Texas Wastewater Class A Questions and Correct Detailed Answers (Verified Answers) ||Already Graded A+||Newest Version

Texas Wastewater Class A Questions and Correct
Detailed Answers (Verified Answers) ||Already
Graded A+||Newest Version
Quiz: Seeding of BOD samples is necessary when samples

Ans: (All of the above) have a chlorine residual, have a previously been
chlorinated, have been subjected to high temperatures, contain high or low pH
industrial wastes



Quiz: When is blue-green algae the most dominant on a pond treatment

system?

Ans: Summer



Quiz: A 30-inch diameter wastewater interceptor is observed to be

flowing half-full at about two fps. The approximate volume of wastewater

flowing through the pipe is 3.14x1.25 x 1.25 x 2 = 4.9 cfs x 449 = 2,200 gpm

Ans: c. 2,200 gallons per minute



Quiz: A one-cylinder reciprocating sludge pump with a 10-inch bore and a

5-inch stroke pumps at a rate of 50 cycles per minute. How many minutes


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, must the pump be operated to pump 5,000 gallons of sludge? 3.14x0.416 x

0.416 x0.416 x 50 x7.48 = 84.5 gpm 5000 gal = 59,2min 84.5 gpm b. 29

Ans: 60 minutes



Quiz: If an existing centrifugal pump motor is replaced with a motor with

25 percent more speed, the motor horsepower required will increase by 1.25

x 1.25 x 1.25 = 1.95

Ans: 95 percent



Quiz: When must TCEQ be notified about expansions of a treatment

facility?

Ans: Before construction



Quiz: In an anaerobic digester, the percentage of methane and carbon

dioxide gas content should be

Ans: 70% methane, 30% carbon dioxide




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, Quiz: The temperature of an anaerobic digester should be maintained at a

minimum of

Ans: 95° F



Quiz: What type of wastewater treatment operates in the endogenous

bacteria growth phase?

Ans: Extended air



Quiz: Why is recirculation needed in a trickling filter?

Ans: Keep the media wet Further reduce BOD All of the above (a, b, and c)



Quiz: What type of fire extinguisher would be used on an electrical

control panel that has been de-energized?

Ans: Class A Class C (a and d)



Quiz: Disinfection with chlorine is the most effective at a pH of

Ans: 6.0



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, Quiz: The biomass on a normal functioning RBC has what appearance?

Ans: Grey to brown and 0.05 to 0.1 inch thick



Quiz: The sludge from a primary clarifier should percent solids?

Ans: 4% to 6%



Quiz: What is eutrophication in a pond system?

Ans: Enrichment with nitrogen and phosphorous Causes algae blooms (b and
c)



Quiz: How often should pH meters be calibrated?

Ans: Daily



Quiz: In Texas, pH meters are required to be calibrated on how many

buffers?

Ans: two




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