An expansion tank problem may be indicated by:

An expansion tank problem may be indicated by:
 
  A) A weeping relief valve. B) A defective mixing valve.
  C) A clogged air separator. D) A low pressure problem.

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[Ques. 2] What is the additional charge required 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) (35 - 15 )  0.6 = 12 oz B) 56 oz + 21 oz = 77 oz
  C) 56 oz + 12 oz = 68 oz D) 35  0.6 = 21 oz

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[Ques. 3] How is soot formed?
 
  A) From incomplete combustion B) From a clogged bypass plug
  C) From a suction leak D) From an excessive over-fire draft

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[Ques. 4] Technicians that use a systems approach to troubleshooting:
 
  A) Must understand the interrelationship between different system components.
  B) Replace the components that fail most often.
  C) Typically check the resistance of all the electrical components in the system.
  D) Only work on systems that they are already familiar with.

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[Ques. 5] What is the maximum water temperature for a low-pressure water boiler?
 
  A) 250F B) 150F C) 180F D) 200F