Wastewater Class B Texas questions with CORRECT

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Wastewater Class B Texas questions with CORRECT ANSWERs

Question 1: The name of the State Agency responsible for

enforcing pollution control laws in Texas

CORRECT ANSWER : Texas Commission of Environmental

Quality

Question 2: The term pathogenic means

CORRECT ANSWER : Capable of causing disease

Question 3: The minimum separation between sewer lines and

potable water lines is

CORRECT ANSWER : 9 feet

Question 4: A licensed wastewater operator is a professional

CORRECT ANSWER : consistently does best job possible,

practices personal safety, strives to improve job knowledge, strives to keep the plant and collection system in the best appearance and working order

Question 5: An important step in testing a sample for Total

Suspended Solids is

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CORRECT ANSWER : Filtering a sample

Question 6: The Biochemical oxygen Demand (BOD) of a

sample is based on

CORRECT ANSWER : Measuring the dissolved oxygen (DO)

used

Question 7: The results of Biochemical Oxygen Demand (BOD)

sample taken at a treatment plant tells the operator

CORRECT ANSWER : How the plant was operating 5 days ago

Question 8: Which of the following are dangerous gasses that

are likely to be present in lift stations and manholes?

CORRECT ANSWER : Natural gas, gasoline fumes, hydrogen

sulfide and carbon dioxide

Question 9: A preferred hydraulic method of cleaning sewer

lines is

CORRECT ANSWER : Hydro Jet Cleaner

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Question 10: Ways to reduce bad odors coming from a

collection system

CORRECT ANSWER : routinely cleaning slow running or low

flow lines, adding chlorine or hydrogen peroxide to the collection system

Question 11: Types of pipe that are commonly used in

wastewater collection system

CORRECT ANSWER : ductile iron, Poly Vinyl Chloride (PVC)

Question 12: Before entering a confined space a worker should

CORRECT ANSWER : Use approved monitoring device and

check for the presence of dangerous gasses, ventilate the space with a blower, wear a safety harness and attach a life line

Question 13: A properly designed and operated primary

sedimentation tank should remove _____ percent of incoming BOD

CORRECT ANSWER : 30-40%

Question 14: Devices that may be used to determine the level of

sewage in a lift station

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CORRECT ANSWER : air bubbler, floats, electrodes, Acoustic

(sonic)

Question 15: What is the most important role of aerobic bacteria

in the treatment of wastewater?

CORRECT ANSWER : decompose organic matter

Question 16: The hydraulic loading of a trickling filter may be

determined by

CORRECT ANSWER : flow rate and filter area

Question 17: These can be used to dewater sludge

CORRECT ANSWER : belt press, drying beds, solid bowl

centrifuge, gravity thickener

Question 18: Most important to providing adequate sewage

treatment in a stabilization pond

CORRECT ANSWER : sunlight, algae, bacteria and time

Question 19: Offensive and objectionable odors which

sometimes occur in trickling filters usually indicate