ILLINOIS AERIAL APPLICATION MAIN EXAMS EOC
QUESTIONS AND ANSWERS FIRM A+
✔✔If spray does strike structural parts of the aircraft, what four things will likely happen?
- ✔✔spray collects and falls off in large drops
distort the spray pattern
waste material
corrode aircraft surfaces
✔✔What should be installed to prevent the problem that trapped pressurized air in the
space between the boom ends and the outermost nozzles causes when the spray
continues to flow even after you close the spray valve? - ✔✔install air bleed lines to
each end of the boom
✔✔Nozzles provide the primary means of controlling three factors that affect any
application and possible off-target movement of the pesticide: - ✔✔the application
volume
droplet size
spray pattern
✔✔Aerial applications volumes fall into what three categories? - ✔✔conventional (5 to
15 or more gallons per acre)
low volume (0.5 to 5 gallons per acre)
ultra low volume (less than 0.5 gallons per acre)
✔✔What is the problem with cone pattern nozzles? - ✔✔the spray output is likely to
emit drift-prone droplets unless configured to produce coarser droplets
✔✔What type of nozzles produce the largest droplets and the lowest drift compared to
other nozzle types? - ✔✔straight stream nozzles oriented straight back
✔✔Spray drift studies indicate that nozzles that emit ___________ spray patterns
typically produce fewer small, drift-prone spray droplets than do cone-pattern nozzles. -
✔✔fan-shaped
✔✔Flat fan patterns have the highest deposition in the _____ of the pattern and
deposition _____ ___ towards the edges. - ✔✔center
tapers off
✔✔Even flat fan nozzle patterns are ______ across the whole width of the nozzle
pattern. - ✔✔uniform
✔✔In general, fan nozzle tips that produce wide angles generate ____ drift-prone spray
droplets. - ✔✔more
, ✔✔Fan nozzle tips designed to emit no more than an ____ degree spray pattern are
better suited for aerial spray applications. - ✔✔80
✔✔With variable flow rate nozzles, the nozzle orifice size is _____ and enlarges or gets
smaller as the system pressure increases or decreases. - ✔✔flexible
✔✔What are three advantages of variable flow rate nozzles? - ✔✔1. the ability to
change application volume on the fly by increasing or decreasing system pressure
instead of replacing nozzle orifices
2. Better spray droplet uniformity that is less affected by system pressure changes
3. A more uniform application volume and spray pattern even when application airspeed
varies
✔✔Nozzle that disperses liquid in a flood type wide-angle flat fan pattern or a straight
stream. - ✔✔variable orifice flood nozzles
✔✔Consists of a screen mesh cylinder that rotates around the nozzle orifice. The higher
speed of fixed-wing aircraft favors the use of these. - ✔✔rotary atomizers
✔✔Because rotary atomizers have relatively large metering orifices, their nozzles do not
___ as easily as conventional nozzles when applying low-volume sprays containing a
high concentration of chemicals in suspension. - ✔✔clog
✔✔What are the two types of hollow-cone pattern nozzles? - ✔✔disc-core type
whirl-chamber type
✔✔Using the ____ ____ in a rotary-wing aircraft to start and stop the spray and leaving
the pump running allows the suck-back feature to work properly and provides hydraulic
agitation for the spray tank. - ✔✔boom valve
✔✔As with other navigational devices, an ____________ aircraft maintenance
technician must install, test, and repair DGPS equipment and components. - ✔✔FAA-
certified
✔✔A basic DGPS component includes what four things? - ✔✔DGPS mobile receiver
GPS antenna
Light bar
Computer processor (CPU)
✔✔A linear array of light emitting diodes (LEDs) that produce a visual representation of
the position of the aircraft in relation to the swath you are spraying. - ✔✔GPS light bar
QUESTIONS AND ANSWERS FIRM A+
✔✔If spray does strike structural parts of the aircraft, what four things will likely happen?
- ✔✔spray collects and falls off in large drops
distort the spray pattern
waste material
corrode aircraft surfaces
✔✔What should be installed to prevent the problem that trapped pressurized air in the
space between the boom ends and the outermost nozzles causes when the spray
continues to flow even after you close the spray valve? - ✔✔install air bleed lines to
each end of the boom
✔✔Nozzles provide the primary means of controlling three factors that affect any
application and possible off-target movement of the pesticide: - ✔✔the application
volume
droplet size
spray pattern
✔✔Aerial applications volumes fall into what three categories? - ✔✔conventional (5 to
15 or more gallons per acre)
low volume (0.5 to 5 gallons per acre)
ultra low volume (less than 0.5 gallons per acre)
✔✔What is the problem with cone pattern nozzles? - ✔✔the spray output is likely to
emit drift-prone droplets unless configured to produce coarser droplets
✔✔What type of nozzles produce the largest droplets and the lowest drift compared to
other nozzle types? - ✔✔straight stream nozzles oriented straight back
✔✔Spray drift studies indicate that nozzles that emit ___________ spray patterns
typically produce fewer small, drift-prone spray droplets than do cone-pattern nozzles. -
✔✔fan-shaped
✔✔Flat fan patterns have the highest deposition in the _____ of the pattern and
deposition _____ ___ towards the edges. - ✔✔center
tapers off
✔✔Even flat fan nozzle patterns are ______ across the whole width of the nozzle
pattern. - ✔✔uniform
✔✔In general, fan nozzle tips that produce wide angles generate ____ drift-prone spray
droplets. - ✔✔more
, ✔✔Fan nozzle tips designed to emit no more than an ____ degree spray pattern are
better suited for aerial spray applications. - ✔✔80
✔✔With variable flow rate nozzles, the nozzle orifice size is _____ and enlarges or gets
smaller as the system pressure increases or decreases. - ✔✔flexible
✔✔What are three advantages of variable flow rate nozzles? - ✔✔1. the ability to
change application volume on the fly by increasing or decreasing system pressure
instead of replacing nozzle orifices
2. Better spray droplet uniformity that is less affected by system pressure changes
3. A more uniform application volume and spray pattern even when application airspeed
varies
✔✔Nozzle that disperses liquid in a flood type wide-angle flat fan pattern or a straight
stream. - ✔✔variable orifice flood nozzles
✔✔Consists of a screen mesh cylinder that rotates around the nozzle orifice. The higher
speed of fixed-wing aircraft favors the use of these. - ✔✔rotary atomizers
✔✔Because rotary atomizers have relatively large metering orifices, their nozzles do not
___ as easily as conventional nozzles when applying low-volume sprays containing a
high concentration of chemicals in suspension. - ✔✔clog
✔✔What are the two types of hollow-cone pattern nozzles? - ✔✔disc-core type
whirl-chamber type
✔✔Using the ____ ____ in a rotary-wing aircraft to start and stop the spray and leaving
the pump running allows the suck-back feature to work properly and provides hydraulic
agitation for the spray tank. - ✔✔boom valve
✔✔As with other navigational devices, an ____________ aircraft maintenance
technician must install, test, and repair DGPS equipment and components. - ✔✔FAA-
certified
✔✔A basic DGPS component includes what four things? - ✔✔DGPS mobile receiver
GPS antenna
Light bar
Computer processor (CPU)
✔✔A linear array of light emitting diodes (LEDs) that produce a visual representation of
the position of the aircraft in relation to the swath you are spraying. - ✔✔GPS light bar
