-pace carefully the amount of new material you give the employee to learn At the same flow, friction losses through a 12-inch line will be... - ANSWER-less than through a 6-inch line To test a 110 V/AC is hot, set volt-ohm meter for... - ANSWER-250V/AC job specifications refers to... - ANSWER-the principal duties and functions of various jobs, including the scope and kinds of authority related to these jobs. Which is the correct type of valve for controlling the level of a treated water storage reservoir that is below the level of hydraulic gradient? - ANSWER-altitude valve All water distribution systems should have a ____that designates all arterial water mains, valves and hydrants. - ANSWER-comprehensive map

The most common problem with ductile iron pipe is... - ANSWER-cutting the pipe The recommended distance of horizontal separation of water mains and sewer lines is ____ ft. - ANSWER- Disaster planning is... - ANSWER-a good training technique Increased fund for the year are limited. However 2 or 3 outstanding newly employed individuals are grossly underpaid for their services. How should this situation e handled? - ANSWER-Call a staff meeting, explain the situation, and then raise their salaries. What is the relationship between pH and effective chlorine residual? - ANSWER-the higher the pH, the lower the effective chlorine residual Saddle taps should be used when? - ANSWER-connecting plastic to iron pipe Where is possible contamination most likely to occur? - ANSWER-Spring formations located in clay type soils How do compression type dry barrel hydrants open? - ANSWER-Against the flow of water in the show of the hydrant Why should you fully open a dry barrel hydrant? - ANSWER-to prevent damage to interior fittings and closure device What tool do you use to check water flowing from a hydrant in a distribution system? - ANSWER-pitot gauge A mole used to avoid open cut excavations and to install water services uses the following to operate: - ANSWER-compressed air The use of chloramines as a disinfectant is helpful in some distribution systems as it... - ANSWER-lowers the occurrence of trihalomethanes (THMs) When testing a backflow prevention device, how are the test cocks numbered? - ANSWER-by direction of flow from 1 up to 4 During corrosion caused by stray current, the cathode attracts charges that have... - ANSWER-negative charges If you are providing a consecutive system using free chlorine with water that is disinfected with chloramines, the system receiving the water should make sure... - ANSWER-they adjust the amount of ammonia to combine with free chlorine

The most effective method of implementing a safety program for all employee is to... - ANSWER-allow employees to implement the program When an acid solution is added to a basic solution it produces... - ANSWER-a neutral solution Rate the types of soils from loose to cohesive: - ANSWER-Layered soil, sandy loams, non-fissured sandy clay Analog signals use similar ______ data whereas digital signals utilize _____ data over short time periods - ANSWER-continuous, packets of The arrangement of pumps in parallel is typical used... - ANSWER-to increase flow Disadvantages to steel pipe are... - ANSWER-potential for both internal and external corrosion Friction head loss can be calculated using tables based on... - ANSWER-the Hazen- Williams formula Water behind a dam and above a water treatment plant has energy by virtue of its elevation. This difference in elevation is called elevation head or... - ANSWER-potential energy Although velocity head can usually be ignored, it should be considered when it is ____ to ___ percent of the pressure head. - ANSWER-1 ; 2 Which organisms have the greatest resistance to chlorine? - ANSWER-Nematodes Which is the maximum residual for chlorine dioxide to avoid taste and odor complaints?

• ANSWER-.04 to .05 mg/l Gaseous chlroine dioxide is generated from... - ANSWER-sodium chlorite + chlorine at low pH values Which is the most probable solution if sulfur bacteria are causing corrosion in the distribution system? - ANSWER-routine use of disinfectant and penetrate If special bedding material is required by the design engineer due to poor local soil conditions, the material should not contain granular material greater than... - ANSWER- 1 inch How much will a flexible disk coupling compensate for in parallel misalignment? - ANSWER-1/32 inch

Which will a flexible diaphragm coupling compensate for in angular movement? - ANSWER-4 degrees When a pressure reducing and a pressure sustaining valve are used in combination, one valve can keep a constant (blank) pressure even with fluctuating demand, while the other valve holds the pressure at a minimum predetermined (blank)... - ANSWER- downstream; pressure If backsiphonage occurs with a reduced-pressure device and the pressure drops below 2 psi, which process will occur? - ANSWER-the relief valve will remain fully open and an air gap (atmospheric pressure) will form between the check valves, closing them both The lowest pressure point in the pump is the... - ANSWER-center of the impeller The shaft's main function is to transmit _____ from the motor to the impeller. - ANSWER-torque Which is the range of specific speeds for a propeller pump? - ANSWER-9,000 to 15, rpm A vertical turbine pump would most likely have a specific speed of... - ANSWER-3, Which is the most common cause for surges in the distribution system? - ANSWER- Power failure shutting down a pump suddenly Which are the basic components of every telemetry system? - ANSWER-Transmitter, transmission channel and reciever The anodes placed in a water storage tank for cathodic protection usually last ___ years, and should be inspected every ___... - ANSWER-20 years; year In general, the current drawn by a motor the instant it is connected to the power source, called the locked-motor current, is usually how many times the normal full-load current of the motor... - ANSWER-2 to 3 times Most telemetry equipment transmit information by... - ANSWER-digital signals Control systems consist of the following distinct components: - ANSWER-signal conditioners, actuators, control elements, and indicators Who should inspect the work of a water storage painting contractor? - ANSWER- qualified third party Aviation warning lights on water storage tanks have an FAA regulation that requires the bulbs to be replaced before they reach what percentage of their normal life expectancy?

• ANSWER-75%

The most expensive part of a pipe installation is the... - ANSWER-excavation Potential biological biotoxin threat? - ANSWER-ricin The IDLH value for chlorine, set by OSHA is - ANSWER-10 parts per million