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BASIC WASTEWATER OPERATOR PRACTICE EXAM QUESTIONS AND ANSWERS
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BASIC WASTEWATER OPERATOR PRACTICE EXAM QUESTIONS AND ANSWERS
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Name: Score:125 Multiple choice questions
Term 1 of 125
What is the correct valve position when starting a reciprocating pump?
in valve open; out valve open
in valve closed; out valve closed
in valve closed; out valve open
in valve open; out valve closed
Term 2 of 125
The rock in a trickling filter is usually placed where?
around the outer edge of the filter
in the center of the filter
on the tile underdrain system
at the discharge of the filter
Term 3 of 125
What part of a chlorine cylinder is designed to melt at 150 to 160 degrees F to prevent the
cylinder from exploding in the event of a fire?
mucus plug
fusible plug
cork stopper
fire plug
,Term 4 of 125
What is the purpose for adding copper sulfamic acid to a D.O. sample?
to increase the pH
as an inhibitor solution for the DO analysis using the APHA method
to kill bacteria
to increase biological activity
Term 5 of 125
The ammonia loading on a plant is increasing. What should the operator expect regarding the
amount of alkalinity in the system?
the alkalinity will decrease
the alkalinity will remain the same
the alkalinity will not change
ammonia has nothing to do with alkalinity
Term 6 of 125
Calculate SRT
Given: MLSS = 2400 mg/L
Aeration basin volume = 35,000 gallons = 0.0350 MG
WAS concentration = 3500 mg/L
WAS flow rate = 0.001 MGD
6 hours
6 days
24 hours
24 days
,Term 7 of 125
What is one component of a centrifugal pump?
impeller
primer
hose bib
piston
Term 8 of 125
What does a chlorine demand test indicate?
the amount of chlorine required to give a desired chlorine residual after a given time
the amount of chlorine required to give a desired chlorine dosage after a given time
the amount of chlorine required to meet EPD requirements
the amount of chlorine required to give chlorine residual after 15 minutes
Term 9 of 125
A composite sample must be?
sporadically collected in the treatment plant
taken at one time
analyzed immediately
representative and sub-samples time spaced over 15 minutes apart
Term 10 of 125
Calculate the pounds per day of chemical dosage with a flow of 5 MGD doing at a rate of 218
ppm.
1090 lbs/day
9090 lbs/day
8153.2 lbs/day
1818 lbs/day
, Term 11 of 125
What factors control the throat size in a chlorinator?
chlorine pressure
type of chlorine used
water pressure
distance to injection point
Term 12 of 125
What controls the rotational speed of the air drive biological contactor (RBC)?
water volume
bacteria growth
air volume
amount of suds
Term 13 of 125
What immediate first aid should be given for burns?
hot compress
clean with an antiseptic
flush with cold water
cover tightly with bandage
Term 14 of 125
Why are approved black flow devices installed above ground level?
ease of access
because the plummers union requires it
cost of vault
to keep valves from being submerged
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