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aerial application of pesticides > Pesticides > Flashcards

Pesticides Flashcards

1
Q

Most spray drifts consist of droplets having.

A

Diameters less than 200 microns

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2
Q

The fall rate of a spray droplet is roughly to the (_________) of the droplets diameter.

A

Square

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3
Q

In general, as air temperature increases the potential for spray drift also

A

Increases

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4
Q

For any given set of Nozzles, increasing pump pressure will;

A

Increase spray drift potential

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5
Q

Assuming all other spray systems variables, pump pressures, spray mix velocity are kept constant, the nozzle tip orifice diameter increases, the percentages of spray volume composed of small droplets

A

decrease

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6
Q

A good ag pilot should be prepared to refuse for spray service at a particular time if he thinks it is a safety hazard, etc

A

True

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7
Q

Spray drift only occurs ________ of the spray application

A

downwind

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8
Q

One of the most resent navigation tools today is GPS. GPS stand for

A

Global positioning system

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9
Q

Spray droplet size decreases as aircraft travel speed increases because

A

air shear action on spray droplets causes them to break up, making smaller droplets

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10
Q

Who is responsible for ensuring the notification provision of the Workers Protection Standard?

A

The on-site field crew members

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11
Q

In general, solid stream nozzles tend to generate

A

relatively coarse sprays, as do low-drift nozzles

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12
Q

In order to double the spray out-put from a nozzle, pump pressure must be approzimately

A

Quadrupled (4x increase)

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13
Q

Increasing the Ram-Air Spreader hopper feed rate will typically cause;

A

a decreased in swath width

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14
Q

Microweather which ground level or within plant canopy weather conditions at or near the target site,

A

Affects all outdoor pesticide applications

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15
Q

Unsatisfactory single-pass distribution patterns result from most ram-air devices if the target site application rate is either

A

Less than 50lbs. per acre
More than 250 lbs. per acre
Targeted ejection rate is more than 35 lbs. per second

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16
Q

When ferrying to and from an application site it is recommended that the aircraft maintain a minimum altitude of

A

500 feet

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17
Q

A boom discharge rate is typically expressed in

A

gallons per minute (gpm)

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18
Q

a nozzle that generates spray droplets by causing the spray mix liquid to be flung outward from the center and passes through a rotating screen is called

A

rotary atomizers

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19
Q

Resent findings of aerial drift research indicate that output from pattern nozzles are likely to;

A

emit drift-prone spray droplets unless the cone pattern tips have been configured to produce coarse spray droplets

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20
Q

pesticides formulated as a dust are

A

particularly prone to off target movement

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21
Q

Differential GPS utilizes

A

two GPS receivers

22
Q

To obtain a current copy of revisions of 14 CFR 137 that effect the application one should contact

A

Superintendent of Documents U.S. Government Printing Office
Washington, D.C. 20402

23
Q

According to 137, each aircraft in service must contain

A

a facsimile copy of the agricultural aircraft operation certificate

24
Q

Of the main shapes of spray boom, which is unlikely to cause turbulence and is preferred cross-section shape of an aerial spray boom?

A

Airfoil (wing-shaped)

25
Q

Application height is the distance between the nozzle tip and the target site

A

Which is 8 - 10 feet

26
Q

Atmospheric stability has an impact on drift potential,

A

stable air promotes spray drift

27
Q

Inlet vane repositioning is typically used to make;

A

major adjustments toward ram-air spreader swath uniformity

28
Q

Unless a spray plane is being set up exclusively for low volume work, hydraulic system pupming should generally have tubing diameter greater than 1 inch

A

they should have approximately 2 inch tubing

29
Q

Unless this will determine the swath width is to

A

do a pattern test

30
Q

The single most important factor effecting spray drift is;

A

Spray droplet size

31
Q

A surface active agent surfactant reduces the spray droplets dynamic surface tension, adding surfactant to a batch of spray turns out to be a good way to;

A

increase drift potential

32
Q

Under 137 an agriculture aircraft operator certificate remains valid and effective for;

A

until it is surrendered, suspended, or revoled

33
Q

The spray droplet spectrum of any nozzle tip is least altered by air shear when it’s nozzle mounting angle;

A

corresponds to airflow direction

34
Q

The basic equipment required for DGPS during aerial application;

A

1) GPS mobile receiver
2) GPS antenna
3) lightbar
4) CPU

35
Q

Whenever both state and federal law supply specific provision governs aerial application

A

state law governs the issue

36
Q

These are 3 variables that influence that boom discharge rate

A

Nozzle tip size
Total number of working nozzles on the boom
At-nozzles spray pressure (pump-pressure)

37
Q

Needle-and-seat check valves tend to be less labor intensive to clear the clogs that diaphragm check valves these are examples of;

A

Nozzle Anti-Drip Devices

38
Q

The most energy efficient flight pattern

A

the racetrack pattern

39
Q

What influences application uniformity for very low application rates of dry products;

A

even flow through the metering gate

40
Q

Two variables that influence the treated area progress rate (apm);

A

swath width, speed of the aircraft as it passes over the target site

41
Q

For rotor aorcraft, boom length should be

A

80% of rotor span

42
Q

In almost every case boom length should not exceed;

A

75%

43
Q

WAAS was recently developed by the

A

Federal Aviation Agency (FAA)

44
Q

In general, the capacity of delivering comparably high boom outputs while working against a relativity low spray pressure makes the ___________ well suited for many aerial application equipment configuration

A

centrifugal pump

45
Q

Propwash displacement in fised wing aircraft is caused by propeller rotation producing a spiral slipstream about the fuselage, how does this effect the spray pattern;

A

moves particles from the right to the left

46
Q

Hydraulic piping and fittings should have a diameter of ________ for hugh volume

A

3 inches

47
Q

A typical onboard DGPS computer enable aerial guidance, waypoints, mapping, therefore

A

Flaggers are eliminated

48
Q

Pesticides moving offsite after contacting hot surfaces like bare soil and then evaporates with water is called

A

co-distillation

49
Q

For complete information on the process to follow to obtain a FAA pilot certificate for agriculture operations, refer to FAA advisory circular 137-1.A. You may obtain this form from the local

A

FSDO

50
Q

The best possible mounting configuration of a ram-air spreader is the one that causes the least turbulence. Having the smoothest airflow into, around, and out of the spreader performance and provides good application results.

A

True

aerial application of pesticides (1 decks)

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