Question

What is the formula used for calculating VMD, when pressure is less than 675 kPa?

(a) \(\frac{(VMD1)}{VMD2}=\Big\{(\frac{P1}{P2})^{\frac{2}{3}} \Big\} \)

(b) \(\frac{(VMD1)}{VMD2}=\Big\{(\frac{P2}{P1})^{\frac{2}{3}} \Big\} \)

(c) \(\frac{(VMD2)}{VMD1}=\Big\{(\frac{P1}{P2})^{\frac{2}{3}} \Big\} \)

(d) \(\frac{(VMD2)}{VMD1}=\Big\{(\frac{P1}{P2})^{\frac{1}{3}} \Big\} \)

I had been asked this question during an interview.

The origin of the question is Plant Protection Equipments topic in portion Plant Protection Equipments of Farm Machinery

Answer 1

The correct option is (b) \(\frac{(VMD1)}{VMD2}=\Big\{(\frac{P2}{P1})^{\frac{2}{3}} \Big\} \)

The best explanation: The droplets size that device the spray into two equal parts by volume. One half containing smaller than this diameter and other half of the volume containing larger droplets. In other words, VMD divides the droplet in two portion such that the total volume of all droplets smaller the VMD is equal to the total volume of all droplets larger than VMD.