Why are vertical suction risers often smaller than the horizontal ...

[j.rubin]

Why are vertical suction risers often smaller than the horizontal runs on the same suction line?
 
  A) The risers are sized smaller to increase the pressure drop for improved control.
  B) The risers are sized smaller to minimize pressure drop.
  C) The risers are sized smaller to maintain a minimum velocity to lift the oil.
  D) The risers are sized smaller to minimize noise.

Question 2

In a system with multiple evaporators connected to one compressor, an evaporator pressure regulator may
  be installed on the evaporator(s) _____.
 
  a. operating at the lowest temperature and pressure
  b. located at the highest point in the system
  c. located at the lowest point in the system
  d. operating at higher temperatures and pressures

[brbarasa]

Answer to Question 1

C

Answer to Question 2

d

[j.rubin]

Thanks for the timely response, appreciate it

[jackie]

Great answer, keep it coming