300+ TOP WELDER Multiple Choice Questions and Answers

WELDER Multiple Choice Questions | welding questions and answers pdf

1. The welding method which is used to join thin metal sheets?

(A) Arc welding

(B) Gas welding

(C) Resistance welding

(D) Hydrogen welding

2. In acetylene cylinder, the acetylene is dissolved in

(A) Carbon dioxide

(B) Water

(C) Oxygen

(D) Acetone

3. Oxidizing flame is a flame which is obtained by supplying

(A) less volume of acetylene and more volume of oxygen

(B) more volume of acetylene and less volume of oxygen

(C) equal volume of acetylene and oxygen

(D) None of the above

4. Which of the following welding processes use consumable electrode?

(A) Submerged arc welding

(B) MIG welding

(C) TIG welding

(D) CIG welding

5. The heat generated in resistance welding is given by:

(A) H = I2RT

(B) H = I2R / T

(C) H = I2 / RT

(D) H = RT / I2

6. The process of joining two pieces in which a non-ferrous alloy is introduced in liquid state between the piece of metals and allowed to solidify, is known as

(A) welding

(B) brazing

(C) lancing

(D) riveting

7. In MIG welding process, the gas used for welding aluminium:

(A) Pure argon gas

(B) CO2

(C) Argon oxygen mixture

(D) Nitrogen

8. Following method melt the base metal

(A) Soldering

(B) Brazing

(C) Welding

(D) All of the above

9. Following energy source can be used for welding

(A) electron beam

(B) friction

(C) ultrasound

(D) all of the above

10. Following is the oldest type of welding

(A) forge welding

(B) arc welding

(C) resistance welding

(D) oxy-fuel welding

11. The term “weld’’ is of ___ origin.

(A) English

(B) Spanish

(C) Arabic

(D) French

12. In arc welding, the length of arc is directly related to the

(A) current

(B) voltage

(C) both (A) and (B)

(D) None of the above

13. The following welding process can use either type of direct current, as well as alternating current.

(A) Shielded metal arc welding

(B) gas metal arc welding

(C) gas tungsten arc welding

(D) all of the above

14. Following welding process(es) use consumable electrode.

(A) Shielded metal arc welding

(B) gas metal arc welding

(C) both (A) and (B)

(D) gas tungsten arc welding

15. Gas tungsten arc welding (GTAW) or tungsten inert gas (TIG welding) is used

(A) for nearly all weldable metals

(B) when quality of welds are extremely important

(C) in bicycle, aircraft and naval applications

(D) all of the above

16. Almost no smoke is produced in

(A) Shielded metal arc welding

(B) gas metal arc welding

(C) submerged arc welding

(D) gas tungsten arc welding

17. Following process is used especially for large products and in the manufacture of welded pressure vessels.

(A) Shielded metal arc welding

(B) gas metal arc welding

(C) submerged arc welding

(D) gas tungsten arc welding

18. Upset welding is a type of

(A) arc welding

(B) resistance welding

(C) gas welding

(D) none of the above

19. Ultrasonic welding is used to join

(A) thin metallic sheets

(B) metallic wires

(C) thermoplastic

(D) all of the above

20. The following is (are) the solid state welding process

(A) friction welding

(B) exothermic welding

(C) induction welding

(D) all of the above

21. Which of the following carbon steel is most weldable———–

A. 0.15 % carbon steel

B. 0.30 % carbon steel

C. 0.50 % carbon steel

D. 0.75 % carbon steel

E.1.00 % carbon steel

Answer:

A. 0.15 % carbon steel

22. The temperature of plasma tourch is of the order of———–

A. 1000 oC

B. 5000 oC

C. 10000 oC

D. 33000 oC

E.75000 oC

Answer:

D. 33000 oC

23. Arc welding in arc welding should be nearly equal to———–

A. Diameter of electrode rod (d)

B. 1.5 d

C. 2 d

D. 3 d

E.4 d

Answer:

A. Diameter of electrode rod (d)

24. Arc length in arc welding should be equal to……

A. Half the diameter of electrode rod

B. Rod diameter

C. Twice the rod diameter

D. 2.5 times the rod diameter

E.None of the above

Answer:

B. Rod diameter

25. Arc stability is better with———–

A. AC welding

B. DC welding

C. Both AC with DC welding

D. Specially designed wave forms

E.Rectified supply

Answer:

A. AC welding

26. In arc welding, if arc is too short, it will result in———–

A. Electrode sticking to the base metal and base metal not melting and bead resting on top of the work, leading to poor fusion and gas and slag holes

B. Formation of large globules in an irregular pattern because of wandering of arc, leading of poor fusion with base petal

C. Arc extinction

D. Operator hazard

E.No welding

Answer:

A. Electrode sticking to the base metal and base metal not melting and bead resting on top of the work, leading to poor fusion and gas and slag holes

27. In arc welding, if arc is too long, it will result in———–

A. Electrode sticking to the base metal and base metal not melting and bead resting on top of the work, leading to poor fusion and gas and slag holes

B. Formation of large globules in an irregular pattern because of wandering of arc, leading of poor fusion with base petal

C. Arc extinction

D. Operator hazard

E.No welding

Answer:

B. Formation of large globules in an irregular pattern because of wandering of arc, leading of poor fusion with base petal

28. Too low welding current in arc welding would result in———–

A. Excessive piling up of weld metal, poor penetration, wasted electrodes

B. Excessive spatter, under cutting along edges, irregular deposits, wasted electrodes

C. Too small bead, weak weld, and wasted electrodes

D. None of the above

Answer:

A. Excessive piling up of weld metal, poor penetration, wasted electrodes

29. Too high welding current in arc welding would result in……

A. Excessive piling up of weld metal, poor penetration, wasted electrodes

B. Excessive spatter, under cutting along edges, irregular deposits, wasted electrodes

C. Too small bead, weak weld, and wasted electrodes

D. None of the above

Answer:

B. Excessive spatter, under cutting along edges, irregular deposits, wasted electrodes

30. Too fast welding speed in arc welding would result in———–

A. Excessive piling up of weld metal, poor penetration, wasted electrodes

B. Excessive spatter, under cutting along edges, irregular deposits, wasted electrodes

C. Too small bead, weak weld, and wasted electrodes

D. None of the above

Answer:

C. Too small bead, weak weld, and wasted electrodes

31. The melting point of the filler metal in brazing should be above———–

A. 420o C

B. 820o C

C. 1020o C

D. 1200o C

E.1500o C

Answer:
A. 420 o C

32. Too slow welding speed in arc welding would result in———–

A. Excessive piling up of weld metal, poor penetration, wasted electrodes

B. Excessive spatter, under cutting along edges, irregular deposits, wasted electrodes

C. Too small bead, weak weld, and wasted electrodes

D. Excessive pillling up of weld metal, overlapping without penetration of edges, wasted electrodes

Answer:

D. Excessive pillling up of weld metal, overlapping without penetration of edges, wasted electrodes

33. In resistance welding the electrode material is made of———–

A. Carbon steel

B. Stainless steel

C. Copper

D. High speed steel

Answer:

C. Copper

34. Which type of electrode is used in submerged arc welding……

A. Bare rods

B. Coated electrodes

C. Core wires

D. Copper electrodes

Answer:

A. Bare rods

35. Seam welding is———–

A. Arc welding

B. Multi spot welding

C. Continuous welding

D. Used for forming sound bars

E.Gas welding

Answer:

C. Continuous welding

36. Flash butt welding is———–

A. Gas welding

B. Arc welding with straight polarity

C. Arc welding with reverse polarity

D. Resistance welding

Answer:

D. Resistance welding

37. The suitable welded material used in TIG welding is———–

A. Aluminium

B. Stainless steel

C. Magnesium

D. All of the above

Answer:

D. All of the above

38. The following welding process uses consumable electrodes———–

A. TIG

B. MIG

C. Thermit

D. Gas

Answer:

B. MIG

39. Preheating is essential in welding for……

A. High speed steel

B. Stainless steel

C. Cast iron

D. German silver

Answer:

C. Cast iron

40. The phenomeon of weld decay occurs in———–

A. Cast iron

B. Brass

C. Bronze

D. Stainless steel

E.Carbon steel

Answer:

D. Stainless steel

41. In resistance welding,the pressure is released ———–

A. Just at time of passing the current

B. After completion of current

C. After the weld cools

D. During heating periods

Answer:

C. After the weld cools

42. Weaving in arc welding refers to———–

A. Side to side motion of electrode at right angles to the direction of the welding

B. Side to side motion of electrode along the direction of the welding

C. Spiral motion given to electrode

D. A technique of striking the arc

Answer:

A. Side to side motion of electrode at right angles to the direction of the welding

43. The widest application of laser welding is———–

A. Heavy industry

B. Structural work

C. Process industry

D. Electronic industry

Answer:

D. Electronic industry

44. In arc welding operations the current value is decided by……

A. The thickness of plate

B. Length of welded portion

C. Voltage across the arc

D. Size of the electrode

Answer:

D. Size of the electrode

45. The mixture of iron oxide and aluminium oxide are used in thermit welding is———–

A. 1:1

B. 1:3

C. 3:1

D. Mixture of different oxide

E.None of the above

Answer:

C. 3:1

46. Weld spalter is———–

A. Flux

B. Electrode coating

C. Welding defeat

D. Welding test

Answer:

C. Welding defeat

47. Arc blow occurs in ———–

A. Gas welding

B. Gas cutting

C. Arc welding when straight polarity is used

D. Arc welding when reverse polarity is used

Answer:

C. Arc welding when straight polarity is used

48. T joint weld is useD. ……

A. When longitude share is present

B. Where severe loading is encountered and the upper surface of both pieces must be in the same plane

C. To join two pieces of metal in the same manner as revet joint metal

D. Join two pieces perpendicularly

Answer:

A. When longitude share is present

49. Voltage used in resistance welding is……

A. 1 V

B. 10 V

C. 100 V

D. 1000 V

Answer:

B. 10 V

50. In arc welding, open circuit voltage is useD. ……

A. 18-40 volts

B. 40-95 volts

C. 100-125 volts

D. 130-170 volts

E.200-240 volts

Answer:

B. 40-95 volts

51. In braze welding,the filler metal is———–

A. Distributed by capillary attraction

B. Melted and deposited at the point where the weld is to be made

C. All of the above

D. None of the above

Answer:

B. Melted and deposited at the point where the weld is to be made

52. The carburising frame as compared to oxidising flame is———–

A. More luminous

B. Less luminous

C. Equally luminous

D. Unpredictable

Answer:

A. More luminous

53. In neutral flame oxygen to acetylene ratio is———–

A. 0.8:1

B. 1:1

C. 1.2:1

D. 2:1

Answer:

B. 1:1

54. In MIG welding helium or organ is used in order to……

A. Provide cooling effect

B. Act as flux

C. Protect electrode

D. Act as shielding medium

Answer:

D. Act as shielding medium

55. Weld spatter refers to———–

A. Welding electrode

B. Flux

C. Filler material

D. Welding defect

E.Shield

Answer:

D. Welding defect

56. Neutral flame has———–

A. 1 zone

B. 2 zones

C. 3 zones

D. 4 zones

Answer:

B. 2 zones

57. Carburing flame has…….

A. 1 zone

B. 2 zones

C. 3 zones

D. 4 zones

Answer:

C. 3 zones

58. Carburising flame is used to weld metals like———–

A. Steel

B. Copper and brass

C. Curburised steel

D. aluminium, stainless steel, zinc die casting, nickel, monel etC.

Answer:

D. aluminium, stainless steel, zinc die casting, nickel, monel etc

59. Neutral flame is used to weld metals like……

A. Steel

B. Copper and brass

C. Curburised steel

D. aluminium, stainless steel, zinc die casting, nickel, monel etC.

Answer:

A. Steel

60. Oxidising flame is used to weld metals like———–

A. Steel

B. Copper and brass

C. Curburised steel

D. aluminium, stainless steel, zinc die casting, nickel, monel etC.

Answer:

B. Copper and brass

61. The following flux is used for brazing brass, copper, bronze and low carbon steels———–

A. Mixture of boric acid, borux and a wetting agent

B. Boric acid, borax or fluoride with a wetting agent

C. Chlorides and fluorides mixed with water

D. All of the above

Answer:

A. Mixture of boric acid, borux and a wetting agent

62. The following flux is used for brazing cast iron———–

A. Mixture of boric acid, borux and a wetting agent

B. Boric acid, borax or fluoride with a wetting agent

C. Chlorides and fluorides mixed with water

D. All of the above

Answer:

B. Boric acid, borax or fluoride with a wetting agent

63. Oxygen to acetyline ratio in case of oxidising flame is———–

A. 1:1

B. 1.2:1

C. 1.5:1

D. 2:1

Answer:

C. 1.5:1

64. Acetylene gas is generated form of……

A. Carbon

B. Calcium

C. Calcium carbonate

D. Calcium carbide

Answer:

D. Calcium carbide

65. Acetelyne is stored in gas cylinder in———–

A. In gaseous form

B. In liquid form

C. In solid form

D. Under high pressure

Answer:

B. In liquid form

66. Submerged 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. A process in which arc is maintained under a blanket of flux

D. All of the above

Answer:

C. A process in which arc is maintained under a blanket of flux

67. The electroslag 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. A process in which arc is maintained under a blanket of flux

D. There is nothing called electroslag

Answer:

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

68. Arc-welding uses following electric supply ———–..

A. A. C.

B. D. C.

C. Both AC and DC

D. Spiral waveform

Answer:

C. Both A. C. and D. C.

69. The most commonly used flame in gas welding is……

A. Neutral

B. Oxidising

C. Carburising

D. All of the above

Answer:

A. Neutral

70. Thermit welding———–

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. A process in which arc is maintained under blanket of flux

D. In no welding process

Answer:

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

71. 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

Answer:

D. None of the above

72. 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

Answer:

A. No-combustible electrode in combination with helium and D. C. current

73. 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

Answer:

B. Combustible electrodes and argon in combination with A. C. current

74. 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

Answer:

B. Improper clamping methods

75. 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

Answer:

A. A fine spray of metal

76. 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

Answer:

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

77. 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

Answer:

C. D. C. welding set with straight polarity

78. 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

Answer:

C. Lap

79. In arc welding, temperature of the following order may be granteD. …..

A. 1000oC

B. 1500oC

C. 5500oC

D. 8000oC

E.10000oC

Answer:

C. 5500oC

80. Forge welding is best suited for———–

A. Stainless steel

B. High carbon steel

C. Cast iron

D. Wrought iron

E.All of the above

Answer:

D. Wrought iron

81. Cross-wire welding is———–

A. Multi-spot welding process

B. Continuous spot welding process

C. Used to form mesh

D. Used where additional strength is desired

E.None of the above

Answer:

C. Used to form mesh

82. Projection welding is———–

A. Multi-spot welding process

B. Continuous spot welding process

C. Used to form mesh

D. Used to make cantilevers

Answer:

A. Multi-spot welding process

83. Seam-welding is———–..

A. Multi-spot welding process

B. Continuous spot welding process

C. Used to form mesh

D. Used for welding cylindrical objects

Answer:

B. Continuous spot welding process

84. Thermit welding is a form of……

A. Resistance welding

B. Gas welding

C. Fusion welding

D. Forge welding

E.Arc welding

Answer:

C. Fusion welding

85. TIG welding is best suited for welding———–

A. Mild welding

B. Stainless steel

C. Carbon steel

D. Silver

E.Aluminium

Answer:

E.Aluminium

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