What is the legal authority governing: "To double the output (Gallons Per Minute - GPM) of a hydraul..."?

This standard is governed by 40 CFR § 171.103(d) under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and 40 CFR Part 171.

What is the passing score for the EPA Pesticide Applicator exam?

The minimum passing score for the National Core Pesticide Applicator Certification exam is 70% (40 CFR § 171.103).

Spray Equipment And Calibration MEDIUM 40 CFR § 171.103(d)

To double the output (Gallons Per Minute - GPM) of a hydraulic spray nozzle solely by adjusting operating system pressure, by what factor must the pressure (PSI) be increased?

Multiple Choice Options

A 2 times (pressure must double).

B 4 times (pressure must quadruple). ✓ OFFICIAL VERIFIED CORRECT ANSWER

C 8 times.

D 1.41 times.

40 CFR § 171.103(d)

Official Manual Chapter: Chapter 9: Application Equipment & Chapter 10: Calibration

Nozzle flow rate varies in proportion to the square root of pressure: (GPM1 / GPM2) = sqrt(PSI1 / PSI2). Therefore, to double output (2x GPM), pressure must be increased by 2 squared = 4 times. Adjusting pressure to make large changes in output is undesirable because high pressure creates dangerously small, drift-prone droplets.

Official EPA Core Study Domain Spray Equipment And Calibration

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To double the output (Gallons Per Minute - GPM) of a hydraulic spray nozzle solely by adjusting operating system pressure, by what factor must the pressure (PSI) be increased?

Multiple Choice Options

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