EXAS IRRIGATION LICENSE EXAM 2024 ACTUAL
EXAM COMPLETE 150 QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) / ALREADY GRADED A+
Absorption Rate/ Infiltration Rate - ANSWER The rate (or speed) at which soil will
accept water.
Actual Head Pressure - ANSWER The operating pressure measured at the base of a
sprinkler head. It must be equal to or greater than minimum head pressure to
function correctly.
Formula: Static Pressure-Total Pressure Loss
Air Relief Valve - ANSWER Small device used on some drip irrigation that allows air
into the dripline when the system is not running which eliminates any vacuum that
could result in debris or contaminants being sucking into the line.
Application Rate/Precipitation Rate - ANSWER Rate at which water is applied by
sprinkler heads in a certain pattern. Measure in inches per hours, gallons per hours,
or gallons per day.
Formula: 96.3 X Total GPM/ Total Area
Water Audit - ANSWER The most accurate method to evaluate precipitation rates.
You will collect water using catchment devices.
Arc - ANSWER The surface area of the landscape to which a sprinkler head will
provide water. Described in degrees or part of a full circle (360 degrees).
Example: a 90 degree arc would be a quarter circle head, a 180 degree arc would be
a half circle head, a 360 degree arc would be a full circle head.
As-Built Plan - ANSWER A corrected or redrawn plan showing the "actual scaled"
location of all major components of the system and other information the property
owner might require. Zone valves are the most important component to locate.
Atmospheric Vacuum Breaker - ANSWER A backflow prevention device that allows
air into the piping system, with the use of a float that moves up and down, to prevent
backsiphonage. This is no longer allowed in Texas.
Backflow - ANSWER An unwanted reversal of the flow of water in a piping system
which can potentially allow non-potable water to pollute or contaminate the potable
water supply.
, Backpressure - ANSWER Any condition that could create pressure in the discharge
side of the piping system that is greater than that of the supply side of the system.
This can because by gravity (due to elevation) or a pump.
Backsiphonage - ANSWER A form of backflow due to negative or sub-atmospheric
pressure within the water system. Caused by a city main like break, or the fire
department using water nearby for a fire.
Backflow Prevention Methods - ANSWER 1. Air Gap
2. Atmospheric Vacuum Breaker (Not allowed in Texas)
3. Pressure Vacuum Breaker
4. Spill Resistant Pressure Vacuum Breaker
5. Double Check Valve Assembly
6. Reduced Pressure Principle Assembly
Check Valve - ANSWER A valve which permits water to flow in one direction only.
These devices are usually located within the sprinkler head for the purpose of
preventing water in the piping to drain out of the sprinkler heads when the system is
off.
Class Pipe - ANSWER PVC pipe is groups according to the working pressure. All
sizes within a class have the same working pressure.
Controller - ANSWER An automatic timing device, which signals the automatic
valves to open or close according to the prescribed program.
Design Pressure - ANSWER The sum total of the desired head pressure added to
the total of all pressure losses.
Formula: Minimum Head Pressure + Total Pressure Losses
Distribution Uniformity - ANSWER The uniformity of the distribution of water over a
given irrigated area. It is calculated using a catchment test. Divide the average
reading of the driest 25% of catch cans by the average reading of all the catchments,
and then multiply by 100. Closer to 100% is better.
Double Check Valve Assembly - ANSWER Backflow prevention assembly, using two
shut-off valves and to check valves assembled and pre-tested at the factory,
designed to physically block or prevent backflow.
Drip Irrigation - ANSWER The slow application of water to the specific root zone of
the plant material using very low pressure. Expressed in gallons per hour.
Dry Line Shock - ANSWER The shock which occurs when a valve is opened and the
water travels unrestricted in empty piping. This happens when the water is turned on
too fast and the air can damage the pipes.
Dynamic Water - ANSWER Water that is in motion through the system as known as
working pressure.
EXAM COMPLETE 150 QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) / ALREADY GRADED A+
Absorption Rate/ Infiltration Rate - ANSWER The rate (or speed) at which soil will
accept water.
Actual Head Pressure - ANSWER The operating pressure measured at the base of a
sprinkler head. It must be equal to or greater than minimum head pressure to
function correctly.
Formula: Static Pressure-Total Pressure Loss
Air Relief Valve - ANSWER Small device used on some drip irrigation that allows air
into the dripline when the system is not running which eliminates any vacuum that
could result in debris or contaminants being sucking into the line.
Application Rate/Precipitation Rate - ANSWER Rate at which water is applied by
sprinkler heads in a certain pattern. Measure in inches per hours, gallons per hours,
or gallons per day.
Formula: 96.3 X Total GPM/ Total Area
Water Audit - ANSWER The most accurate method to evaluate precipitation rates.
You will collect water using catchment devices.
Arc - ANSWER The surface area of the landscape to which a sprinkler head will
provide water. Described in degrees or part of a full circle (360 degrees).
Example: a 90 degree arc would be a quarter circle head, a 180 degree arc would be
a half circle head, a 360 degree arc would be a full circle head.
As-Built Plan - ANSWER A corrected or redrawn plan showing the "actual scaled"
location of all major components of the system and other information the property
owner might require. Zone valves are the most important component to locate.
Atmospheric Vacuum Breaker - ANSWER A backflow prevention device that allows
air into the piping system, with the use of a float that moves up and down, to prevent
backsiphonage. This is no longer allowed in Texas.
Backflow - ANSWER An unwanted reversal of the flow of water in a piping system
which can potentially allow non-potable water to pollute or contaminate the potable
water supply.
, Backpressure - ANSWER Any condition that could create pressure in the discharge
side of the piping system that is greater than that of the supply side of the system.
This can because by gravity (due to elevation) or a pump.
Backsiphonage - ANSWER A form of backflow due to negative or sub-atmospheric
pressure within the water system. Caused by a city main like break, or the fire
department using water nearby for a fire.
Backflow Prevention Methods - ANSWER 1. Air Gap
2. Atmospheric Vacuum Breaker (Not allowed in Texas)
3. Pressure Vacuum Breaker
4. Spill Resistant Pressure Vacuum Breaker
5. Double Check Valve Assembly
6. Reduced Pressure Principle Assembly
Check Valve - ANSWER A valve which permits water to flow in one direction only.
These devices are usually located within the sprinkler head for the purpose of
preventing water in the piping to drain out of the sprinkler heads when the system is
off.
Class Pipe - ANSWER PVC pipe is groups according to the working pressure. All
sizes within a class have the same working pressure.
Controller - ANSWER An automatic timing device, which signals the automatic
valves to open or close according to the prescribed program.
Design Pressure - ANSWER The sum total of the desired head pressure added to
the total of all pressure losses.
Formula: Minimum Head Pressure + Total Pressure Losses
Distribution Uniformity - ANSWER The uniformity of the distribution of water over a
given irrigated area. It is calculated using a catchment test. Divide the average
reading of the driest 25% of catch cans by the average reading of all the catchments,
and then multiply by 100. Closer to 100% is better.
Double Check Valve Assembly - ANSWER Backflow prevention assembly, using two
shut-off valves and to check valves assembled and pre-tested at the factory,
designed to physically block or prevent backflow.
Drip Irrigation - ANSWER The slow application of water to the specific root zone of
the plant material using very low pressure. Expressed in gallons per hour.
Dry Line Shock - ANSWER The shock which occurs when a valve is opened and the
water travels unrestricted in empty piping. This happens when the water is turned on
too fast and the air can damage the pipes.
Dynamic Water - ANSWER Water that is in motion through the system as known as
working pressure.
