In this article, we shared the electrical welding multiple choice questions (MCQ) and answers for electrical and electronics engineers.
Electrical Welding Multiple Choice Questions
The below list provides all the objective questions related to electrical welding.
Answers are available at the bottom of the article.
1. 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 porosity |
2. 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 metal |
3. In ultrasonic welding the frequency range is generally
| A) | 2000 to 3000 Hz |
| B) | 30000 to 40000 Hz |
| C) | 4000 to 20000 Hz |
| D) | 50000 to 80000 Hz |
4. 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 same |
5. Grey iron is usually welded by ____ welding
| A) | resistance |
| B) | MIG |
| C) | gas |
| D) | arc |
6. ____ welding is not a resistance welding process.
| A) | Carbon arc |
| B) | Seam |
| C) | Projection |
| D) | Flush |
7. 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 A |
8. 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 time |
9. ____ welding process uses consumable electrodes.
| A) | MIG |
| B) | All of these answers |
| C) | TIG |
| D) | Laser |
10. 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 electrode |
11. In D.C. 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 positive |
12. 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 mm |
13. Air craft body is
| A) | spot welded |
| B) | seam welded |
| C) | riveted |
| D) | gas welded |
14. Flux used in TIG welding is
| A) | none of these answers |
| B) | ammonium chloride |
| C) | ash |
| D) | borax |
15. 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 surface |
16. 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 spatter |
17. Which of the following is not an inert gas?
| A) | Argon |
| B) | All of these answers |
| C) | Carbondioxide |
| D) | Helium |
18. During resistance welding heat produced at the joint is proportional to
| A) | voltage |
| B) | I2R |
| C) | current |
| D) | kVA |
19. 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 puddle |
20. 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 heat |
21. In atomic hydrogen welding the electrode is made of
| A) | carbon |
| B) | tungsten |
| C) | mild steel |
| D) | graphite |
22. 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 rapidly |
23. Motor-generator set for D.C. arc welding has a generator of
| A) | series type |
| B) | differentially compound type |
| C) | shunt type |
| D) | level compound type |
24. During carbon arc welding if the electrode is connected to positive
| A) | arc will not strike |
| B) | carbon will have tendency to go into the weld joint |
| C) | metal will not melt |
| D) | arc will be dull |
25. The power factor of a spot welding machine is expected to be around
| A) | Unity |
| B) | 0.8 lagging |
| C) | 0.3 to 0.5 lagging |
| D) | 0.8 leading |
26. Grey iron is usually welded by
| A) | Gas welding |
| B) | Arc welding |
| C) | MIG welding |
| D) | TIG welding |
27. A SWG electrode usually operates in the current range
| A) | 20 to 30 amperes |
| B) | 50 to 65 amperes |
| C) | 300 to 400 amperes |
| D) | 95 to 135 amperes |
28. The danger of shock is maximum
| A) | during arcing |
| B) | while inserting an electrode into the holder |
| C) | after arcing |
| D) | before welding |
29. The welding load is always
| A) | continuous but varying |
| B) | none of these answers |
| C) | intermittent |
| D) | continuous and constant |
30. In argon arc welding argon is used as a
| A) | agent for heat transfer |
| B) | shield to protect the work from oxidation |
| C) | source of heat |
| D) | flux |
31. During carbon arc welding
| A) | electrode is positive with respect to the work if D.C. is used |
| B) | electrode is connected to neutral if A.C. is used |
| C) | electrode is negative with respect to the work if D.C. is used |
| D) | electrode is not connected to any voltage source when A.C. is used |
32. The welding electric circuit is
| A) | never earthed |
| B) | through cables only |
| C) | always earthed |
| D) | none of these answers |
33. A rectifier for welding has voltage/current characteristics as
| A) | drooping |
| B) | static |
| C) | rising |
| D) | variable |
34. Which of the following electrodes will have the least diameter?
| A) | 4 SWG |
| B) | 14 SWG |
| C) | 16 SWG |
| D) | 20 SWG |
35. The metal surfaces for electrical resistance welding must be
| A) | cleaned |
| B) | rough |
| C) | lubricated |
| D) | moistened |
36. The purpose of coating on arc welding electrodes is to
| A) | all of these answers |
| B) | provide slag to protect the molten metal |
| C) | provide a protective atmosphere |
| D) | stabilize the arc |
37. Spot welding is used for
| A) | costings only |
| B) | rough and irregular surfaces |
| C) | thick sections |
| D) | thin metal sheets |
38. Steel pipes are manufactured by
| A) | resistance welding |
| B) | thermit welding |
| C) | argon arc welding |
| D) | arc welding |
39. Which of the following methods is normally not preferred for welding of chromium-molybdenum steels?
| A) | Submerged arc welding |
| B) | Oxyacetylene welding |
| C) | Resistance welding |
| D) | Thermit welding |
40. For the welding of aluminum alloys which of the following methods would you recommend?
| A) | D.C. arc welding |
| B) | Tungsten arc welding |
| C) | A.C. arc welding |
| D) | Acetylene-oxygen gas welding |
41. Resistance welding cannot be used for
| A) | any of these answers |
| B) | ferrous materials |
| C) | non-ferrous metals |
| D) | dielectrics |
42. In seam welding
| A) | any of these answers |
| B) | the work piece is fixed and disc electrodes move |
| C) | none of these answers |
| D) | the work piece moves but rotating electrodes are fixed |
43. Arc blow (a welding defect) is generally encountered in
| A) | arc welding using A.C. current |
| B) | thermit welding |
| C) | gas welding |
| D) | arc welding using D.C. current |
44. Welding leads have
| A) | high current handling capacity |
| B) | high flexibility |
| C) | none of these answers |
| D) | both high flexibility and high current handling capacity |
45. TIG welding is
| A) | temperature insulated gas welding |
| B) | thermally induced gas welding |
| C) | thorium iodine gas welding |
| D) | tungsten inert gas welding |
46. Electric arc welding process produces temperature up to
| A) | 3500°C |
| B) | 5550°C |
| C) | 1500°C |
| D) | 1000°C |
47. The tips of the electrodes, for spot welding, are made of
| A) | porcelain |
| B) | copper alloy |
| C) | carbon |
| D) | mica |
48. Which of the following equipment is used for arc welding generally used for arc welding?
| A) | Transformer |
| B) | Two phase alternator |
| C) | Three phase alternator |
| D) | Single phase alternator |
49. Which of the following is not a welding accessory?
| A) | Gloves |
| B) | Electrode holder |
| C) | Cable |
| D) | Hand screen |
50. Electronic components are joined by which of the following methods?
| A) | None of these answers |
| B) | Brazing |
| C) | Spot welding |
| D) | Soldering |
| E) | Seam welding |
51. During spot welding the current flows for
| A) | few microseconds |
| B) | few milliseconds |
| C) | fraction of a second to several seconds |
| D) | fraction of a minute to several minutes |
52. Galvanising is a process of applying a layer of
| A) | zinc |
| B) | copper |
| C) | aluminium |
| D) | lead |
53. A seamless pipe has
| A) | spot welded joint |
| B) | arc welded joint |
| C) | steam welded joint |
| D) | no joint |
54. For arc welding, D.C. is produced by which of the following?
| A) | Transformer |
| B) | Regulator |
| C) | Motor-generator set |
| D) | None of these answers |
55. In a welded joint poor fusion is due to which of the following?
| A) | Improper current |
| B) | High welding speed |
| C) | Unleaned metal surface |
| D) | Lack of flux |
56. In welding weld spatter defect is generally the result of
| A) | low voltage during welding |
| B) | too high current during welding |
| C) | low current during welding |
| D) | too high voltage during welding |
57. Which of the following automatic welding processes is likely to give a maximum rate of metal deposition?
| A) | Multiple power submerged arc |
| B) | Continuous flux covered electrode |
| C) | Submerged arc (single wire) |
| D) | Gas shielded bare wire |
58. Steel rails are welded by
| A) | Resistance welding |
| B) | Argon arc welding |
| C) | Thermit welding |
| D) | Gas welding |
59. A percent duty cycle of a welding machine means
| A) | machine works on 50 percent output |
| B) | machine works for 5 minutes in a duration of 10 minutes |
| C) | machine efficiency is 50 percent |
| D) | machine input is 50 percent of rated input |
60. In which of the following methods of welding the molten metal is poured for joining the metals?
| A) | Thermit welding |
| B) | TIG welding |
| C) | Gas welding |
| D) | Arc welding |
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