Medium- or high-carbon steels are made hard and brittle by _____.

Medium- or high-carbon steels are made hard and brittle by _____.
 
  a. postheating
  b. quenching
  c. preheating
  d. fluxing

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[Ques. 2]
  The symbol in the figure above that indicates the weld must be concave in shape is _____.
 
  a. Symbol A
  b. Symbol B
  c. Symbol C
  d. Symbol D

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[Ques. 3]

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[Ques. 4] a0j5a1DFeF4easpIhAt2BZ0v9WVHQ 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 alt= />
  The symbol shown in the figure above indicates a type of weld called a _____.
 
  a. spot weld
  b. seam weld
  c. backing weld
  d. melt-through"

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[Ques. 5] No groove weld preparation size needs to be shown when the _____.
 
  a. weld size is known
  b. root opening is less than 1/8 (3.2 mm)
  c. groove weld extends all the way through the joint
  d. groove weld extends only part of the way through the joint