Compression nut, a compression sleeve, and a ferrule comprise which of the following?

Compression nut, a compression sleeve, and a ferrule comprise which of the following?
 
  A) Compression joint B) Flare joint
  C) Sweat ells D) Sweat reducing coupling

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[Ques. 2] Types of copper tubing in order of wall thickness from light to heavy are:
 
  A) M, L, and K. B) K, L, and M. C) L, M, and K. D) L, M, and L.

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[Ques. 3] HFCs are comprised of hydrogen, fluorine, and:
 
  A) Copper. B) Chromium. C) Chlorine. D) Carbon.

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[Ques. 4] Which phrase best describes the process of heating copper tubing to a temperature of 1,300F?
 
  A) Slow heating B) Bending C) Hardening D) Annealing

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[Ques. 5] The small line on a split system air-conditioning unit is the:
 
  A) Discharge line. B) Oil return line. C) Liquid line. D) Suction line.