TCEQ Class D Water Operator License Exam Questions With All Correct Answers, Exams of Water and Wastewater Engineering

Download TCEQ Class D Water Operator License Exam Questions With All Correct Answers and more Exams Water and Wastewater Engineering in PDF only on Docsity! TCEQ Class D Water Operator License Exam Questions With All Correct Answers T/F: In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. - True Water covers approximately ________ of Earth's surface. - 71% Drought is an extended period when a region receives a deficiency in its ________ water supply. - atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking - True Excluding outside water use, the average household uses about _______ gallons of water per month for inside use - 2,000 T/F: Only 3% of all the fresh water on earth can be easily accessed for use. - False (only 1%) T/F: In 1978, the Texas Department of Health (TDH) assumed primacy over the Safe Drinking Water Act from the EPA. - True T/F: PWS officials should be pro-active in their approach to terrorism. - 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. - Rule of Capture In Texas, agricultural water demand accounts for about ___% of the total water used. - 57% T/F: An example of a non-transient non-community PWS is a rural school. - True Monitoring average and maximum daily water ______ enables us to plan ahead for growth. - Demand T/F: The Safe Drinking Water Act sets standards for drinking water including physical, chemical, bacteriological, and radiological characteristics. - True "Potable" means water is safe to drink and has a measurable chlorine ________. - Residual The plant operator is responsible for a sufficient supply of safe and ________ drinking water. - Palatable T/F: The Texas State Board of Fire Insurance requires utilities that provide fire protection to have a minimum amount of water available based on 30 gals per person per day. - False (130 gals per person per day) T/F: The primary state regulator of water utilities is the TCEQ. - True T/F: All community and non-transient non-community PWS, regardless of source of water, must be under the supervision of a licensed water works operator. - True Meter readers bring in operating revenue and profoundly impact _____ relations. - Public The federal regulator of drinking water is the _____. - EPA T/F: Duties of distribution operator include repairing leaks, making taps, flushing mains, and taking radiological samples. - False (Repair leaks, Make taps, Flush mains, Operate pumps, Take *bacteriological* samples) A service area has 1000 service connections. What can we estimate the population of this service area to be? - 3,000 (multiply connections x 3) T/F: The State must be notified after an existing facility is changed or after construction of a new facility. - False (must notify *before*) T/F: A Class "D" license is valid for 2 years at ground and purchase water systems with 250 connections or less. - False (3 years) T/F: The physical characteristics of water are color, taste, odor, temperature, and turbidity. - True An alkaline or basic solution has a pH greater than ____. - 7 T/F: The terms mg/L and ppm are not interchangeable. - False (they are interchangeable) Suspended solids in water cannot be filtered out. - False (they can) Solids, water hardness, pH and gases are ____ characteristics. - Chemical T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. - True T/F: The State recommends a water pH of less than 7 to be maintained at all time. - False (The state recommends a pH slightly greater than 7 and for the water to be non-corrosive.) T/F: Low doses of heavy metals such as lead and copper can cause damage to the central nervous system over time. - True A certain group of bacteria is used to indicate the possible presence of a pathogen--- the ________ group. - Coliform Disinfection is the destruction of disease-causing microorganisms called ______. - Pathogens At room temperature chlorine is a greenish-yellow gas that is ___ times heavier than air. - 2.5 The State requires ________ to be kept in stock for disinfecting new water lines. - Calcium hypochlorite T/F: Hypochlorinators consist of a mixing tank and chemical solution feed pump. - 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. - 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. - True If chlorine enters the eyes, flush with running cool water for at least ___ minutes and seek medical attention. - 15 minutes Liquid bleach used in PWS must be ______ approved. - NSF T/F: Primary components of a gas feed chlorinator include an injector, flowrate controller, rotameter, and mixing tank. - 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 - 40 T/F: Utility operators use chlorine in three commercial forms: 1) pure chlorine in the liquid or gas state 2) bleach solutions 3) granular/tablet compounds - True T/F: If chlorine contacts the skin, flush with an emergency shower or garden hose for at least an hour. - False (15 minutes) Hypochlorous acid is the disinfectant and the _____ residual. - Free If a major chlorine leak occurs, call the supplier and ______. - TCEQ The rotameter indicates the feed rate in _____ per day - pounds T/F: Chlorine reacts with hydrocarbons producing heat or fire - True Chlorinator rooms must be provided with facilities from determining the amount of disinfectant used _______ - daily T/F: Dosage is the amount of chlorine applied in milligrams per liter or parts per billion. - False (parts per million) DPD reacts with chlorine producing a pink to ____ color. - red T/F: Residual is the amount of chlorine left after the demand is met. - 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) T/F: TCEQ requires a faucet for raw water sampling on the discharge pipe of each PWS well. - True Permeability is the ability to _____ water through the aquifer. - transmit T/F: The difference between the static level and pumping level is call the drawdown. - True Wells dug into artesian aquifers are considered _____ wells. - deep The well screen prevents _____ from entering the well. - sand T/F: Treatment of corrosive groundwater can be accomplished by adding alkalinity as lime or soda ash to adjust the pH. - True T/F: The line shaft turbine is driven by a motor located above the pump at ground level. - True T/F: Well casing supports the bore hole and helps protect the aquifer from contamination. - True T/F: The State requires a physical and chemical analysis of the water after 24 hours of pumping. - False (36 hours) T/F: Some artesian aquifer recharge areas (outcrop) are located many miles away from the well development site. - True (Artesian Wells can be recharged from many miles away) A BacT sample, taken from a newly constructed well, on ____ consecutive days, must show negative results. - 3 Water in an aquifer is called _____ water. - ground T/F: A sanitary control easement covering land within 1500 feet of a public well must be recorded in county courthouse records. - False (150 feet) The casing must extend at least ____ inches above the floor of the pump room or ground surface. - 18 T/F: Aquifers sandwiched between impermeable layers of rock or clay are called confined aquifers or artesian aquifers. - True Three ways to measure water levels is the wetted tape, electric sounder, and the ______. - airline (most often used) A well drilled into a water table aquifer is usually a ______ well. - Shallow Abandoned wells, not plugged, within ___ mile of a proposed well site must be reported to TCEQ. - 1/4 The State requires wells be protected by ______-______ fences or locked well houses. - Intruder-resistant Groundwater is usually clear and void of __________. - bacteria TCEQ defines "complete treatment" as the following sequence of processes: pretreatment disinfection, taste and odor control, continuous coagulation, filtration, sedimentation, terminal disinfection, and covered storage. - False (1. Pretreatment disinfection 2. Taste and odor control 3. Continuous coagulation *4. Sedimentation* *5. Filtration* 6. Terminal disinfection 7. Covered storage) T/F: Most solids should be removed in the filtration step. - False (Sedimentation) T/F: TCEQ requires filtered water to be 0.3 NTUs or less in at least 95% of measurements each month. - True Stored water can meet sudden demands such as fire, absorb pressure surges, provide detention/contact time for ________, and allow for expansion of the distribution system. - chlorination T/F: Methods of fighting corrosion include coatings, temperature adjustment, and cathodic protection. - False (pH adjustment, Orthophosphates, Poly-pigs) T/F: The most common design for residential service is the positive replacement meter. - False T/F: The curb stop connects the main service line and the corporation stop isolates the meter for repair or replacement - False (The *corporation stop* connects to the city main and the *curb stop* is used to isolate the meter for repair) T/F: Close a fire hydrant slowly or a water log could occur. - False To help safeguard against electrocution or machine injury, a safety program should have a ___________ policy. - lockout / tagout Install all _______ from the top down and remove from the bottom up. - shoring T/F: Before digging, notify underground utilities. - True The Texas Hazard Communication Act requires employers to provide Safety Data Sheets (SDS) for hazardous ______ used in the workplace. - chemicals T/F: Barricade stripes must slope downward at 30 degrees in the direction the traffic is to pass. - False (45 degrees) T/F: Training in the hazardous chemicals must be taken only once a year. - False The STOP/SLOW paddle should be the ______ traffic control device. - primary T/F: Flashing lights must be yellow and are excellent for attracting a driver's attention toward a potential hazard. - 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. - True The State allows utility works to use _______ control devices at work sites provided the devices conform to current manual criteria. - traffic Generally, signs should be located on the right-hand side of the road and mounted on supports, posts, or __________ - barricades The least stable soil type is _________ - Type C A good safety program should have management leadership, employee participation, hazard identification, training, and ____________. - equipment T/F: A competent person should inspect the cave-in protection at least daily. - True T/F: The Texas Hazard Communication Act is known as the "Right to Risk Law" - False ("Right to Know") A confined space entry team consists of a supervisor, an attendant, and an authorized _________. - entrant Oxygen deficiency is considered to be less than ____% oxygen. - 19.5 T/F: Limit flag use to emergency situations and at locations controlled by a single flagger. - True The spoil should be placed no closer than ___ft from the edge of the excavation. - 2 ft For day or night work, a flagger's clothing can be blue or brown. - False 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 - 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 - 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 - b) 0 - 14 Before a new main is placed into service, it must be properly disinfected with a minimum chlorine dosage of: a) 50 mg/L b) 30 mg/L c) 40 mg/L d) 75 mg/L e) 25 mg/L - a) 50 mg/L A common chemical used for disinfecting a small public water supply is: a) soda ash b) copper sulfate c) sodium hypochlorite d) fluoride e) sodium chloride - c) sodium hypochlorite Gravity filters will remove which of the following from surface water supplies: a) turbidity b) taste and odors c) nitrates d) hardness e) chlorides - a) turbidity If you added 3.5 mg/L of chlorine to your storage tank and 30 minutes later measured the residual at 1.2 mg/L, what was the chlorine demand in the tank? a) 4.2 b) 2.9 c) 0.3 d) 2.3 e) 4.7 - d) 2.3 Your ground storage tank is 15 feet high and 30 feet in diameter. About how much water can it hold? a) 31,700 gallons b) 79,270 gallons c) 50, 490 gallons d) 25,150 gallons e) 10,600 gallons - ... When fecal coliform organisms are found in a water supply, it is an indication that: a) the water supply is contaminated b) pathogenic organisms might be present c) the water may be unsuitable for drinking d) follow-up sampling must take place e) all of the above - e) all of the above