What are the main disadvantages of a centrifugal pump in a power ...

[Awilson837]

What are the main disadvantages of a centrifugal pump in a power sprayer as compared to a roller pump?
 
  What will be an ideal response?

Question 2

Some soil colloids exhibit positive charges under highly acid conditions. To what are these charges likely due?
 
  A) the release of some OH- ions leaving an unsatisfied positive charge on the colloid
  B) the adsorption of Al3+ ions on the colloid
  C) protonation of some hydroxy groups by excess H+ ions
  D) increase in the level of H+ ions on the exchange complex
  E) substitution of lower valent atoms for higher valent atoms in the octahedral sheet

[bitingbit]

Answer to Question 1

Low pressure, not self-priming, and a speedup drive or a high-speed hydraulic motor is required.

Answer to Question 2

C