Water Distribution Practice Exam: Grade 3 & 4 Tempe, AZ, Exams of Water Resources Planning and Management

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Water Distribution Practice Exam Grade

3 & 4 Tempe, AZ with Complete

Questions and Answers 100% Correct.

What is the definition of "operator"? - ANSWER-Operator has the same meaning as certified operator. Within how many days must a certified operator notify the Department (in writing) that the operator either ceases or commences operation of another facility? - ANSWER- days At which type of facility is a remote operator allowed to operate? - ANSWER-Any Grade 1 or Grade 2 facility How close must the remote operator of a facility be to the facility to legally operate the facility? - ANSWER-Within 200 miles by ground travel. What is the inspection frequency that a remote operator must inspect a grade 1 or grade 2 water treatment plant or distribution system that produces groundwater? - ANSWER-As often as necessary, but no less than monthly. Upon expiration of an operator certificate, how many days does an operator have to reinstate the certificate without retaking an examination? - ANSWER-90 days What is an initial monitoring year? - ANSWER-The calendar year designated by the Department within a compliance period in which a public water system conducts initial monitoring at a point of entry. What is the reporting limit for all regulated VOC's? - ANSWER-0.0005 mg/L Who is allowed to conduct a sanitary survey? - ANSWER-A representative of the Department or a professional engineer or sanitarian who is registered in Arizona and approved by the Department. Under what circumstances may the Department reduce monitoring frequency for nitrate at a surface water sampling point and what is the reduced frequency? - ANSWER-If the analytical results are < 5 mg/L for 4 consecutive quarters then reduce sampling frequency from quarterly to annually. Which type of system is not required to sample for VOC's? - ANSWER-Transient Non- community Water System.

What contaminants does the monitoring assistance program monitor? - ANSWER-IOCs, VOCs, and SOCs. What types of public water system must comply with Article 6, Capacity Development Requirements for a New Public Water System? - ANSWER-Community water systems and non-transient non-community water systems that begin operations on or after October 1, 1999 To become a new public water system, an owner shall file an elementary business plan for review and approval by the Department. What three elements make up the elementary business plan? - ANSWER-Technical Capacity, Managerial Capacity, and Financial Capacity. What is the definition of an "on-site representative"? - ANSWER-On-site representative means a person located at a facility who monitors the daily operation at the facility and maintains contact with the remote operator regarding the facility. According to Arizona State Rule, an "Air-gap separation" means a physical separation between the discharge end of a supply pipe and the top rim of its receiving vessel, which has a separation distance equal to at least? - ANSWER-1 inch or twice the diameter of the supply pipe, whichever is greater. According to Arizona State Rule, this term means 1 of the family of organic compounds, named as derivatives of methane, wherein 3 of 4 hydrogen atoms in methane are substituted by a halogen atom in the molecular structure? - ANSWER-Trihalomethanes According to Arizona State Rule, what term best represents a mechanical device used to prevent back-flow? - ANSWER-Back-flow-prevention assembly This type of valve has a movable disk the same size as the full diameter of the pipe. The disc rotates on a spindle or shaft in only one direction to either block or allow the flow of water. - ANSWER-Butterfly The four most common categories of valves encountered in the water distribution system are the? - ANSWER-Slide, rotary, globe, and diaphragm valves. This type of valve has a flexible piece inside the valve's body and can be adjusted up or down using an attached stem. When the piece is depressed, the flow of water can be stopped or regulated. - ANSWER-Diaphragm _______________ may be located below the ground surface and are often made of concrete. They must be protected from contamination and unauthorized entry. - ANSWER-Clear Wells

Which one of the following is correct concerning elevated tanks? - ANSWER-Eliminate the need for continuous pumping. Pump stations are not always located in the same place as the storage facility. Under these conditions, a signal must be transmitted from the storage facility to the pump or pumps. Also some type of indicator showing the level of water in the storage facility to the pump or pumps. Also some type of indicator showing the level of water in the storage facility is desirable at the pump station. ________________ sensors are available that can measure the actual water surface level and start or stop a pump. Calibration of these devices consists of dialing a set point to the desired start or stop water surface level for a pump. - ANSWER-Solid state electronic. A water storage tank interior coating will generally protect the interior for approximately how many years? - ANSWER-3-5 years. How far above ground does a Double Check Back-flow assembly need to be installed? - ANSWER-12 inches. Atmospheric and pressure vacuum breakers are usually found on? - ANSWER-Irrigation systems Which back-flow device/assembly/method is to be used that ensures the greatest degree of back-flow protection? - ANSWER-Air Gap. What is the difference between a reduced pressure principle back-flow assembly and a double check back-flow assembly? - ANSWER-The RP has a relief valve. What is the maximum time period between having a certified back-flow tester test your back-flow assemblies or devices? - ANSWER-1 year. A back-siphonage condition will most likely be the cause of? - ANSWER-Reduced pressure or negative pressure on the service or supply side. How should you or in which order should you place the shoring equipment in a trench? - ANSWER-Starting at the top move to the bottom of the trench and reverse to remove it. When working in a trenching excavation, you must place a ladder so that an employee in never more than __________ from the ladder. - ANSWER-25 feet This term is used for the process of advising motorists and pedestrians as to detailed requirements or conditions affecting road use at specific places and times in order that proper action may be taken and accidents or delays avoided. - ANSWER-Traffic Control While excavating, you must place the spoil at least __________ feet from the edge of the hole. - ANSWER-

Whenever distribution system work tears up a sidewalk or other walkways, the primary concern should be? - ANSWER-Protecting pedestrians. Why should an operator handle sodium hexametaphospate with caution? - ANSWER- Very sharp and can cut the operator. Ladders and climbing devices should be inspected periodically by qualified individual on a routine schedule. These inspections should be made? - ANSWER-Once a year. Which of the following statements concerning confined space entry is FALSE? - ANSWER-Operators must wear SCBAs Which of the following preparations should be a primary concern before cleaning and painting a water storage facility? - ANSWER-Adequate water storage provisions are made. Which of the following is NOT a type of water storage facility? - ANSWER-PTO Tanks Care should be taken when draining underground or in-ground water storage tanks because? - ANSWER-The tank may shift or "float" A Double Check Back-flow assembly can provide effective protection of? - ANSWER- Back-siphonage of low or pollutional hazards, and Back-pressure of low or pollutional hazards Which of the following is a routine maintenance procedure for a pressure-reducing valve? - ANSWER-Exercising the valve A disadvantage of centrifugal pumps is? - ANSWER-They are generally not self-priming Pump cavitation can be caused by? - ANSWER-A clogged suction line What is the purpose of a foot valve on a pump? - ANSWER-It keeps the pump primed According to Arizona State Rule, what does HPC mean? - ANSWER-Heterotrophic Plate Count What is the recommended procedure for shutting down a large centrifugal pump? - ANSWER-Slowly close the discharge immediately before the power is shut off. If the shaft sleeve has been worn, the operator can say that the _______________ has caused the sleeve to score or fret. - ANSWER-Packing Water at a desirable temperature that is free from objectionable tastes, colors and turbidity is known as? - ANSWER-Palpable

The best definition of an ion is? - ANSWER-An electrically charged atom When pumping water from a tank, a vortex may be formed. What is a vortex? - ANSWER-Revolving water that forms a whirlpool The metabolism and growth of microorganisms in water supplies are affected most by?

• ANSWER-Temperature Employers must provide operators with a copy of the _______________ upon request and also train operators to work safely with the hazardous substances that are encountered in the workplace. - ANSWER-MSDS Which of the following terms best describes the following definition: An effective _______________ program means less time spent on corrective maintenance, resulting in better planning and increased productivity. The reliability of equipment can also be substantially improved. - ANSWER-Preventive Maintenance _______________ pressures must be maintained to ensure adequate customer service during peak flow periods or while water is being used to fight a fire. The _______________ positive pressure must be maintained in mains to protect against back-flow or back-siphonage from cross-connections. - ANSWER-Minimum, Minimum An actual cross-connection is one for which the connection exists at all times, Examples would be solid piping to an auxiliary supply or into a boiler. An auxiliary supply could be a ________________ source used for emergencies or for reducing the costs of cooling or washing. - ANSWER-Nonpotatable Which of the following is NOT used as a water additive for corrosion control in storage tanks? - ANSWER-Aluminum Sulfate (Alum) If water distribution valves are opened rapidly, the water can cause pressure changes that travel back and forth through the pipe or system. This condition is know as? - ANSWER-Water Hammer Steel and iron pipes are sometimes galvanized. What is the galvanized coating made out of? - ANSWER-Zinc According to State Rule, "A.R.S." means? - ANSWER-Arizona Revised Statutes Construction changes made to a distribution system should be permanently recorded in which of the following? - ANSWER-Recorded on As-Built Plans Operators working with hydrochloric acid should be equipped with the following protective equipment? - ANSWER-Rubber apron, boots, face shield, rubber gloves A corporation (Corp) stop is used to? - ANSWER-Regulate service lines

Chlorine with organic material will create a carcinogenic compound known as? - ANSWER-Trihalomethanes What does the term "Back-siphonage" refer to? - ANSWER-A development of negative atmospheric pressure in the piping system The _______________ backflow assembly consists of two internally loaded independently acting check valves. During a backflow condition, both checks will shut and prevent backflow, there is not a relief valve on this device. - ANSWER-DC or Double Check Chlorine effectiveness depends upon? - ANSWER-The pH of water The most convenient way of finding or locating water lines and appurtenances is to? - ANSWER-Maintain good records A valve characterized by a movable disk rotating on a spindle would most likely be a? - ANSWER-Butterfly Valve A profile map will show the water operator? - ANSWER-A cross-sectional view of the system What type of distribution system has many dead-end lines and is not recommended for use in a highly populated area? - ANSWER-Tree System Chlorine residual should be determined by? - ANSWER-Using the DPD procedure Which of the following precautions should be taken when working with corrosive chemicals - ANSWER-PPE should be used What is the best way for drivers of Class A and B utility vehicles to routinely practice safe vehicle operation? - ANSWER-Frequently inspect the vehicles hat is the result when chlorine is added to water that is low in dissolved oxygen and has hydrogen sulfide? - ANSWER-You will create elemental sulfur Water meters can under and over register the actual water flow used by the customer. What is a major cause of inaccurate water meter readings? - ANSWER-Large amounts of water turbulence According to the Sacramento manual, all storage facilities should be regularly sampled to determine the quality of water which enters and leaves the facility. From sampling information you should clean your storage facilities if? - ANSWER-NTUs are increasing

The work order form is used by utilities to perform preventive or corrective maintenance in the system. After the work is completed, the work order form is used for? - ANSWER- Revision of existing maps and records Written records should be kept on all facilities in the distribution system. These records should describe the facility, its construction, date installed, repair and maintenance work done, manufacturer, and condition during the last inspection. In order to ensure adequate record keeping during valve and hydrant inspections, the operator should complete an inspection report for each? - ANSWER-Valve and fire hydrant When tapping a main line for a connection, the shell cutter cuts a round coupon from the existing main and retains it on the cutter. Why should the operator tag the coupon with the date and location of the tap? - ANSWER-These coupons record the condition of the water main What will cause the water quality complaint of "milky water"? - ANSWER-Entrained air The word "Stationing" on a plan drawing refers to? - ANSWER-Representation of a location from a starting point or reference How would you categorize or classify a nutating-disk water meter? - ANSWER-A displacement type meter Before excavation, determine the location of all buried water, sewer, gas, power, telephone and cable TV lines and storm drains in the work area. Many phone books list an ________________ which will assist in the location of these utilities. - ANSWER-"Underground Service Alert" or "One-Call" centers The easiest way to ensure that the locations of pipes and appurtenances will be known is to? - ANSWER-Maintain good records How or where should you record construction changes made in a distribution system? - ANSWER-Record these changes on "as built plans" Medium and large motors should not be started and stopped running more than _______________? - ANSWER-Four times a day Complete and accurate maps are important to the operator for? - ANSWER-Isolating areas due to water main breaks Under what conditions would chlorine residuals be likely to decline in water storage facilities? - ANSWER-During low use periods Clear wells are used in the distribution system. What is the main purpose of clear wells in the system? - ANSWER-Supply stored water for high demand periods

Surge tanks will operate with little difficulty provided that? - ANSWER-Adequate air space is maintained Water gradient contour maps can be used to determine? - ANSWER-Areas that have unusual pressures Which of the following reasons make galvanized pipes unsuitable for water service? - ANSWER-Galvanic Corrosion Dry tapping is a common procedure most typically found? - ANSWER-During the installation of a main and/or services What is a major cause of electrode system failure in a storage facility that measures/monitors the water depth? - ANSWER-Corrosion of electrodes What is the advantage of using a mag meter or magnetic flow meter to record flow in the distribution system? - ANSWER-No head loss through the meter The most common use of control instrumentation relays in the distribution system in to?

• ANSWER-Control and protect motors The simplest type of sensor-indicator is the Bellows type sensor. The Bellows system reacts to the change in? - ANSWER-Pressure Pipe flushing should be routine maintenance for? - ANSWER-Dead-end lines The safest means for thawing frozen water lines is? - ANSWER-Using hot water Which of the following pipes is subject to corrosion? - ANSWER-Iron/Steel Whenever excavation is necessary for repairs or new construction, shoring may be necessary. The main purpose of shoring is to? - ANSWER-Prevent the walls of a trench from collapsing Which of the following types of pumps is most frequently used as a booster pump in water distribution systems? - ANSWER-Vertical turbine pump When a pump operates under suction lift, the impeller inlet is actually operating in a vacuum. Air will enter the water stream along the shaft if the packing does not provide an effective seal. It may be impossible to tighten the packing sufficiently to prevent air from entering without causing excessive heat and wear on the shaft sleeve. Which of the following can be used to solve this problem? - ANSWER-Lantern rings What could be a result of over greasing bearings? - ANSWER-High friction in the bearing chamber

Which of the following best describes a double suction pump? - ANSWER-Water enters the impeller from two sides The purpose of the wear rings in a centrifugal double suction pump it to? - ANSWER- Prevent the wear on the bearing inside the pump