ILLINOIS CLASS D WATER LICENSE EXAM /ACTUAL EXAM
2025/2026 | COMPLETE ALL REAL EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS )| ALREADY
GRADED A+ | LATEST EXAM .
What is an altitude valve? - ANSWER-A valve that automatically
shuts off the flow into an elevated tank when the water level in
the tank reaches a predetermined level. The valve automatically
opens when the pressure in the distribution system drops the
pressure in the tank
What is the purpose of a check valve? - ANSWER-Acts as an
automatic shut off valve when a pump stops, acts to keep water
that's has already entered the system from flowing back into
the well casing, and helps prevent system pressure from
decreasing due to backsiphonage.
If a well pump motor is wired backwards the well pump will
______________? - ANSWER-Still pump some water
A water plant has a lineshaft well. The operator replaces the
packing in the packing gland on the motor. After the packing
,has been replaced there should be ___________? - ANSWER-A
small trickle of water when the pump is operating.
A pump housing which obtains its power from a side shaft
electric motor airlocks. The pump itself is extremely hot to
touch. How do you correct this problem? - ANSWER-Leave the
motor on, open the spigot, and allow the irritably off into the
water flows from the Spigot
Pump cavitation is most likely to occur when the top of the
water source level is______________? - ANSWER-When the
water level is changing two levels above and below the impeller
When cavitation is occurring what sounds usually present -
ANSWER-Loud noises that sound like someone's pounding on
the impeller with a hammer
What is a Ranney well? - ANSWER-A dug well with lateral
screens which laboreisis it to under a nearby river
What is well yield? - ANSWER-The amount of water that can be
collected before given use from Wells for surface sources
, Grease should be added to a pump motor
until______________? – ANSWER-New grease comes out of the
grease club
Copper service freezes solid in winter. What options does the
operator have in thawing the line? - ANSWER-Electrical thawing
A meter located in a mirror pit freezes in winter. what is the best
option that the operator has in thawing the line - ANSWER-Use
hot air heated obtained from the tailpipe of a vehicle
What is the minimum flow velocity that hydrant should be
flushed to adequately flush the line - ANSWER-100
gallons/minute
Fire hydrants in Eleanor Maine are of the dry barrel type. Why
does a dry barrel hydrant have to be completely opened when
operating - ANSWER-To get the maximum flow from the
hydrant and to run the water from flowing from the weep hole
during use which can saturate the drainfield.
The minimum vertical gap in an air gap should never be less
than________________? - ANSWER-Twice the diameter of the
discharge pipe
2025/2026 | COMPLETE ALL REAL EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS )| ALREADY
GRADED A+ | LATEST EXAM .
What is an altitude valve? - ANSWER-A valve that automatically
shuts off the flow into an elevated tank when the water level in
the tank reaches a predetermined level. The valve automatically
opens when the pressure in the distribution system drops the
pressure in the tank
What is the purpose of a check valve? - ANSWER-Acts as an
automatic shut off valve when a pump stops, acts to keep water
that's has already entered the system from flowing back into
the well casing, and helps prevent system pressure from
decreasing due to backsiphonage.
If a well pump motor is wired backwards the well pump will
______________? - ANSWER-Still pump some water
A water plant has a lineshaft well. The operator replaces the
packing in the packing gland on the motor. After the packing
,has been replaced there should be ___________? - ANSWER-A
small trickle of water when the pump is operating.
A pump housing which obtains its power from a side shaft
electric motor airlocks. The pump itself is extremely hot to
touch. How do you correct this problem? - ANSWER-Leave the
motor on, open the spigot, and allow the irritably off into the
water flows from the Spigot
Pump cavitation is most likely to occur when the top of the
water source level is______________? - ANSWER-When the
water level is changing two levels above and below the impeller
When cavitation is occurring what sounds usually present -
ANSWER-Loud noises that sound like someone's pounding on
the impeller with a hammer
What is a Ranney well? - ANSWER-A dug well with lateral
screens which laboreisis it to under a nearby river
What is well yield? - ANSWER-The amount of water that can be
collected before given use from Wells for surface sources
, Grease should be added to a pump motor
until______________? – ANSWER-New grease comes out of the
grease club
Copper service freezes solid in winter. What options does the
operator have in thawing the line? - ANSWER-Electrical thawing
A meter located in a mirror pit freezes in winter. what is the best
option that the operator has in thawing the line - ANSWER-Use
hot air heated obtained from the tailpipe of a vehicle
What is the minimum flow velocity that hydrant should be
flushed to adequately flush the line - ANSWER-100
gallons/minute
Fire hydrants in Eleanor Maine are of the dry barrel type. Why
does a dry barrel hydrant have to be completely opened when
operating - ANSWER-To get the maximum flow from the
hydrant and to run the water from flowing from the weep hole
during use which can saturate the drainfield.
The minimum vertical gap in an air gap should never be less
than________________? - ANSWER-Twice the diameter of the
discharge pipe
