Welding - Welding objective questions and answers

16. In reverse polarity welding.......

   A.Electrode holder is connected to the negative and work to positive

   B.Electrode holder is connected to the positive and work to negative

   C.Work is positive and holder is earthed

   D.Holder is positive and work is earthed

   E.Work is negative and holder is earthed

17. Equipment is used for arc welding a material by carbon electrode.......

   A.A.C. welding set

   B.Rectifier

   C.Motor generator

   D.D.C. welding set with straight polarity

   E.D.C. welding set with reverse polarity

18. Which of the following is strongest for brazing joints.......

   A.Butt

   B.Scarf (inclined)

   C.Lap

   D.All are equally strong

   E.Strength depends on other factors

19. In arc welding, temperature of the following order may be granted......

   A.1000^oC

   B.1500^oC

   C.5500^oC

   D.8000^oC

   E.10000^oC

20. Forge welding is best suited for.......

   A.Stainless steel

   B.High carbon steel

   C.Cast iron

   D.Wrought iron

   E.All of the above

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