Class "C" Water Operator - Study Questions| correct answers verified A+

Class "C" Water Operator - Study Questions| correct answers verified A+Class "C" Water Operator - Study Questions| correct answers verified A+ What is an Ampere? - correct answers-a unit of measurement for current Which of the following is a type of pump that is commonly used in a water treatment plant? - correct answers-Centrifugal What is a multi-staged pump? - correct answers-has more than one impeller if the pump impeller is running backwards, what action must be taken to correct the rotation? - correct answers-switch any two electrical leads When should the packing of a pump be adjusted? - correct answers-when the pump is running when a pump fails to deliver at its rated capacity, what is most likely the cause? - correct answers-air leak what is a common cause for vibrations in a motor? - correct answers-misalignment of the couplings What is the purpose of the wear rings in a pump? - correct answers-Plug internal leakage what should the seal water pressure be for a pump? - correct answers-5 psi higher than the pumps discharge pressure what is the purpose of the seal water? - correct answers-block out air intake and lubricate the packing what is the recommended maximum suction lift? - correct answers-15 ft. In a water treatment plant, what type of pump is commonly used to deliver chemical solutions? - correct answers-Positive displacement when should you lubricate your equipment? - correct answers-follow the manufacturer's recommendations In what manner is packing installed? - correct answers-a strip at a time and staggered a positive displacement pump should never be operated________? - correct answers-against a closed discharge valve if two of more pumps of the same size and purpose are online, what method of operation is recommended for them? - correct answers-alternate to equalize wear If half of the mechanical seal fails, what corrective action should be taken? - correct answers-change both halves of the seal what is the purpose of a lantern ring? - correct answers-water seal The packing of a pump should be adjusted to _________? - correct answers-allow a slight operating leakage and allow approximately a drip per second. On a multiple drive motor, when a belt fails, what corrective action should be taken? - correct answers-Replace all the belts on the drive To keep a centrifugal pump primed, install a _______ valve at the end of the suction line. - correct answers-foot valve If a motor fails to start, what should be checked first? - correct answers-Power supply Opening or closing a valve rapidly will cause? - correct answers-water hammer The formation and collapse of a gas pocket or bubble on the blade of an impeller is called? - correct answers-cavitaion Changing the packing on a pump is called ________ maintenance - correct answers-corrective what is an example of a daily maintenance task for a compressor? - correct answers-drain the air receiver what type of valve is usually used to control the rate of flow? - correct answers-globe valve what type of valve is buried? - correct answers-non-rising stem what is the most common valve type used in a water treatment plant? - correct answers-gate valve what will happen if the gate valve is left half open to control flow? - correct answers-Undue seat wear In what manner should carbon be stored? - correct answers-on concrete floor in single rows what is brinelling? - correct answers-a type of bearing wear what is the recommended manner for storing potassium permanganate? - correct answers-on a concrete floor away from heat or heated pipes what causes more damage to a pump's impeller? - correct answers-Air What is the unit of electrical resistance? - correct answers-Ohm What is an ammeter - correct answers-measures amps and current what type of electrical service is usually found in water plants? - correct answers-three phase Generally, all motors over over two HP require what type of electrical service? - correct answers-3 phase Before starting work on any electrical equipment, you must first ____? - correct answers-Lock out tag out What unit is used to measure the rate of power Consumption? - correct answers-Kilowatts What is the function of a shear pin? - correct answers-to prevent damage to equipment when there is an overload The measurement of how close an instrument determines the true of actual reading of an instrument is called? - correct answers-Accuracy The readout of an instrument by the use of a pointer against a scale is an _____ reading? - correct answers-analog The device that controls the operation of equipment is called? - correct answers-controller The readout of an instrument by a direct numerical reading of the measured value id called a ________ reading? - correct answers-digital what is an instrument's ability to measure a process value and repeatedly obtain the result called? - correct answers-precision what is the difference between the actual value and desired value? - correct answers-drift what is software? - correct answers-computer programs A device that measures the accumulative amount of a process over a 24 hour period is called? - correct answers-Totalizer What is the Williams-Steiger Federal law known as today? - correct answers-OSHA Who is responsible for your safety in the workplace? - correct answers-yourself your should never add _____ to acid because it will cause a violent reaction. - correct answers-water what two chemicals widely used in water treatment will cause an explosion when mixed? - correct answers-lime and alum (base and acid) what is usually the first indication of a carbon fire? - correct answers-heat what type of fire extinguisher is used for a carbon fire - correct answers-carbon dioxide what percentage of oxygen is there in air? - correct answers-20.9% Broken laboratory glassware should be ____ to avoid injuries. - correct answers-flame polished recommended fluoride control limits are based on which of the following? - correct answers-annual average maximum daily temperatures how many pounds of CL2 can you withdraw from a 150 lb cylinder in a day? - correct answers-40 how many pounds of CL2 can you withdraw from a one ton cylinder in a day? - correct answers-400 chlorine is ____ times heavier than air? - correct answers-2.5 One liter of liquid chlorine will expand to ______ liters of chlorine gas. - correct answers-450 The chlorine dosage minus the chlorine residual id the formula for the _____. - correct answers-Demand NaOC1 is the chemical formula for ______? - correct answers-Sodium Hypochlorite HOC1 is the chemical formula for _____? - correct answers-Hypochlorous Acid OC1 is the chemical formula for ______? - correct answers-Hypochlorite H2S is the chemical formula for_____? - correct answers-Hydrogen sulfide How many parts per million of chlorine will it take to oxidize 1 ppm hydrogen sulfide to elemental sulfer? - correct answers-2.08 how many parts of chlorine will it take to oxidize 1 ppm of H2S to sulfate? - correct answers-8.32 (CA(OH)2) id the chemical formula for ? - correct answers-calcium hydroxide the by-product of slaked lime is? - correct answers-heat preventative maintenance for a gate valve includes? - correct answers-opening and closing corrective maintenance for a gate valve includes? - correct answers-packing replacement and handle replacement Lauryl Triptose is used in to ____ stage of the MPN test. - correct answers-presumptive Brilliant green bile broth is used in the ___ stage of the MPN test. - correct answers-Colilert what does it mean if every tube in the MPN test confirmed state has gas? - correct answers-the test is invalid what test can measure total and fecal coliform at the same time? - correct answers-Colilert an organism found in the intestines of human beings and animals, and in plants, land, and air is called? - correct answers-Coliform An organism found only in the intestines of warm blooded animals is called? - correct answers-fecal coliform the best test to measure the effectiveness of a WTP's process is? - correct answers-turbidity the number of monthly samples for coliform analysis is based on? - correct answers-population served when 40 or more coliform samples are taken, you can have_____ positive - correct answers-2, or 5% at the extremes of the distribution system you must have at least a ____ free CL2 residual. - correct answers-0.2 E-coli broth is used when testing for____. - correct answers-fecal coliform chlorine should never be fed ahead of ___? - correct answers-polyphosphates the distribution system has complaints of pink water. The WTP has a greensand filter. What is most likely the cause? - correct answers-overdose of potassium permanganate the addition of chlorine to water until the demand is satisfied and every drop of water after that is free residual is called? - correct answers-break point chlorination adding alum to water _____ the PH level. - correct answers-lowers a common membrane used in reverse osmosis water treatment is____. - correct answers-cellulose acetate all surface water and ground water under the influence of surface water must be _______. - correct answers-disinfected and filtered. to obtain a "C" water license, an operator must have ________ hours of on the job training. - correct answers-2,080 what is the action level for lead? - correct answers-0.015 mg/l what is the maximum chlorine residual level allowed in the distribution system? - correct answers-4.0 mg/l for water systems using chlorine dioxide, what is the MCL for chlorite? - correct answers-1.0 mg/l what is the MCL for color? - correct answers-15 the MCL for turbidity is not more than ____ NTU as a monthly average - correct answers-0.5 the WTP uses 360 gallons of 10% NaOCl a day. how many pounds of CL2 do they use? - correct answers-300 are you going to pass this test? - correct answers-Yes you are! the WTP totalizer read 0129 at the beginning of the first shift for the month and 0000 at the end of the last shift for the month. How many gallons of water were treated daily? - correct answers-0.329 MGD what is the marble test used for? - correct answers-determine if water is scale forming or corrosive using the membrane filtration method, what is the incubation temperature for the total coliform test? - correct answers-35.0 degrees C. plus or minus 0.5 degrees C for the membrane filtration method, what is the incubation period for total coliform? - correct answers-24 hrs + or - 2 hrs with the membrane filtration method, what is the incubation time for the fecal coliform test? - correct answers-24 hrs + or - 2 hrs what is the molecular weight of Na2CO3? (N=23, C=12, O=16) - correct answers-106 who had a better career? Kobe or Tim Duncan - correct answers-Tim Duncan What is Texas Independence Day? - correct answers-March 2nd, 1836 what are the criteria used to classify water treatment plants? - correct answers-size and process used when NaOCl is added to water, what reaction takes place? - correct answers-PH increases what happens when HOCL is added to water? - correct answers-PH decreases what is a common level control device used in water treatment plants? - correct answers-ball floats a water system that has at least 15 service connections used by all year residents or regularly serves at least 25 year round residents is called? - correct answers-community system a system that has at least 15 service connections, or regularly serves an average of at least 25 individuals daily at least 06 days out of the year is a ______ system? - correct answers-public the chief operator for a class "B" WTP needs what level of license? - correct answers-B a "B" class WTP must have a "C" operator or higher on duty for ______. - correct answers-16 hrs a day / 7 days a week what is the most effective PH range for iron removal? - correct answers-8 to 9 a successful method for removing H2S from water with a Ph of 9.4 is to ? - correct answers-increase aeration adding sodium aluminate to water will? - correct answers-increase PH what is the lowest hardness achievable by the lime or lime-soda ash process? - correct answers-30-40 when you are gathering the monthly coliform samples, what other test/sample must be taken? - correct answers-chlorine residual a natural underground layer of porous, water-bearing materials usually capable of yielding a large supply of water is called? - correct answers-an aquifer what is the most likely cause of black water in the distribution system? - correct answers-manganese and H2S specific conductance is an indirect measurement of ________? - correct answers-TDS what is the purpose of installing tube settlers? - correct answers-aid sedimentation how long does the coagulation process take? - correct answers-a few seconds during an inspection of the plant, you discover that a filter is air-bound. what action should you take? - correct answers-backwash the filter immediately. what will affect the efficiency of tube settlers? - correct answers-high wind how many zones are the in a sedimentation basin? - correct answers-4 Aluminum sulfate is used as a coagulant because it has? - correct answers-trivalent ions the zeta potential and size of particles in water affect the? - correct answers-settling in the coagulation and flocculation process, the difference in the electrical charge between the dense layer of ions surrounding the particle and the charge of the bulk of the suspended fluid surrounding the particle is called? - correct answers-zeta potential the particles in water generally have a _____ charge. - correct answers-negative when water passes through an ion exchange resin bed, what is usually unaffected by the process? - correct answers-PH when water is softened using the ion exchange process, what substance will appear in the finished water? - correct answers-sodium in the split treatment process, what portion of the flow bypasses the treatment unit? - correct answers-20% which of the following is a requirement for obtaining the "C" water license? - correct answers-high school deploma water pressure in the distribution system must never go below ____ PSI - correct answers-20 you should avoid using polyphosphate that is over ______ hours old. - correct answers-48 what is the third stage in the ion exchange process? - correct answers-brine a greensand filter is commonly used to remove? - correct answers-iron what chemical is used to regenerate greensand? - correct answers-potassium permanganate what is the largest cause of water borne illness in the united states? - correct answers-cross contamination water rights to a water supply, which are acquired for the beneficial use of water by following a specific legal procedure, are called? - correct answers-appropriative a connection between potable water and an unapproved connection is called? - correct answers-cross contamintaion the theoretical time it takes for a small amount of water to pass through a tank at a given flow rate is called? - correct answers-detention time water rights, which are acquired by diverting water an putting it to use in accordance with specified procedures, are called? - correct answers-prescriptive the drop in the water table or groundwater level when the water is being pumped from a well is called? - correct answers-drawdown