Water Operator Class D Study Guide Questions With
Complete Solutions
1 cubic foot = ? gallons Correct Answers 7.48 gallons
1 day (24 hours) = ? minutes Correct Answers 1440
1 foot of water column = ? psi Correct Answers .433 psi
1 gallon = ? lbs (pounds) Correct Answers 8.34 pounds
1 mg/L of water equals Correct Answers 1 ppm by weight
1 mile = ? feet Correct Answers 5280
1 psi = ? feet of water column Correct Answers 2.31 feet
1000 feet Correct Answers The distance that boat ramps, docks
and fishing peirs must be away from a water intake
5 things that effect Coagulation Correct Answers Turbidity, pH,
Temperature, Alkalinity, Chemical dosage
9 out of 10 accidents are caused by Correct Answers unsafe acts
of the person injured or someone else
A "community" water system is described as? Correct Answers
A public water system that has a potential to serve at least 15
service connections on a year round basis or serves at least 25
individuals on a year round basis.
,A Chlorinator room's fan switch must be located Correct
Answers outside the room
A Class C Water Operator License is valid for how long?
Correct Answers 3 years
A Class D Water Operator License is valid for how long?
Correct Answers 2 years
A Class D water operator license/certificate is only valid for this
type of system. Correct Answers Ground water systems with
less than 250 connections
a cleanout is not designed for Correct Answers personnel entry
A copy of Consumer Confidence reports (EPA Required)must
be kept for Correct Answers 5 years
A corporation stop operation Correct Answers it cannot be
operated from the ground's surface, because it is buried under
ground
A Cylinder apparatus inlet valve allows Correct Answers gas to
enter the apparatus
A cylinder ejector allows this Correct Answers allows chlorine
to pass into the water supply
A filter must be backwashed when head loss is Correct Answers
approximately 6 to 10 feet
,A gallon of water weighs Correct Answers 8.34 pounds
A mechanical chock caused by pump cavitation does this
Correct Answers chips metal away from the impeller or casing
A mechanical retrieval device must be attached to the retrieval
line when entering Correct Answers a vertical entry of 5 feet or
more
A Negative Bacteriological Sample means that: Correct
Answers coliform was not found
A NON-ACUTE Risk violation occurs when Correct Answers
A routine TOTAL Coliform sample is positive THEN A repeat
TOTAL coliform sample is positive
A non-transient non-community water system (NTNCWS) is?
Correct Answers A public system that regularly serves at least
25 of the same persons more than 6 months of the year.
A pH of 6.5 is Correct Answers slightly acidic
A pH of 7.8 is Correct Answers slightly Basic
A Positive Bacteriological Sample means that: Correct Answers
coliform was found
a positive displacement meter cannot over-register due to
Correct Answers external influence or internal wear
, A positive fecal coliform water sample is considered Correct
Answers Alarming
A positive sample may be removed from your record when
Correct Answers repeat samples are negative AND the
system(you) explains why the positive sample was not
representative
A pump turning backward can cause Correct Answers
unscrewing of the drive shaft coupling; damage to the pump or
pump motor if the pump suddently starts
A rotameter does this Correct Answers measures the gas
moving through the cylinder apparatus
A rotameter measures gas in Correct Answers lbs/day or
grams/hour
A sample container cannot be any older than Correct Answers 6
months
A sample must be received by the lab within: Correct Answers
30 hours
A sample-siting plan assures that Correct Answers samples are
taken from active Representative services
A screen's mesh size is determined by 3 things. What are they?
Correct Answers size of the aquifer material; size of the gravel
in the gravel pack; type of well development
Complete Solutions
1 cubic foot = ? gallons Correct Answers 7.48 gallons
1 day (24 hours) = ? minutes Correct Answers 1440
1 foot of water column = ? psi Correct Answers .433 psi
1 gallon = ? lbs (pounds) Correct Answers 8.34 pounds
1 mg/L of water equals Correct Answers 1 ppm by weight
1 mile = ? feet Correct Answers 5280
1 psi = ? feet of water column Correct Answers 2.31 feet
1000 feet Correct Answers The distance that boat ramps, docks
and fishing peirs must be away from a water intake
5 things that effect Coagulation Correct Answers Turbidity, pH,
Temperature, Alkalinity, Chemical dosage
9 out of 10 accidents are caused by Correct Answers unsafe acts
of the person injured or someone else
A "community" water system is described as? Correct Answers
A public water system that has a potential to serve at least 15
service connections on a year round basis or serves at least 25
individuals on a year round basis.
,A Chlorinator room's fan switch must be located Correct
Answers outside the room
A Class C Water Operator License is valid for how long?
Correct Answers 3 years
A Class D Water Operator License is valid for how long?
Correct Answers 2 years
A Class D water operator license/certificate is only valid for this
type of system. Correct Answers Ground water systems with
less than 250 connections
a cleanout is not designed for Correct Answers personnel entry
A copy of Consumer Confidence reports (EPA Required)must
be kept for Correct Answers 5 years
A corporation stop operation Correct Answers it cannot be
operated from the ground's surface, because it is buried under
ground
A Cylinder apparatus inlet valve allows Correct Answers gas to
enter the apparatus
A cylinder ejector allows this Correct Answers allows chlorine
to pass into the water supply
A filter must be backwashed when head loss is Correct Answers
approximately 6 to 10 feet
,A gallon of water weighs Correct Answers 8.34 pounds
A mechanical chock caused by pump cavitation does this
Correct Answers chips metal away from the impeller or casing
A mechanical retrieval device must be attached to the retrieval
line when entering Correct Answers a vertical entry of 5 feet or
more
A Negative Bacteriological Sample means that: Correct
Answers coliform was not found
A NON-ACUTE Risk violation occurs when Correct Answers
A routine TOTAL Coliform sample is positive THEN A repeat
TOTAL coliform sample is positive
A non-transient non-community water system (NTNCWS) is?
Correct Answers A public system that regularly serves at least
25 of the same persons more than 6 months of the year.
A pH of 6.5 is Correct Answers slightly acidic
A pH of 7.8 is Correct Answers slightly Basic
A Positive Bacteriological Sample means that: Correct Answers
coliform was found
a positive displacement meter cannot over-register due to
Correct Answers external influence or internal wear
, A positive fecal coliform water sample is considered Correct
Answers Alarming
A positive sample may be removed from your record when
Correct Answers repeat samples are negative AND the
system(you) explains why the positive sample was not
representative
A pump turning backward can cause Correct Answers
unscrewing of the drive shaft coupling; damage to the pump or
pump motor if the pump suddently starts
A rotameter does this Correct Answers measures the gas
moving through the cylinder apparatus
A rotameter measures gas in Correct Answers lbs/day or
grams/hour
A sample container cannot be any older than Correct Answers 6
months
A sample must be received by the lab within: Correct Answers
30 hours
A sample-siting plan assures that Correct Answers samples are
taken from active Representative services
A screen's mesh size is determined by 3 things. What are they?
Correct Answers size of the aquifer material; size of the gravel
in the gravel pack; type of well development
