Exam (elaborations)
CA GRADE 2 WASTEWATER TREATMENT OPERATOR PRACTICE EXAM 1 QUESTIONS AND ANSWERS
- Course
- Institution
CA GRADE 2 WASTEWATER TREATMENT OPERATOR PRACTICE EXAM 1 QUESTIONS AND ANSWERS
[Show more]
Content preview
Name: Score:80 Multiple choice questions
Term 1 of 80
How much dissolved oxygen should be in a conventional activated sludge system if good
effluent is being produced?
102 to 4 mg/l
0.5 to 1 mg/l
2 to 4 mg/l
2 to 96 mg/l
Term 2 of 80
What might cause thick billows of white sudsy foam in the aeration tank?
MLSS is too low
Mlss is too high
Gasification from aging sludge
Temperature in the aeration tank is too low
Term 3 of 80
What is the differnce between the sludge from a primary clarifier and a secondary clarifier?
dissolved oxygen, temperature, and pH
primary sludge is denser than secondary
test for the biochemical oxygen demand
The BOD bottle should be completely filled to the top
,Term 4 of 80
What is the equivalent of 1 mg/l?
0.5 ppm
10 ppm
5 ppm
1 ppm
Term 5 of 80
What should you do if you are mildly exposed to chlorine gas?
immediately evacuate the contaminated area, remian calm, keep warm. breath lightly,
avoid coughing
stay in the area and try to identify the source of the chlorine gas
drink plenty of water to dilute the chlorine gas in your system
cover your mouth with a cloth and continue working as normal
Term 6 of 80
What is the health effect of carbon dioxide?
to prevent short circuiting
cross connection
migraine
could lead to asphyxiation
Term 7 of 80
What should be done if a large amount of organic matter is found in the grit channel?
check the composite sample of tss
measure the flow rate
increase the velocity of the wastewater
increase the chlorine demand
,Term 8 of 80
Which flow rate should you use to calculate the hydraulic loading to a trickling filter?
filamentous bacteria
plant inflow plus recirculated flow
measure the flow rate
recirculate activated sludge
Term 9 of 80
Which is true about the temperature in an anaerobic digester?
Temperature in a digester should be maintained at a constant 100 degrees fahrenheit
Temperature in a digester should not be changed by more than 1 degree Fahrenheit per
day
Temperature in a digester can fluctuate freely without affecting the process
Temperature in a digester is irrelevant to the digestion process
Term 10 of 80
What is the first step of the lockout/tagout procedure?
notify all affected employees that a lockout/tagout system is going to be used and the
reason why
they are indirect measurements of the organic content in the influent
the three main parts of a trickling filter are media, distribution system, and underdrain
addition of chlorine to wastewater at the entrance to the plant used for odor control,
BOD reduction, grease removal, and aid sedimentation
, Term 11 of 80
What is freeboard in a waste stabilization pond?
the area of the pond that is exposed to sunlight
the vertical distance from normal water surface to the top of the levee
the depth of the water in the pond at any given time
wooden inlet and outlet
Term 12 of 80
What is the correct formula for solids in raw wastewater?
Total solids = settleable solids + dissolved solids
Recirculate activated sludge
Total solids - settleable solids = non settleable solids
Non settleable solids + settleable solids = total suspended solids
Term 13 of 80
How does an activated sludge system remove watse from wastewater?
facultative bacteria
physical treatment
biological treatment
biochemical process
Term 14 of 80
The purpose of disinfection is to?
facultative bacteria
destruction or inactivation of pathogenic bacteria
reduce the volume of the sludge and stabilize the solids
kill all microorganisms in the wastewater
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller selftest. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
76710 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now