Welding - Welding objective questions and answers

11. Carbon arc welding is.......

   A.A process which uses a mixture of iron oxide and granular aluminium

   B.Accomplished by maintaining a hot molten metal pool between plates

   C.Used to weld carbon rods

   D.None of the above

12. In inter gas arc welding following is used for welding magnesium.......

   A.No-combustible electrode in combination with helium and d.c. current

   B.Combustible electrodes and argon in combination with a.c. current

   C.Straight polarity d.c. current

   D.Carbon dioxide, because of its excellent penetration and high speed

13. In inter gas arc welding following is used for welding alluminium.......

   A.No-combustible electrode in combination with helium and d.c. current

   B.Combustible electrodes and argon in combination with a.c. current

   C.Straight polarity d.c. current

   D.Carbon dioxide, because of its excellent penetration and high speed

14. Distortion in welding occures due to......

   A.Use of excessive current

   B.Improper clamping methods

   C.Use of wrong electrodes

   D.Oxidation of weld pool

   E.Improper composition of parent material

15. In MIG welding, the metal is transferred in the form of.......

   A.A fine spray of metal

   B.Molten drops

   C.Weld pool

   D.Molecules

   E.Very fine metal

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