Electric Welding MCQ PDF

81. The danger of electric shock is maximum

(a) before welding.
(b) during arcing.
(c) while inserting electrode into the holder.
(d) after welding.

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82. The eyes of welding operator must be protected against

(a) infrared radiations.
(b) ultraviolet radiations.
(c) both (a) and (b).
(d) solar radiations.

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83. Which of the following automatic welding processes is likely to give maximum rate of metal deposition ?

(a) Multiple power submerged arc.
(b) Gas shielded bare wire.
(c) Single wire submerged arc.
(d) Continuous flux covered electrode.

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85. In a welded joint poor fusion is on account of

(a) improper current.
(b) high welding speed.
(c) uncleaned metal surface.
(d) lack of flux.

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86. Which of the following uses consumable electrodes?

(a) TIG.
(b) MIG.
(c) laser.
(d) None of the above.

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87. In which of the following welding methods the molten metal is poured for joining the metals?

(a) Gas welding.
(b) Thermit welding.
(c) TIG welding.
(d) Arc welding.

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88. The porosity of weld joint may be caused by

(a) poor base metal.
(b) incorrect size of electrode.
(c) low welding current.
(d) any of the above.

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89. In welding, weld spatter defect is generally because of too……..during welding.

(a) high voltage
(b) high current
(c) low voltage
(d) low current

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90. High temperature metals, such as columbium can be easily welded by

(a) MIG welding.
(b) TIG welding.
(c) electron beam welding.
(d) flash butt welding.

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91. ………welding is used for welding of car body.

(a) Gas
(b) Spot
(c) Carbon-arc
(d) Atomic hydrogen

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92. Grey iron is usually welded by

(a) gas welding.
(b) resistance welding.
(c) TIG welding.
(d) arc welding.

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93. The method recommended for the welding of aluminum alloy is…………welding.

(a) dc arc
(b) ac arc
(c) acetylene-oxygen gas
(d) tungsten arc

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94. Steel pipes are manufactured by

(a) arc welding.
(b) argon arc welding.
(c) resistance welding.
(d) thermit welding.

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95. Steel rails are welded by

(a) thermit welding.
(c) gas welding.
(b) argon arc welding.
(d) resistance welding.

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96. Aluminum is difficult to weld as

(a) it has an oxide coating.
(b) it conducts away heat very rapidly.
(c) both (a) and (b).
(d) none of the above.

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97. Electronic components are joined by

(a) spot welding.
(b) soldering.
(c) brazing.
(d) none of the above.

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98. Aircraft body is

(a) riveted.
(b) seam welded.
(c) gas welded.
(d) spot welded.

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99. A seamless pipe has

(a) arc welded joint.
(b) spot welded joint.
(c) no joint.
(d) either (a) or (b).

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100. The method usually not preferred for welding of chromium molybdenum steel is

(a) thermit welding.
(b) resistance welding.
(c) submerged arc welding.
(d) oxyacetelyne gas welding.

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Electric Welding MCQ PDF

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