Module 9: Sprayers

Question 1

application of chemicals to control weeds, pests and diseases

Answer 1

chemical control

Question 2

most common method of controlling various pests and diseases in crop prod sys

Answer 2

chemical control

Question 3

chemicals that are usually applied mechanical sprayers

Answer 3

• herbicides
• insecticides
• fungicides
• plant nutrients

Question 4

basic functions of sprayer

Answer 4

• break the liquid into droplets of effective size
• distrib the spray solution uniformly
• regulate the spraying rate

BDR

Question 5

basic components of sprayer

Answer 5

1. chem supply : tank
2. energy sources : pump and pressure chamber
3. atomizer : nozzles
4. control device : cut-off valve
5. conductors : flexible hose and rigid lance

Question 6

hand operated sprayers

Answer 6

• compression sprayer
• knapsack sprayer

Question 7

power operated sprayers

Answer 7

• power knapsack
• portable power
• ultra low volume
• agri robot power
• self propelled
• boom
• tractor mounted
• tractor trailer type

Question 8

most popular way of applying chemicals is thru the use of what?

Answer 8

knapsack sprayer

Question 9

pipe or tube of varying cross-sectional area and used to direct or modify the flow of fluids

Answer 9

sprayer nozzle

Question 10

used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from it

Answer 10

sprayer nozzle

Question 11

main part of a sprayer that atomizes the liquid to fine particles by the application of high pressure

Answer 11

sprayer nozzle

Question 12

2 classification of nozzle according to the number of nozzle HOLE

Answer 12

1. single hole nozzle - one hole on a nozzle tip on top of a spray rod
2. multi-hole nozzle - two or more holes on a nozzle tip on top of a spray rod

Question 13

2 classification of nozzle according to the number of nozzle HEAD

Answer 13

1. single head nozzle
2. multi-head nozzle

Question 14

3 classification of nozzle according to the nozzle SHAPE

Answer 14

1. tip
2. disc
3. cap

Question 15

2 classification of nozzle according to the spray pattern

Answer 15

1. cone type
2. fan type

Question 16

2 classification of nozzle according to the spray pattern

best suited for spraying crops because it produces a spray in which droplets approach the leaves from several angles

Answer 16

cone type

Question 17

2 classification of nozzle according to the spray pattern

operates in high pressure and requires small orifice opening

Answer 17

cone type

Question 18

2 classification of nozzle according to the spray pattern

best suited for spraying flat surfaces as in the application of herbicides

Answer 18

fan type

Question 19

2 classification of nozzle according to the spray pattern

low pressure and requires large orifice opening

Answer 19

fan type

Question 20

the sprayer nozzle performance is dependent on?

Answer 20

hydraulic energy

Question 21

the higher the pressure, the ________ the droplets

Answer 21

smaller

Question 22

the higher the pressure, the _______ the flow rate

Answer 22

higher

Question 23

the higher the pressure, the wider the spray angle

true or false

Answer 23

true

Question 24

principle of creating hydraulic energy

Answer 24

pressure is created by adding air to a container with a fixed volume of liquid

air <——> liquid

Question 25

pressure is created by adding air to a container with a fixed volume of liquid this principle is observed in??

Answer 25

compression sprayer

Question 26

pressure is created by adding liquid to a container with a fixed volume of air

Answer 26

knapsack sprayer

Question 27

sprayer calibration for a given sprayer, the following factors should be determined

Answer 27

1. nozzle discharge at different pumping rates (L/min) 2. effective working width or swath (m) 3. walking speed (m/min) 4. application rate (L/ha)

Question 28

low-cost, hand-held device for chemical application designed for controlled droplet application and electrostatic charging of spray liquid

Answer 28

electrostatic ultra-low volume-controlled droplet application (ULV-CDA)