Why are copper fittings cleaned before soldering or brazing? ...

[casperchen82]

Why are copper fittings cleaned before soldering or brazing?
 
  A) To remove oxides
  B) To enhance the aesthetic appearance of the completed joint
  C) To create enough clearance so that the pipe will fit into the fitting
  D) To make it easier to see the junction between the fitting and the pipe

Question 2

Which type of metering device used on flooded evaporators opens to admit more liquid refrigerant into the evaporator when the liquid level in the evaporator drops?
 
  A) High-side float B) Low-side float
  C) Automatic expansion valve D) Electronic expansion valve

[apple]

Answer to Question 1

A

Answer to Question 2

B

[casperchen82]

Excellent

[Dnite]

Gracias!