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texas wastewater class a newest actual
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TEXAS WASTEWATER CLASS A
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TEXAS WASTEWATER CLASS A NEWEST ACTUAL EXAM
COMPLETE 190 QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
1.Seeding of BOD samples is necessary when samples: (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
2.When is blue-green algae the most dominant on a pond treatment system?
-
: Summer
3. If an operations company ceases its operation or is sold such that
con- trol of the company is transferred to another party,: the company's
operations certificate is revoked
4.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: c. 2,200
gallons per minute
5.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
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: 60
minutes
6.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: 95 percent
7.What type of wastewater treatment operates in the endogenous bacteria
growth phase?: Extended air
8. Why is recirculation needed in a trickling filter?: Keep the media wet
Further reduce BOD All of the above (a, b, and c)
9. What type of fire extinguisher would be used on an electrical control
panel that has been de-energized?: Class A Class C (a and d)
10.Disinfection with chlorine is the most effective at a pH of: 6.0
11.The biomass on a normal functioning RBC has what appearance?: Grey
to brown and 0.05 to 0.1 inch thick
12.The sludge from a primary clarifier should percent solids?: 4% to 6%
13.What is eutrophication in a pond system?: Enrichment with nitrogen
,and phosphorous Causes algae blooms (b and c)
14.How often should pH meters be calibrated?: Daily
15.In Texas, pH meters are required to be calibrated on how many buffers?:
two
, 16.An industrial complex has a BOD discharge to the POTW of 500 pounds
per day. The population equivalent of this industry is 500 lbs = 2,941 0.17
lbs BOD person: 2941
17.The parameters of the BOD test are: 5 days at 20° Centigrade
18.Standard Dimension Ratio in pvc pipe is defined as: Ratio of OD
pipe diameter to wall thickness
19.How should shoring be removed from a trench?: up from the bottom up
20.In low pressure sewer systems where each tap must have a grinder
pump lift station, station is considered to be: part of the collection system
and the responsibility of the utility
21.Effective communication depends on: being a good listener
22.When designing a wastewater collection system, the engineer
considers the population for how many years in the future?: 50
23.According to 30 TAC Chapter 317, all pipe and fittings used in
wastewater pressure shall have a minimum psi pressure rating of: 150
24.The minimum velocity of flow in a wastewater line should be: 2.0 fps
25.At a construction job site, as the roadway speed increases, the
spacing between cones and barricades should: increase
26.The major cause of wastewater line stoppages is: roots and grease
27.Carbon monoxide (CO) poisoning symptoms are: tightness in the
chest nausea drowsiness and headache (all of the above)
28.The smallest pipe size for air recirculation of a self-priming
centrifugal pump is: 1 inch
29.Dangerous gases in a confined space may not be detected with the
physi- cal senses because: some gases have no odor some gases may
deaden the sense of smell some gases may displace the oxygen (all of
the above)
30.What are the dangerous gases a collection system worker might come
into contact with?: CO2 CO aS CH4 (all of the above)
31.On a construction job site, equipment booms must maintain at least
how many feet of clearance from overhead electric lines?: 10
32.How should trench shoring be installed?: to above the top of the trench
33.When setting work goals for an employee, the goals should be:
accompa- nied by an action plan
34.According to Chapter 317, Design Criteria, a manhole can be installed
within 9 feet of an existing waterline if: the manhole is completely
watertight and tested for no leakage
35.As the population of a collection system increases, the ratio of peak
flow to average daily flow will: decrease
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