Which of the following refrigerant safety designations indicate the refrigerant is nonflammable? ...

Which of the following refrigerant safety designations indicate the refrigerant is nonflammable?

A) B1 B) A3 C) B3 D) A2

[Ques. 2] Which of the following statements is TRUE?

A) All brazing alloys containing phosphorus require flux.
B) All soldering alloys containing copper do not require flux.
C) All brazing alloys containing phosphorus do not require flux.
D) Soldering alloys have a higher flow temperature than brazing alloys.

[Ques. 3] If the refrigerant condensing saturation temperature is 100F at the start of the process, what would the entering water temperature be?

A) 80F B) 50F C) 110F D) 20F

[Ques. 4] Which of the following refrigerant safety designations indicate the refrigerant is hazardous at levels of 400 parts per million or less?

A) B1 B) A2 C) A1 D) A3

[Ques. 5] What is a potential complication that is unique to brazing?

A) Improper cleaning of the pipe can reduce bonding.
B) Heating the joint before the pipe can result in an improper fit.
C) Overheating the pipe can result in excessive oxidation.
D) Overheating the pipe can result in leakage.

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Which of the following refrigerant safety designations indicate the refrigerant is nonflammable? ...

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