AERIAL APPLICATION 2025/2026 QUESTIONS AND
ANSWERS RATED A+
✔✔A slight change in nozzle position relative to the boom can affect the pattern
uniformity, droplet size, and the percentage of material deposited in the swath. Improper
nozzle attachment or position on the boom can cause a considerable amount of spray
to be deposited on the boom and/or nozzles.
a. True
b. False - ✔✔a. True
✔✔As spray material is released directly behind the boom, the spray material can
accumulate on the boom and nozzles then dribble off causing large variations in droplet
sizes produced.
a. True
b. False - ✔✔a. True
✔✔Rotating a round boom and/or changing the method of attachment so the nozzle tip
is positioned below the boom and directed back while in level flight reduces the amount
of material released in this low pressure area therefore the amount of spray material
deposited on the boom is also reduced.
a. True
b. False - ✔✔a. True
✔✔As the size of the nozzle opening increases, the droplet size increases and the
percentage of spray volume in small droplets:
a. Increases.
b. Decreases.
c. Remains the same.
d. None of the above. - ✔✔b. Decreases
✔✔Generally a nozzle oriented at 45 degrees (back and down 45 degrees) will produce
a smaller number of droplets in the 100 micrometers or less size than a nozzle oriented
straight back at 0-degrees or as near parallel to the prevailing airflow as possible.
a. True
b. False - ✔✔False
✔✔With flat spray nozzles at a nozzle orientation of 45 degrees (back and down 45
degrees from horizontal) operated at 25 psi pressure, the volume median diameter
(vmd) of droplets ________ as air speed increases.
a. Increases
b. Decreases
c. Remains the same
d. None of the above - ✔✔Decreases
, ✔✔As the speed of an aircraft increases, the proportion of small particles in the spray
released from the aircraft is expected to:
a. Decrease
b. Increase
c. Be independent of aircraft speed
d. None of the above - ✔✔Decrease
✔✔To keep drift-sized droplets to a minimum when using nozzles with a psi of 15 to 60
psi, as you try to keep the pressure between 15 and 25 psi, add nozzles rather than
increase pressure to increase total flow.
a. True
b. False - ✔✔True
✔✔Calibration is defined as adjusting equipment to apply the desired pesticide rate over
a known area.
a. True
b. False - ✔✔True
✔✔Calibration of a liquid spray system involves (1) determining nozzle size and number
of nozzles needed to apply the desired rate and (2) determining the actual application
rate.
a. True
b. False - ✔✔True
✔✔As droplet sizes become smaller, they are more likely to drift. If the applicator needs
to increase the volume of an application it is usually best to use a nozzle with a larger
orifice size operating at a lower pressure. It is NOT important to redo the pattern test
after making this change to the spraying system.
a. True
b. False - ✔✔False
✔✔Atmospheric condition(s) that can influence pesticide drift include:
a. The mean distance from the earth to the sun.
b. Air temperature.
c. Relative humidity.
d. B and C above. - ✔✔b. Air temperature.
c. Relative humidity.
✔✔Weather in the immediate area of application and less than _______ feet from the
ground has a major effect upon pesticide applications and pesticide drift.
a. 1,000
b. 1,500
c. 2,000
d. 3,006 - ✔✔1,000
ANSWERS RATED A+
✔✔A slight change in nozzle position relative to the boom can affect the pattern
uniformity, droplet size, and the percentage of material deposited in the swath. Improper
nozzle attachment or position on the boom can cause a considerable amount of spray
to be deposited on the boom and/or nozzles.
a. True
b. False - ✔✔a. True
✔✔As spray material is released directly behind the boom, the spray material can
accumulate on the boom and nozzles then dribble off causing large variations in droplet
sizes produced.
a. True
b. False - ✔✔a. True
✔✔Rotating a round boom and/or changing the method of attachment so the nozzle tip
is positioned below the boom and directed back while in level flight reduces the amount
of material released in this low pressure area therefore the amount of spray material
deposited on the boom is also reduced.
a. True
b. False - ✔✔a. True
✔✔As the size of the nozzle opening increases, the droplet size increases and the
percentage of spray volume in small droplets:
a. Increases.
b. Decreases.
c. Remains the same.
d. None of the above. - ✔✔b. Decreases
✔✔Generally a nozzle oriented at 45 degrees (back and down 45 degrees) will produce
a smaller number of droplets in the 100 micrometers or less size than a nozzle oriented
straight back at 0-degrees or as near parallel to the prevailing airflow as possible.
a. True
b. False - ✔✔False
✔✔With flat spray nozzles at a nozzle orientation of 45 degrees (back and down 45
degrees from horizontal) operated at 25 psi pressure, the volume median diameter
(vmd) of droplets ________ as air speed increases.
a. Increases
b. Decreases
c. Remains the same
d. None of the above - ✔✔Decreases
, ✔✔As the speed of an aircraft increases, the proportion of small particles in the spray
released from the aircraft is expected to:
a. Decrease
b. Increase
c. Be independent of aircraft speed
d. None of the above - ✔✔Decrease
✔✔To keep drift-sized droplets to a minimum when using nozzles with a psi of 15 to 60
psi, as you try to keep the pressure between 15 and 25 psi, add nozzles rather than
increase pressure to increase total flow.
a. True
b. False - ✔✔True
✔✔Calibration is defined as adjusting equipment to apply the desired pesticide rate over
a known area.
a. True
b. False - ✔✔True
✔✔Calibration of a liquid spray system involves (1) determining nozzle size and number
of nozzles needed to apply the desired rate and (2) determining the actual application
rate.
a. True
b. False - ✔✔True
✔✔As droplet sizes become smaller, they are more likely to drift. If the applicator needs
to increase the volume of an application it is usually best to use a nozzle with a larger
orifice size operating at a lower pressure. It is NOT important to redo the pattern test
after making this change to the spraying system.
a. True
b. False - ✔✔False
✔✔Atmospheric condition(s) that can influence pesticide drift include:
a. The mean distance from the earth to the sun.
b. Air temperature.
c. Relative humidity.
d. B and C above. - ✔✔b. Air temperature.
c. Relative humidity.
✔✔Weather in the immediate area of application and less than _______ feet from the
ground has a major effect upon pesticide applications and pesticide drift.
a. 1,000
b. 1,500
c. 2,000
d. 3,006 - ✔✔1,000
