Question Bank • QB_EXP_FM_PP_003 MSQ • 2 Marks

Section 2: Farm Machinery

Spray Nozzles, Droplets & Application Rates

Subtopic: Volume Median Diameter (VMD) and Number Median Diameter (NMD)

Question Statement:

Regarding spray droplet size distribution and nozzle aerodynamics, which of the following statements is/are CORRECT?

Options:

  • (A) Volume Median Diameter (VMD or D_v0.5) is the droplet diameter such that 50% of the total spray volume consists of smaller droplets
  • (B) Droplets smaller than $100\,\mu\text{m}$ are highly susceptible to airborne drift
  • (C) The relative span factor of spray droplets is defined as $(D_{v0.9} - D_{v0.1}) / D_{v0.5}$
  • (D) Increasing nozzle operating pressure decreases the average droplet size and increases drift potential

Answer Key:

A, B, C, D

Step-by-Step Solution & Explanation

1. By definition, VMD divides spray volume into two equal 50% halves. (A is correct) 2. Droplets
lt; 100\,\mu\text{m}$ remain suspended easily and drift off-target. (B is correct) 3. Relative Span factor $\text{RS} = (D_{0.9} - D_{0.1})/D_{0.5}$ measures droplet size uniformity. (C is correct) 4. Higher hydraulic pressure increases atomization shear, producing finer droplets and greater drift. (D is correct) All choices A, B, C, D are correct.
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