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


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D.None of the above

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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


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

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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


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

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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


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B.Improper clamping methods

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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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A.A fine spray of metal

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