Unit 5: Plant Protection Equipment - Practice Quiz

1 Which component of a sprayer stores the spray liquid?

2 What is the main function of a sprayer nozzle?

3 Which component creates pressure in a sprayer?

4 What is the purpose of a sprayer strainer?

5 In a sprayer, the liquid normally moves from the tank to the nozzle through the action of the:

6 Spraying is mainly used to apply pesticides in the form of:

7 What controls the amount of liquid delivered by a sprayer nozzle?

8 Which sprayer is commonly carried by a person on the back?

9 Which sprayer is suitable for covering several crop rows at one time?

10 A hand-operated sprayer is powered mainly by:

11 What should be done to a sprayer after use?

12 A blocked sprayer nozzle should be cleaned with:

13 Why should sprayers be stored in a clean and dry place?

14 Which component of a duster holds the pesticide dust?

15 What is the function of the outlet in a duster?

16 A duster applies pesticides mainly in the form of:

17 What helps carry dust from a duster onto the crop?

18 Which duster is operated by turning a handle by hand?

19 Which type of duster is carried on the operator's back?

20 What should be done after using a duster?

21 A sprayer is producing an uneven spray pattern because pressure fluctuates during operation. Which component is most directly responsible for stabilizing the pressure?

22 What is the main function of the strainer in a field sprayer?

23 A nozzle is delivering a narrow, concentrated stream instead of a uniform spray. Which nozzle-related factor should be checked first?

24 Why is agitation provided inside the sprayer tank when a wettable powder formulation is used?

25 A sprayer is calibrated to apply 200 L/ha while travelling at 5 km/h. If the travel speed is increased to 10 km/h without changing nozzle discharge, what will most likely happen?

26 A boom sprayer applies 300 L of spray mixture over 2 hectares. What is its application rate?

27 Which sprayer is most suitable for applying pesticides uniformly over a large cereal field with relatively low-growing crops?

28 A farmer needs to treat a few infected plants without spraying the entire field. Which sprayer type is most appropriate?

29 Which feature makes an air-blast sprayer particularly suitable for many orchard applications?

30 What should be done immediately after completing pesticide spraying to reduce corrosion and chemical damage?

31 A nozzle continues to discharge less liquid than the other nozzles after the strainer has been cleaned. What is the best maintenance action?

32 Why should a sprayer pump not be operated when the tank is empty?

33 Which component of a rotary duster is primarily used to break up and direct the dust toward the outlet?

34 A duster delivers dust in irregular bursts because material is bridging above the outlet. Which component or function should be inspected?

35 How does an air-carrier duster distribute pesticide dust over crop foliage?

36 A duster applies 12 kg of dust over 3 hectares. What is the application rate?

37 Why should the dust hopper be kept sufficiently filled during operation?

38 Which type of duster is generally appropriate for treating a small number of plants or localized areas?

39 A farmer wants to cover a large area quickly and has a tractor available. Which duster is the most suitable choice?

40 What is the most appropriate method for cleaning a duster after use?

41 A hydraulic sprayer is calibrated at a travel speed of and delivers . If ground speed increases to while pressure and nozzles remain unchanged, what is the approximate application rate?

42 In a boom sprayer, all nozzles have recently been replaced, but the nozzles at the far end of the boom consistently discharge less liquid. Which fault is most likely?

43 A piston pump sprayer shows fluctuating pressure even though the relief valve setting is unchanged. Which condition most directly causes this symptom?

44 A nozzle is rated to discharge at . Assuming an ideal orifice relationship, what pressure is required to obtain ?

45 A grower needs droplets that reduce drift while still providing acceptable foliar coverage for a contact herbicide. Which nozzle choice is most appropriate?

46 During field operation, the tank agitator is operating but the spray mixture settles rapidly when the boom is temporarily shut off. Which modification best addresses the problem?

47 A sprayer has a nominal swath width of , travels at , and applies . What total nozzle discharge is required?

48 After cleaning a sprayer used with a sulfonylurea herbicide, which practice most effectively minimizes crop injury during the next application to a sensitive crop?

49 A centrifugal pump is selected for a high-volume field sprayer. Which operating condition is most likely to cause cavitation damage?

50 A boom is fitted with nozzle spacing and operated above the target. For a flat-fan nozzle with a spray angle, why is this height generally suitable?

51 A rotary duster produces visible pulsating dust discharge although the hopper contains dry material and the blower speed is steady. Which component should be inspected first?

52 A farmer uses a rotary duster against a target located downwind. The dust cloud rises above the crop and deposits poorly on lower foliage. Which adjustment is most appropriate?

53 Which property of dust formulation most strongly increases the risk of poor metering due to bridging in a hopper?

54 A duster is calibrated to apply over an effective width of at . What mass flow rate should the metering device supply?

55 A hand-operated plunger duster delivers very little dust despite normal plunger movement. The delivery tube is clear, but the powder is compacted near the outlet from the hopper. What is the most likely corrective action?

56 Why should a duster generally be operated when wind velocity is low but sufficient to carry dust gently into the crop canopy?

57 Following storage, a power duster's blower rotates freely but produces weak air discharge at the outlet. Which fault is most likely?

58 In a blower-type duster, increasing the air stream without changing the dust metering setting can reduce effective field deposition primarily because it:

59 Which maintenance sequence is most appropriate after using a duster with a corrosive pesticide dust?

60 Two dusters use the same formulation and metering rate. Duster A has a narrow outlet with high air velocity; Duster B has a wider outlet with lower air velocity. Under calm conditions, which statement is most accurate?