ADEQ WATER TREATMENT GRADE 1
EXAM QUESTIONS AND ANSWERS
2026/2027
Hypochlorinators can become clogged with calcium carbonate. This material can be
removed by pumping a dilute solution of ________________ through the pump, hoses,
and diffuser. - ANSWERSHCl - Hydrochloric Acid
Chlorine gas can kill a person after just a few breaths at concentrations as low as
_____________. - ANSWERS0.1%
What is the purpose of packing in a pump? - ANSWERSControl water leakage along
the pump's shaft
What is motor horsepower? - ANSWERSThe horsepower equivalent to the watts of
electric power supplied to a motor
A shaft transmits _________________ from the motor to the impeller. -
ANSWERSTorque
To prevent frosting, what is the maximum withdrawal rate for a 1-ton chlorine container
with a backpressure of 35 psi at room temperature? - ANSWERS400 lbs/day
What is brake horsepower? - ANSWERSThe power supplied to a pump by a motor
What is the primary reason filters are difficult to clean? - ANSWERSSticky floc adsorbs
to the media
What is water horsepower? - ANSWERSThe 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. -
ANSWERS2,000 lbs
There are many causes for bearing failure, what is the most common reason? -
ANSWERSPoor 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 - ANSWERSC) Mild Steel
, What kind of water is a poor conductor of electricity? - ANSWERSDeionized water
Destruction of pathogenic organisms by chlorine is directly related to ____________. -
ANSWERSChlorine concentration and contact time
The valves on chlorine cylinders and ton containers must comply with standards set by?
- ANSWERSChlorine Institute
Surface wash systems for filters agitate the top ______________ inches of media. -
ANSWERS2 inches
What disinfection treatment process requires a monitoring procedure, other than
residual monitoring, to determine its efficiency? - ANSWERSUltraviolet
As water flows through the volute, the pressure head ___________________ and the
velocity head _____________________. - ANSWERSIncreases, decreases
A pressure-differential meter is a flow-measuring device that creates and measures a
difference in pressure ________________________ to the rate of flow. -
ANSWERSProportional
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 - ANSWERSD - All of the above
What is the most difficult and expensive physical measurement taken in a water plant? -
ANSWERSWater Flow
If a treatment plant softens water, where should samples be collected to determine if the
desired result of softening has been achieved? - ANSWERSImmediately after softening
and before the clear well
Coliform bacteria will produce gas in lactose or lauryl tryptose broth at 35.5C within
______________ hours. - ANSWERS24-48 Hours
The number of samples under the Total Coliform Rule that a water system must collect
depends on the _________________. - ANSWERSNumber 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. - ANSWERS8 hours
EXAM QUESTIONS AND ANSWERS
2026/2027
Hypochlorinators can become clogged with calcium carbonate. This material can be
removed by pumping a dilute solution of ________________ through the pump, hoses,
and diffuser. - ANSWERSHCl - Hydrochloric Acid
Chlorine gas can kill a person after just a few breaths at concentrations as low as
_____________. - ANSWERS0.1%
What is the purpose of packing in a pump? - ANSWERSControl water leakage along
the pump's shaft
What is motor horsepower? - ANSWERSThe horsepower equivalent to the watts of
electric power supplied to a motor
A shaft transmits _________________ from the motor to the impeller. -
ANSWERSTorque
To prevent frosting, what is the maximum withdrawal rate for a 1-ton chlorine container
with a backpressure of 35 psi at room temperature? - ANSWERS400 lbs/day
What is brake horsepower? - ANSWERSThe power supplied to a pump by a motor
What is the primary reason filters are difficult to clean? - ANSWERSSticky floc adsorbs
to the media
What is water horsepower? - ANSWERSThe 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. -
ANSWERS2,000 lbs
There are many causes for bearing failure, what is the most common reason? -
ANSWERSPoor 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 - ANSWERSC) Mild Steel
, What kind of water is a poor conductor of electricity? - ANSWERSDeionized water
Destruction of pathogenic organisms by chlorine is directly related to ____________. -
ANSWERSChlorine concentration and contact time
The valves on chlorine cylinders and ton containers must comply with standards set by?
- ANSWERSChlorine Institute
Surface wash systems for filters agitate the top ______________ inches of media. -
ANSWERS2 inches
What disinfection treatment process requires a monitoring procedure, other than
residual monitoring, to determine its efficiency? - ANSWERSUltraviolet
As water flows through the volute, the pressure head ___________________ and the
velocity head _____________________. - ANSWERSIncreases, decreases
A pressure-differential meter is a flow-measuring device that creates and measures a
difference in pressure ________________________ to the rate of flow. -
ANSWERSProportional
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 - ANSWERSD - All of the above
What is the most difficult and expensive physical measurement taken in a water plant? -
ANSWERSWater Flow
If a treatment plant softens water, where should samples be collected to determine if the
desired result of softening has been achieved? - ANSWERSImmediately after softening
and before the clear well
Coliform bacteria will produce gas in lactose or lauryl tryptose broth at 35.5C within
______________ hours. - ANSWERS24-48 Hours
The number of samples under the Total Coliform Rule that a water system must collect
depends on the _________________. - ANSWERSNumber 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. - ANSWERS8 hours
