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CLASS C WATER LICENSE EXAM |
QUESTIONS & ANSWERS (VERIFIED) |
LATEST UPDATE | GRADED A+
a disease that cannot be contracted by drinking contaminated water is Correct Answer: malaria a non-permit confined space by OSHA standards means a confined space that Correct Answer: does not contain or have the potential to contain any hazard capable of causing death when used in connection with the safe drinking water act, the term mcl means Correct Answer: maximum containment level examples of non-community water systems include Correct Answer: highway rest areas the TCEQ requires that results be recorded submitted daily for surface water supplies for Correct Answer: disinfectant residuals,turbidity, total solids, ph, alkalinity
tracking and maintaining an operator's training records is ultimately the responsibility of the Correct Answer: operator an employee withought a breathing apparatus is in a room where chlorine gas suddenly begins leaking. What should the employee do first Correct Answer: keep mouth closed, keep head as high as possible, and quickly walk out the room, holding his breath if possible before charging a gas chlorine cylinder in a room, the first step should be Correct Answer: start exhaust vent fan waterworks operator's holding grade c certificates are required to renew their certificates every three years and to Correct Answer: inform the TCEQ of any address changes in order to insure that the water produced meets TCEQ standards, each surface water treatment plant must have a surface water operator on duty at all times when the plant is in operation or the plant must be provided with Correct Answer: continuous turbidity and disinfectant residual monitors, automatic alarms systems, and an automatic shutdown system
Correct Answer: pH adjustments which pH measurement would indicate that water is basic (6.0;6.9;7.0;8.3) Correct Answer: 8. the safe water drinking act has set water quality standards for which category Correct Answer: physical and chemical, radiological, and bacteriological when a coagulant reacts with finely divided and suspended material in raw water, a Correct Answer: floc is formed the rules and regulations for public water systems require straight flow rectangular sedimentation basins to be designed to provide detention time of at least Correct Answer: 6 hours which of the following statements regarding the sedimentation process is true Correct Answer: the 4 traditional zones of a rectangular sedimentation basin are the inlet zone, settling zone, and the sludge zone tastes and odors caused by decaying vegetation can often be removed in the treatment process by the use of Correct Answer: activated carbon
What chemical is used for softening water Correct Answer: lime (soda ash) the process of coagulation includes Correct Answer: A chemical reaction, a physical reaction, an agglomeration reaction, and neutralization of charged particles If sludge is allowed to remain too long on the bottom of a sedimentation basin, a problem could develop with Correct Answer: taste and odor problems,reduction of detention time in basin, resuspension of solids, and creation of septic conditions coagulation is affected by Correct Answer: turbidity, pH, and temperature in raw water reservoirs, the most common effect of aeration is Correct Answer: removal of taste and odors sedimentation is improved by Correct Answer: uniform, horizontal, low velocity flow across the basin the most important water quality change in filter effluent is Correct Answer: turbidity
filter underdrains or bottom serve several important purposes including Correct Answer: deliver the back wash water uniformly underneath the filter media jar tests are used to determine the correct chemical dosage Correct Answer: the rules and regulations for public water systems states the minimum pressures in all water distribution systems must not be less than 20 psi and that normal operating pressure must not be less than Correct Answer: 35psi the state board of insurance recommended capacity for ground storage includes Correct Answer: 4 - 6 hour supply, 130 gallons per capita, 200 gallons per connection an altitude valve is used to Correct Answer: control the water elevation in an elevated storage tank two pressure gauges at the foot of two storage tanks are at the same elevation. the water levels in the two tanks are the same, but tank x holds 1,000,000 gallons of water and tank y holds 500,000 gallons. the gauge on tank x will have the reading of Correct Answer: the same as tank y the capacity of a centrifugal pump will be decreased by
Correct Answer: insufficient suction head a standpipe Correct Answer: has a diameter less than it's height the most effective method of cross connection control is Correct Answer: a physical air gap If using the combined available chlorine residual (CACR) method of disinfection Correct Answer: when water temperature decreses, the CACR must be increased in order to maintain proper chlorine residuals after installation or repair of a water line, it should be treated with Correct Answer: 50mg/l of chlorine for 24 hours calcium hypochlorite Correct Answer: is 60-70% chlorine chlorine gas Correct Answer: is highly toxic and can be fatal; is corrosive in damp surroundings the rules and regulations for public water systems states that distribution systems must maintain a chlorine residual of
A new section of water main has just been laid before it is completely back filled and put into service several things must be done what is the correct order for doing them Correct Answer: Pressure test,flush,disinfect,flush collect bacti sample Check valve on a discharge side of a pump are used to Correct Answer: Prevent water fro, flowing back through the pump when it is shut off The maximum allowable time for samples to be submitted to the laboratory is Correct Answer: 30hrs An electrochemical means of preventing corrosion on tank surfaces below the water line Correct Answer: Cathodic protection Underground pipe failures relates to Correct Answer: Improper backfill and lack of proper bedding Type "c" soil Correct Answer: Always use shoring (1 1/2 to 1-) An on-site inspection of the water source, facility equipment, operation and maintenance of a public water system Correct Answer: Sanitary survey
Community Water System Correct Answer: Rv parks The lead ban prohibits the use of Correct Answer: Pipes or fittings containing more that 8% lead solders of flux containing more than 0.2% lead On soft mains use Correct Answer: Tap-saddle What is an effect of improper pump alignment Correct Answer: Vibration What kind of material is used to anchor pipe bends (to brace pipe joints and fittings) Correct Answer: Concrete Why should serve lines be installed with a "gooseneck"in the pipe Correct Answer: To allow for earth movements as well as expansions and contractions due to temperature changes
Correct Answer: the active representative connections The minimum number of samples required in a coli form sample sitting plan is determined by Correct Answer: Regulatory agency based on population How manny 20 foot joints of pvc pipe would you need to complete a 1.3 mile section of pipe will it take Correct Answer: 5. (352) If you are going to lay 1.5 miles of water main how many 20 foot sections of pipe will it take Correct Answer: 396 joints How manny cubic yards of dirt would be removed if a ditch is dug 6 foot deep, 8 foot wide, and 3.5 feet long Correct Answer: 105 cu yards If the desired dosage is 6.4 mg l and the demand is 3.1 mg l what is the residual Correct Answer: 3. If the chlorine demand is 2.3 and the desired chlorine residual is 0.2 what is dosage required
Correct Answer: 2. What is "c" factor Correct Answer: Pipe interior smoothness The most important use of chlorine in water treatment is Correct Answer: Disinfect Need to find out what is osha and what it means Correct Answer: The safety health act provides a safe work place A non-permit space by osha standards means a confined space that Correct Answer: Does not contain or have the potential to contain any hazard capable of causing death
