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Lost4ever Lost4ever
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6 years ago
To reduce cracking during welding of aluminum:
 
  A) Choose smaller continuous welds rather than intermittent welds
  B) Fill craters when ending weld
  C) Choose a filler metal with a very different chemistry
  D) All of the above

 Q. 2

What advantage is there to maintaining a negative pressure on the heat exchanger?
 
  A) Combustion air can only be drawn into the oil burner if a negative pressure is maintained
  B) Safety, to insure combustion products do not leak out into the air stream
  C) The vent will not work unless the heat exchanger is at a negative pressure
  D) The negative pressure helps draw in return air from the house, increasing efficiency
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RhondaUnicornRhondaUnicorn
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6 years ago
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Lost4ever Author
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#2
6 years ago
Good timing, thanks!
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