A powered extraction system is a valuable tool for _____.

A powered extraction system is a valuable tool for _____.
 
  A) removing welding fumes B) directing shielding gas
  C) feeding wire electrode D) reducing welding spatter

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[Ques. 2] The process in which heat is applied to remove strains and reduce grain size is known as _____.
 
  A) tempering B) annealing C) normalizing D) stress relieving

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[Ques. 3] The minimum requirement for twisting the hanger wires is twisting the wires in a tight spiral at least ________ times around itself.
 
  A) 2 B) 3 C) 4 D) 6

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[Ques. 4] Hanger wires for residential work are typically ________ -gauge galvanized soft steel.
 
  A) 18 B) 10 C) 16 D) 12

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[Ques. 5] The best way to save energy is ________
 
  A) To install and use wind energy sources. B) To install active solar arrays.
  C) To install passive solar arrays. D) Not to need it in the first place.