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Mrpkerzz Mrpkerzz
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6 years ago
How is a concentric vent used in a high-efficiency furnace?
 
  A) It creates two close exit points for the vent pipe and combustion air pipe.
  B) It allows the vent pipe to combine with condensate drainage.
  C) It directs the combustion air pipe to an outdoor exit.
  D) It allows a single outdoor exit point for the vent and combustion air pipe.

 Q. 2

FCAW equipment is the same as GMAW.
 
  Indicate whether the statement is true or false

 Q. 3

All mechanical seals have a set of _____, one that rotates and one that is stationary.
 
  a. springs
  b. cartridges
  c. primary faces
  d. O-rings
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NpeteteNpetete
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6 years ago
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6 years ago
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