Texas Class D Water Operator License Exam TCEQ, Exams of Water and Wastewater Engineering

Download Texas Class D Water Operator License Exam TCEQ and more Exams Water and Wastewater Engineering in PDF only on Docsity! Class D Water Operator License Exam TCEQ Texas Class D Water Operator License Exam TCEQ Containing 180 Questions with Certified Solutions 2024-2025. (Dark Back Ground for better Visibility and eye Care) T/F: In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. - Answer: True Water covers approximately ________ of Earth's surface. - Answer: 71% 1 Class D Water Operator License Exam TCEQ Drought is an extended period when a region receives a deficiency in its ________ water supply. - Answer: atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking - Answer: True Excluding outside water use, the average household uses about _______ gallons of water per month for inside use - Answer: 2,000 T/F: Only 3% of all the fresh water on earth can be easily accessed for use. - Answer: False (only 1%) T/F: In 1978, the Texas Department of Health (TDH) assumed primacy over the Safe Drinking Water Act from the EPA. - Answer: True T/F: PWS officials should be pro-active in their approach to terrorism. - Answer: True _________ permits the owner of a well to pump as much water as desired, even if the water is drained from beneath the land of others. - Answer: Rule of Capture In Texas, agricultural water demand accounts for about ___% of the total water used. - Answer: 57% 2 Class D Water Operator License Exam TCEQ Suspended solids in water cannot be filtered out. - Answer: False (they can) Solids, water hardness, pH and gases are ____ characteristics. - Answer: Chemical T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. - Answer: True T/F: The State recommends a water pH of less than 7 to be maintained at all time. - Answer: False (The state recommends a pH slightly greater than 7 and for the water to be non-corrosive.) T/F: Taste and odor can come from organisms such as vegetation, bacteria, and algae, and from certain chemicals and metals. - Answer: True T/F: The deeper the well, the warmer the water. - Answer: True T/F: The threshold odor number (TON) relates to the number of dilutions needed for the water to be tasteless. - Answer: False (It reflects the number of dilutions needed for water sample to be *odorless*) One part per million or 1 mg/L means that for every ____ pounds of water there is one pound of material in it. - Answer: 1 million 5 Class D Water Operator License Exam TCEQ The State requires filtered water to be equal to or less than ____ turbidity units in at least 95% of the monthly samples. - Answer: 0.3 The State recommends a TON of ___ or less. - Answer: 3 T/F: The State recommends 20 color units or less for a quality water. - Answer: False (The state recommends 15 units of color or less for drinking water.) T/F: Examples of inorganic matter found in water include rock, sand, metals, and minerals. - Answer: True T/F: The red color caused by iron is an example of suspended or apparent color and it can be removed by filtration. - Answer: True Excessive calcium and _____ are the primary cause of hardness in water. - Answer: Magnesium T/F: The State recommends a maximum total dissolved solids content of 500 mg/L - Answer: False (The state recommends that TDS not exceed 1000 mg/L) There are 3 common gases found in water: methane, carbon dioxide, and __________ ___________. - Answer: hydrogen sulfide T/F: Turbidity must be limited because it shelters and nourishes bacteria and interferes with disinfection. - Answer: True 6 Class D Water Operator License Exam TCEQ T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. - Answer: False (flaming requires less contact time) T/F: The "primary limits" refer to chemicals with maximum contaminant levels that can be exceeded. - Answer: False (refers to chemicals with maximum contaminant levels (MCLs) that *CANNOT* be exceeded.) T/F: The term "total coliform" means fecal and non-fecal coliform. - Answer: True T/F: Pathogens are disease-causing microorganisms. - Answer: True If a routine sample is positive, flush the positive sample point, check the chlorine residual, then resample within 24 days of notification. - Answer: False (If a routine sample is total coliform-positive, the PWS should flush the positive sample point, check the chlorine residual, then resample within *24 hrs* of notification) To prevent the formation of THMS in surface water, chlorine is combined with _____ forming chloramine, combined chlorine residual. - Answer: Ammonia If there is no chlorine ______ at a faucet, do not sample, flush longer. - Answer: residual T/F: All repeat samples must be collected on successive days. - Answer: False (Collect all repeat sample on the same day) 7 Class D Water Operator License Exam TCEQ T/F: Hypochlorinators consist of a mixing tank and chemical solution feed pump. - Answer: True A full-face self-contained breathing apparatus or supplied air respirator must be readily accessible outside the fire station when chlorine gas is used. - Answer: False (A full-face self-contained breathing apparatus (SCBA) or supplied air respirator that meets OSHA standards shall be readily accessible outside the *chlorinator room* when chlorine gas is used.) T/F: All public water systems must have chlorination facilities. - Answer: True If chlorine enters the eyes, flush with running cool water for at least ___ minutes and seek medical attention. - Answer: 15 minutes Liquid bleach used in PWS must be ______ approved. - Answer: NSF T/F: Primary components of a gas feed chlorinator include an injector, flowrate controller, rotameter, and mixing tank. - Answer: False (injector, vacuum regulator, flowrate controller, rotameter- *not a mixing tank*) The maximum sustained gas withdrawal rate for pressure transmission 150 lb cylinders is ____ lbs/day - Answer: 40 T/F: Utility operators use chlorine in three commercial forms: 1) pure chlorine in the liquid or gas state 10 Class D Water Operator License Exam TCEQ 2) bleach solutions 3) granular/tablet compounds - Answer: True T/F: If chlorine contacts the skin, flush with an emergency shower or garden hose for at least an hour. - Answer: False (15 minutes) Hypochlorous acid is the disinfectant and the _____ residual. - Answer: Free If a major chlorine leak occurs, call the supplier and ______. - Answer: TCEQ The rotameter indicates the feed rate in _____ per day - Answer: pounds T/F: Chlorine reacts with hydrocarbons producing heat or fire - Answer: True Chlorinator rooms must be provided with facilities from determining the amount of disinfectant used _______ - Answer: daily T/F: Dosage is the amount of chlorine applied in milligrams per liter or parts per billion. - Answer: False (parts per million) DPD reacts with chlorine producing a pink to ____ color. - Answer: red T/F: Residual is the amount of chlorine left after the demand is met. - Answer: True (Dosage: How much Cl you put in the system, Demand: How much Cl is used by the system, Residual: How much Cl is left over) 11 Class D Water Operator License Exam TCEQ T/F: TCEQ requires a faucet for raw water sampling on the discharge pipe of each PWS well. - Answer: True Permeability is the ability to _____ water through the aquifer. - Answer: transmit T/F: The difference between the static level and pumping level is call the drawdown. - Answer: True Wells dug into artesian aquifers are considered _____ wells. - Answer: deep The well screen prevents _____ from entering the well. - Answer: sand T/F: Treatment of corrosive groundwater can be accomplished by adding alkalinity as lime or soda ash to adjust the pH. - Answer: True T/F: The line shaft turbine is driven by a motor located above the pump at ground level. - Answer: True T/F: Well casing supports the bore hole and helps protect the aquifer from contamination. - Answer: True T/F: The State requires a physical and chemical analysis of the water after 24 hours of pumping. - Answer: False (36 hours) 12 Class D Water Operator License Exam TCEQ Destratification is the mixing of lake water by compressed air to prevent layers of different __________ from developing. - Answer: temperature All PWS in Texas are required to use ________ as the final disinfectant. - Answer: chlorine T/F: Powdered activated carbon (PAC) is commonly used to treat iron and manganese. - Answer: False (removes the tastes and odors usually caused by dead and decaying *algae* and vegetation) A restricted zone of ______ ft radius from the raw water intake must be established and recreational activities and trespassing shall be prohibited. - Answer: 200 T/F: The Rio Grande River is the longest river in Texas, stretching 250 miles along the Mexico border. - Answer: False (1250 miles) T/F: Filtration is the first step in the removal of suspended solids. - Answer: False (Sedimentation) Surface water is usually low in ________ and ________. - Answer: minerals / gases Chemical dosage, water temperature, pH, _______, and the characteristics of the raw water all have an effect on the coagulation process. - Answer: mixing 15 Class D Water Operator License Exam TCEQ The two pathogenic protozoans resistant to chlorination are: ________ and _________ - Answer: giardia / cryptosporidium T/F: Bacteria, algae, and turbidity can be a problem in surface water as can be municipal, industrial and agricultural pollution. - Answer: True T/F: Coagulation works by the bonding of negatively charged turbidity to positively charged chemical coagulants. - Answer: True T/F: Turbidity can shelter bacteria from the disinfection process. - Answer: True _______ is the last treatment step before storage. - Answer: Disinfection T/F: Treated water is stored at the plant in a tank called a clear well. - Answer: True The process of separating floc from water by gravity is called: __________ - Answer: sedimentation Filtration is the last barrier between the public and _______ or ________. - Answer: giardia / cryptosporidium T/F: If the media collects in the wash water troughs, the wash rate is too high. - Answer: True 16 Class D Water Operator License Exam TCEQ T/F: A check valve located on the discharge side of a pump is an isolating valve that allows water to flow one direction only. - Answer: False (it is a *controlling valve*) T/F: The total dynamic head a pump must overcome is the distance from the water level on the suction side of the pump to the top of the water level on the discharge side of the pump and includes any friction and head loss encountered. - Answer: True Dead-end mains must be provided with ________ - Answer: Flush valves T/F: Common cross connections include a garden hose connected to a potable water source and submerged in a stock tank, a home served by a city water supply and private well, and a chemical container connected to a potable water supply. - Answer: True T/F: If a repaired main must be returned to service quickly, does with 50 mg/L for 30 minutes. - Answer: False (*500 mg/L*) T/F: TCEQ requires at least 1 BacT sample for each 1000 ft of new main. - Answer: True Pipe and fittings must not contain more than ____% lead or solder/flux containing more than ___% lead. - Answer: 0.25% 17 Class D Water Operator License Exam TCEQ The Texas Hazard Communication Act requires employers to provide Safety Data Sheets (SDS) for hazardous ______ used in the workplace. - Answer: chemicals T/F: Barricade stripes must slope downward at 30 degrees in the direction the traffic is to pass. - Answer: False (45 degrees) T/F: Training in the hazardous chemicals must be taken only once a year. - Answer: False The STOP/SLOW paddle should be the ______ traffic control device. - Answer: primary T/F: Flashing lights must be yellow and are excellent for attracting a driver's attention toward a potential hazard. - Answer: True T/F: A confined space entry program should identify confined spaces, establish a permit system, train personnel, provide safety equipment and develop rescue procedures. - Answer: True The State allows utility works to use _______ control devices at work sites provided the devices conform to current manual criteria. - Answer: traffic Generally, signs should be located on the right-hand side of the road and mounted on supports, posts, or __________ - Answer: barricades 20 Class D Water Operator License Exam TCEQ The least stable soil type is _________ - Answer: Type C A good safety program should have management leadership, employee participation, hazard identification, training, and ____________. - Answer: equipment T/F: A competent person should inspect the cave-in protection at least daily. - Answer: True T/F: The Texas Hazard Communication Act is known as the "Right to Risk Law" - Answer: False ("Right to Know") A confined space entry team consists of a supervisor, an attendant, and an authorized _________. - Answer: entrant Oxygen deficiency is considered to be less than ____% oxygen. - Answer: 19.5 T/F: Limit flag use to emergency situations and at locations controlled by a single flagger. - Answer: True The spoil should be placed no closer than ___ft from the edge of the excavation. - Answer: 2 ft For day or night work, a flagger's clothing can be blue or brown. - Answer: False 21 Class D Water Operator License Exam TCEQ Which of the following is part of a hypochlorination system? a) solution feed pump b) gas cylinder c) rotameter d) injector/ejector e) all of the above - Answer: a) solution feed pump An elevated storage tank should be protected against corrosion by: a) painting b) cathodic protection c) water stabilization d) all of the above e) galvanizing - Answer: d) all of the above (painting, cathodic protection, and water stabilization) The pH of water indicates whether it is acidic or basic and is expressed by a scale of numbers ranging from: a) 0 - 7 b) 0 - 14 c) 1 - 7 d) 1 - 14 e) none of the above - Answer: b) 0 - 14 Before a new main is placed into service, it must be properly disinfected with a minimum chlorine dosage of: 22 Class D Water Operator License Exam TCEQ The purpose of an air line on a well is to: a) aerate the well b) determine the depth of the aquifer c) inject chlorine into the well d) allow the well to breathe e) determine the water level - Answer: e) determine the water level The drawdown of a well is determined by: a) a properly installed air line b) the difference between the static and pumping level c) a psi gage calibrated in feet of water d) a tape measure e) an electronic sounder - Answer: b) the difference between the static and pumping level A common type of oxidant that is used at most SW treatment plants to kill bacteria and to prevent trihalomethane formation is: a) total chlorine b) combined chlorine c) chlorine dioxide d) free chlorine e) ozonation - Answer: b) combined chlorine A PWS is responsible for providing: 25 Class D Water Operator License Exam TCEQ a) potable water b) adequate water pressure c) an adequate quantity of water d) all of the above e) soft water - Answer: d) all of the above The amount of chlorine in mg/L that is used up by reactions with organics and inorganics is called: a) dosage b) demand c) total chlorine d) residual e) free chlorine - Answer: b) demand A potable water supply: a) is free of pathogenic organisms b) has an adequate chlorine residual c) contains a safe level of chemicals d) all of the above e) is found only in community type water systems - Answer: d) all of the above According to state rules, all PWS wells must be provided with concrete sealing slabs, screened casing vents, raw water sampling taps and: a) liquid level indicators b) surge suppressors 26 Class D Water Operator License Exam TCEQ c) flow measuring devices d) fluoridation injection equipment e) pressure gauges - Answer: c) flow measuring devices 27