ABE TUTORIALS

AREA 1 PROBLEM 56: SPRAYING OPERATIONS

HOW LONG WILL IT TAKE TO EMPTY THE CONTENT OF A STANDARD LEVER-OPERATED KNAPSACK SPRAYER WHEN ITS DISCHARGE IS 0.4 L/MIN? ASSUME THE SPRAYER WAS FILLED TO CAPACITY AT THE START OF SPRAYING.

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a. 50 min

b. 40 min

c. 30 min

d. 16 min

CORRECT ANSWER: B. 40 MIN

Solution:
• Standard Knapsack Sprayer Capacity = 16 Liters (standard reference in PAES/ABE exams)
• Discharge Rate (Q) = 0.4 L/min

Calculation:
Time = Capacity / Discharge Rate
Time = 16 L / 0.4 L/min
Time = 40 minutes

Note: In the absence of a stated volume, ABE problems assume the standard 16-liter capacity for manual knapsack sprayers.