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1 TEXAS WASTEWATER CLASS A EXAM VERSION 1, 2 & 3
WITH A BONUS PRACTICE TEST 450 QUESTIONS AND
CORRECT DETAILED ANSWERS EXCELLENT TOOL TO
STUDY TEXAS WASTEWATER COURSE
Texas Wastewater Class A Exam test 1 Why is recirculation needed in a trickling filter? - ANSWER-Keep the media wet Further reduce BOD All of the above (a, b, and c)
What type of fire extinguisher would be used on an electrical control panel that has been de- energized? - ANSWER-Class A Class C (a and d)
Disinfection with chlorine is the most effective at a pH of - ANSWER-6.0
The biomass on a normal functioning RBC has what appearance? - ANSWER-Grey to brown and 0.05 to 0.1 inch thick
The sludge from a primary clarifier should percent solids? - ANSWER-4% to 6%
What is eutrophication in a pond system? - ANSWER-Enrichment with nitrogen and phosphorous Causes algae blooms (b and c)
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2 How often should pH meters be calibrated? - ANSWER-Daily
In Texas, pH meters are required to be calibrated on how many buffers? - ANSWER-two
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 - ANSWER-2941
The parameters of the BOD test are - ANSWER-5 days at 20° Centigrade
Standard Dimension Ratio in pvc pipe is defined as - ANSWER-Ratio of OD pipe diameter to wall thickness
How should shoring be removed from a trench? - ANSWER-up from the bottom up
In low pressure sewer systems where each tap must have a grinder pump lift station, station is considered to be - ANSWER-part of the collection system and the responsibility of the utility
Effective communication depends on - ANSWER-being a good listener
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3 When designing a wastewater collection system, the engineer considers the population for how many years in the future? - ANSWER-50
According to 30 TAC Chapter 317, all pipe and fittings used in wastewater pressure shall have a minimum psi pressure rating of - ANSWER-150
The minimum velocity of flow in a wastewater line should be - ANSWER-2.0 fps
At a construction job site, as the roadway speed increases, the spacing between cones and barricades should - ANSWER-increase
The major cause of wastewater line stoppages is - ANSWER-roots and grease
Carbon monoxide (CO) poisoning symptoms are - ANSWER-tightness in the chest nausea drowsiness and headache (all of the above)
The smallest pipe size for air recirculation of a self-priming centrifugal pump is - ANSWER-1 inch
Dangerous gases in a confined space may not be detected with the physical senses because - ANSWER-some gases have no odor some gases may deaden the sense of smell some gases may displace the oxygen (all of the above) 3 / 4
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What are the dangerous gases a collection system worker might come into contact with? - ANSWER-CO2 CO НaS CH4 (all of the above)
On a construction job site, equipment booms must maintain at least how many feet of clearance from overhead electric lines? - ANSWER-10
How should trench shoring be installed? - ANSWER-to above the top of the trench
When setting work goals for an employee, the goals should be - ANSWER-accompanied by an action plan
According to Chapter 317, Design Criteria, a manhole can be installed within 9 feet of an existing waterline if - ANSWER-the manhole is completely watertight and tested for no leakage
As the population of a collection system increases, the ratio of peak flow to average daily flow will - ANSWER-decrease
Motivating workers to do a better job is best done by - ANSWER-letting workers participate in setting goals
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