Wastewater Treatment Grade 1 Exam
Questions with Answers
Hypochlorinators can become clogged with calcium carbonate. This material can be removed by
pumping a dilute solution of ________________ through the pump, hoses, and diffuser. -
✔✔HCl - Hydrochloric Acid
Chlorine gas can kill a person after just a few breaths at concentrations as low as
_____________. - ✔✔0.1%
What is the purpose of packing in a pump? - ✔✔Control water leakage along the pump's shaft
What is motor horsepower? - ✔✔The horsepower equivalent to the watts of electric power
supplied to a motor
A shaft transmits _________________ from the motor to the impeller. - ✔✔Torque
To prevent frosting, what is the maximum withdrawal rate for a 1-ton chlorine container with a
backpressure of 35 psi at room temperature? - ✔✔400 lbs/day
What is brake horsepower? - ✔✔The power supplied to a pump by a motor
What is the primary reason filters are difficult to clean? - ✔✔Sticky floc adsorbs to the media
What is water horsepower? - ✔✔The portion of the power delivered to a pump that is actually
used to lift water
,Chlorine scrubbers are designed to neutralize up to ____________lbs of chlorine. - ✔✔2,000
lbs
There are many causes for bearing failure, what is the most common reason? - ✔✔Poor
lubrication practices
What metal will be the anode from the following list because it is most active?
A) Tin
B) Brass
C) Mild Steel
D) Copper - ✔✔C) Mild Steel
What kind of water is a poor conductor of electricity? - ✔✔Deionized water
Destruction of pathogenic organisms by chlorine is directly related to ____________. -
✔✔Chlorine concentration and contact time
The valves on chlorine cylinders and ton containers must comply with standards set by? -
✔✔Chlorine Institute
Surface wash systems for filters agitate the top ______________ inches of media. - ✔✔2 inches
What disinfection treatment process requires a monitoring procedure, other than residual
monitoring, to determine its efficiency? - ✔✔Ultraviolet
As water flows through the volute, the pressure head ___________________ and the velocity
head _____________________. - ✔✔Increases, decreases
, A pressure-differential meter is a flow-measuring device that creates and measures a difference
in pressure ________________________ to the rate of flow. - ✔✔Proportional
The following procedure is safe for changing out chlorine cylinders or 1-ton containers:
A) After removing the brass outlet cap, clean the valve and threads with a wire brush
B) Always use a new washer
C) Always have a personal protective respirator nearby
D) All of the above - ✔✔D - All of the above
What is the most difficult and expensive physical measurement taken in a water plant? -
✔✔Water Flow
If a treatment plant softens water, where should samples be collected to determine if the
desired result of softening has been achieved? - ✔✔Immediately after softening and before the
clear well
Coliform bacteria will produce gas in lactose or lauryl tryptose broth at 35.5C within
______________ hours. - ✔✔24-48 Hours
The number of samples under the Total Coliform Rule that a water system must collect depends
on the _________________. - ✔✔Number of customers served
Drinking water samples to be tested for total coliforms should be tested the same day they are
collected, but they can be refrigerated for __________________ hours before analysis. - ✔✔8
hours
What type of laboratory equipment is highly resistant to heat, sudden temperature change, and
chemical attack? - ✔✔Porcelain dishes
Questions with Answers
Hypochlorinators can become clogged with calcium carbonate. This material can be removed by
pumping a dilute solution of ________________ through the pump, hoses, and diffuser. -
✔✔HCl - Hydrochloric Acid
Chlorine gas can kill a person after just a few breaths at concentrations as low as
_____________. - ✔✔0.1%
What is the purpose of packing in a pump? - ✔✔Control water leakage along the pump's shaft
What is motor horsepower? - ✔✔The horsepower equivalent to the watts of electric power
supplied to a motor
A shaft transmits _________________ from the motor to the impeller. - ✔✔Torque
To prevent frosting, what is the maximum withdrawal rate for a 1-ton chlorine container with a
backpressure of 35 psi at room temperature? - ✔✔400 lbs/day
What is brake horsepower? - ✔✔The power supplied to a pump by a motor
What is the primary reason filters are difficult to clean? - ✔✔Sticky floc adsorbs to the media
What is water horsepower? - ✔✔The portion of the power delivered to a pump that is actually
used to lift water
,Chlorine scrubbers are designed to neutralize up to ____________lbs of chlorine. - ✔✔2,000
lbs
There are many causes for bearing failure, what is the most common reason? - ✔✔Poor
lubrication practices
What metal will be the anode from the following list because it is most active?
A) Tin
B) Brass
C) Mild Steel
D) Copper - ✔✔C) Mild Steel
What kind of water is a poor conductor of electricity? - ✔✔Deionized water
Destruction of pathogenic organisms by chlorine is directly related to ____________. -
✔✔Chlorine concentration and contact time
The valves on chlorine cylinders and ton containers must comply with standards set by? -
✔✔Chlorine Institute
Surface wash systems for filters agitate the top ______________ inches of media. - ✔✔2 inches
What disinfection treatment process requires a monitoring procedure, other than residual
monitoring, to determine its efficiency? - ✔✔Ultraviolet
As water flows through the volute, the pressure head ___________________ and the velocity
head _____________________. - ✔✔Increases, decreases
, A pressure-differential meter is a flow-measuring device that creates and measures a difference
in pressure ________________________ to the rate of flow. - ✔✔Proportional
The following procedure is safe for changing out chlorine cylinders or 1-ton containers:
A) After removing the brass outlet cap, clean the valve and threads with a wire brush
B) Always use a new washer
C) Always have a personal protective respirator nearby
D) All of the above - ✔✔D - All of the above
What is the most difficult and expensive physical measurement taken in a water plant? -
✔✔Water Flow
If a treatment plant softens water, where should samples be collected to determine if the
desired result of softening has been achieved? - ✔✔Immediately after softening and before the
clear well
Coliform bacteria will produce gas in lactose or lauryl tryptose broth at 35.5C within
______________ hours. - ✔✔24-48 Hours
The number of samples under the Total Coliform Rule that a water system must collect depends
on the _________________. - ✔✔Number of customers served
Drinking water samples to be tested for total coliforms should be tested the same day they are
collected, but they can be refrigerated for __________________ hours before analysis. - ✔✔8
hours
What type of laboratory equipment is highly resistant to heat, sudden temperature change, and
chemical attack? - ✔✔Porcelain dishes
