What is the total system charge for a system with a factory charge of 56 oz of R-410A, an assumed ...

What is the total system charge for a system with a factory charge of 56 oz of R-410A, an assumed length of 15 ft, and a3/8 in liquid line that is 35 ft long?
 
  A) 94 oz total system charge B) 86 oz total system charge
  C) 68 oz total system charge D) 72 oz total system charge

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[Ques. 2] The formula for impedance is:
 
  A) Z = R/I. B) Z = I/E. C) Z = E/I. D) Z = I  R.

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[Ques. 3] Which of the following types of charge is usually employed when a partial charge is required?
 
  A) Negative B) Liquid C) Vapor D) Positive

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[Ques. 4] Most vapor charging is done with the compressor operating while charging is taking place; however, liquid charging:
 
  A) Is always done with the compressor on.
  B) Can be done either with the system off or operating.
  C) Is typically done on smaller systems with the system on.
  D) Is always done with the compressor off.

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[Ques. 5] Three-phase AC power is used:
 
  A) Only in residences. B) In both residential and commercial buildings.
  C) Only in commercial buildings. D) Only in Europe.