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#Helium electric arc generator#
arc welding has a generator of A) series type B) differentially compound type C) shunt type D) level compound typeĢ4. Due to which of the following reasons aluminum is difficult to weld? A) It has an oxide coating B) None of these answers C) Both It has an oxide coating and It conducts away heat very rapidly D) It conducts away heat very rapidlyĢ3. In atomic hydrogen welding the electrode is made of A) carbon B) tungsten C) mild steel D) graphiteĢ2. The welding of aluminium alloy entails which of the following problems? A) All of these answers B) On melting becomes thin liquid- tendency to run off C) Low specific resistance requiring heavy current D) High thermal conductivity quick dissipates heatĢ1. Arc blow results in which of the following? A) All of these answers B) Shallow weld puddle giving rise to weak weld C) Non-uniform weld beads D) Splashing out of metal from the weld puddleĢ0. During resistance welding heat produced at the joint is proportional to A) voltage B) I 2R C) current D) kVAġ9. Which of the following is not an inert gas? A) Argon B) All of these answers C) Carbondioxide D) Heliumġ8. In arc welding major personal hazards are A) harmful infrared and ultra-violet rays from the arc B) flying sparks C) all of these answers D) weld spatterġ7. In electrical resistance welding the greatest resistance is offered by which of the following? A) Contact layer of meta ls to be welded B) Contact point of electrode with metal top C) Contact point of electrode with metal bottom D) Metal surfaceġ6. Flux used in TIG welding is A) none of these answers B) ammonium chloride C) ash D) boraxġ5.
Air craft body is A) spot welded B) seam welded C) riveted D) gas weldedġ4. Plain and butt welds may be used on materials up to the thickness of nearly A) 10 nm B) 50 mm C) 25 mm D) 5 mmġ3. arc welding A) both electrode as well as workpiece are made negative B) both electrode as well as workpiece are made positive C) electrode is made positive and work- piece negative D) electrode is made negative and workpiece positiveġ2. The porosity of welded joint may be caused by A) any of these answers B) low welding current C) poor base metal D) incorrect size of the electrodeġ1. A) MIG B) All of these answers C) TIG D) Laserġ0. _ welding process uses consumable electrodes. In spot welding composition and thickness of the base metal decides A) the amount of weld current B) the amount of squeeze pressure C) all of these answers D) hold timeĩ. For arc welding current range is usually A) 10 to 15A B) 50 to 100 A C) 100 to 350 A D) 30 to 40 AĨ. A) Carbon arc B) Seam C) Projection D) Flushħ.
_ welding is not a resistance welding process. Grey iron is usually welded by _ welding A) resistance B) MIG C) gas D) arcĦ. During arc welding as the thickness of the metal to be welded increases A) current should increase, voltage should decrease B) current should increase, voltage remaining the same C) current should decrease, voltage should increase D) voltage should increase, current- remaining the sameĥ. Helium produces which of the following? A) All of these answers B) Deeper penetration C) Narrower heat affected zone in base metal D) Faster welding speeds Narrower heat affected zone in base metalģ. Increased heat due to shorter arc is harmful on account of A) under-cutting of base material B) burn through C) all of these answers D) excessive porosityĢ.
The below list provides all the objective questions related to electrical welding.Īnswers are available at the bottom of the article.ġ. Electrical Welding Multiple Choice Questions In this article, we shared the electrical welding multiple choice questions (MCQ) and answers for electrical and electronics engineers.
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