In plasma arc cutting, plasma is created by _____.

In plasma arc cutting, plasma is created by _____.
 
  a. combining acetylene with acetone
  b. exposing cutting gas to radioactive material
  c. passing fuel gases through a large orifice inside the torch
  d. superheating gas in an electric arc

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[Ques. 2] The most common use of insulating concrete forms is in _____.
 
  a. low commercial structures
  b. multistory industrial buildings
  c. high-rise office buildings
  d. apartment complexes

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[Ques. 3] If properly constructed, firewalls between apartment or townhouse units can provide protection against
  flame spread for up to _____.
 
  a. 30 minutes
  b. 1 hour
  c. 2 hours
  d. 4 ho

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[Ques. 4] A masonry veneer wall must be separated from its backup by an airspace of at least _____.
 
  a. 1/2 inch
  b. 1 inch
  c. 1-1/2 inches
  d. 2 inches

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[Ques. 5] The stick-system type of curtain wall is commonly used on buildings of less than _____.
 
  a. 15 stories
  b. 12 stories
  c. 5 stories
  d. 3 stories