TEXAS IRRIGATION EXAM LATEST
QUESTIONS AND ANSWERS
2026 - 2027
The main factor used to determine how to size down lateral line
piping is ______.
Velocity.
If a system's head spacing is 15' then its row spacing should be
__________ for triangular spacing.
13' ft
What happen if a gear driven rotary head is installed at an angle.?
The spray patter will be distorted and it will have a poor distribution of
water.
What happens if the rotation of the rotary head is too fast?
The radius will decrease.
Changing out the size of the nozzle on a rotary head will also
change___.
__GPM of the head
__Radius of throw
An increase in the head pressure will ______.
increase flow rate.
When is a door not a door?
When it is ajar.
END OF
PAGE
1
, TEXAS IRRIGATION EXAM LATEST
QUESTIONS AND ANSWERS
2026 - 2027
As the average wind speed increases,______.
The head spacing should be increased
If you double the flow of water through of your piping, the pressure
loss will be______.
4 times greater.
Where is the precipitation rate of a spray head the greatest.?
Closest to the head.
The weight of a 1" tall column of water consist of 12 cubic inches is
______?
0.433 lbs
centrifugal Pump
most common. impeller spins water with a housing, forcing the water
through the discharge outlet by centrifugal force created by the velocity
of the water.
pump pressure output is measured in....
Feet of Head, no PSI
Total Dynamic Head (TDH)
the total of (3) variables:
1. friction loss
END OF
PAGE
2
, TEXAS IRRIGATION EXAM LATEST
QUESTIONS AND ANSWERS
2026 - 2027
2. sprinkler operating pressure
3. elevation diff.
*all should be calculated in Feet of Head (FPH)
Evapotranspiration (E.T.) or Potential Evapotranspiration
evaporation + transpiration. calculated from:
1. temperature
2.relative humidity
3. solar radiation
3. wind speed from weather stations
Precipitation Rate (Application Rate)
how much water falls on a desired area in a given time period.
measured in In./Hr.
1 acre = ? ft.
43,560 ft.
pressure compensated head
-will improve system uniformity
-heads will operate w/ same pressure regardless of inlet pressure = will
all have same GPM
END OF
PAGE
3
QUESTIONS AND ANSWERS
2026 - 2027
The main factor used to determine how to size down lateral line
piping is ______.
Velocity.
If a system's head spacing is 15' then its row spacing should be
__________ for triangular spacing.
13' ft
What happen if a gear driven rotary head is installed at an angle.?
The spray patter will be distorted and it will have a poor distribution of
water.
What happens if the rotation of the rotary head is too fast?
The radius will decrease.
Changing out the size of the nozzle on a rotary head will also
change___.
__GPM of the head
__Radius of throw
An increase in the head pressure will ______.
increase flow rate.
When is a door not a door?
When it is ajar.
END OF
PAGE
1
, TEXAS IRRIGATION EXAM LATEST
QUESTIONS AND ANSWERS
2026 - 2027
As the average wind speed increases,______.
The head spacing should be increased
If you double the flow of water through of your piping, the pressure
loss will be______.
4 times greater.
Where is the precipitation rate of a spray head the greatest.?
Closest to the head.
The weight of a 1" tall column of water consist of 12 cubic inches is
______?
0.433 lbs
centrifugal Pump
most common. impeller spins water with a housing, forcing the water
through the discharge outlet by centrifugal force created by the velocity
of the water.
pump pressure output is measured in....
Feet of Head, no PSI
Total Dynamic Head (TDH)
the total of (3) variables:
1. friction loss
END OF
PAGE
2
, TEXAS IRRIGATION EXAM LATEST
QUESTIONS AND ANSWERS
2026 - 2027
2. sprinkler operating pressure
3. elevation diff.
*all should be calculated in Feet of Head (FPH)
Evapotranspiration (E.T.) or Potential Evapotranspiration
evaporation + transpiration. calculated from:
1. temperature
2.relative humidity
3. solar radiation
3. wind speed from weather stations
Precipitation Rate (Application Rate)
how much water falls on a desired area in a given time period.
measured in In./Hr.
1 acre = ? ft.
43,560 ft.
pressure compensated head
-will improve system uniformity
-heads will operate w/ same pressure regardless of inlet pressure = will
all have same GPM
END OF
PAGE
3
