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emmybay02 emmybay02
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6 years ago
Which statement is correct regarding the cleaning of base metals before welding?
 
  a. All metals should be cleaned before welding.
  b. It is not necessary to clean new metal.
  c. Metals only need to be cleaned if they show signs of corrosion.
  d. Metals only need to be cleaned if they are painted or coated.

 Q. 2

What is the maximum safe amount of refrigerant for a recovery cylinder with a water capacity of 50 pounds, holding a refrigerant with a specific gravity of 0. 9?
 
  A) 50 lbs  0. 8 = 40 lbs B) 50 pounds
  C) 50 lbs  0. 8  0. 9 = 36 pounds D) 50 lbs  0. 9 = 45 lbs
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slayer909slayer909
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6 years ago
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emmybay02 Author
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#2
6 years ago
Thank you for always stepping in by helping me with my homework
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