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Mechanical Engineering Objective Questions { Production Technology }



71. In arc welding, if arc is too short, it will result in
A.Formation of large globules in an irregular pattern because Of wandering of arc, leading to poor fusion with base metal
B.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
C.Arc extinction
D.Operator hazard

72. 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.Excessive piling up of weld metal,edges, wasted electrodes, overlapping without penetration of

73. Of the following brazing joints, which is strongest
A.Butt
B.Scarf (inclined)
C.Lap
D.All are equally strong

74. 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.Both of the above
D.Not required

75. The melting point of the filler metal in lirazing should be above
A.420C
B.600C
C.800C
D.900C

76. 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 tatting along edges, irregular deposits, wasted electrodes
C.Too small bead, weak weld and wasted electrodes
D.Excessive piling up of weld metal, overlapping without penetration of edges, wasted electrodes

77. Arc length in arc welding should be nearly equal to
A.Diameter of electrode rod (d)
B.1.5d
C.2d
D.3d

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