When charging a system that uses a zeotropic refrigerant, the system should be always be charged ...

When charging a system that uses a zeotropic refrigerant, the system should be always be charged using
  _____.
 
  a. a charging cylinder
  b. liquid refrigerant from the cylinder
  c. vapor refrigerant from the cylinder
  d. subcooling values

 Q. 2

Topographic features can be found on the _____.
 
  a. elevation drawings
  b. section drawings
  c. mechanical drawings
  d. civil drawings

 Q. 3

Moisture in a system reacts with refrigerant to form _____.
 
  a. an azeotrope
  b. hydrochloric and hydrofluoric acids
  c. a non-condensable contaminant
  d. nitrogen