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Mechanical Engineering Objective Questions { Production Technology }



85. The temperature produced in oxyhydrogen flame as compared to oxy-acetylene flame is
A.Same
B.More
C.Less
D.Unpredictable

86. The amount of current necessary in resistance welding is of the order of
A.1-2 kVAJcm2
B.2.5-4.0 kVA/cm2
C.4.5-6.2 kVA/cm2
D.6.5-7.9 kVA/cm2

87. The quantum of heat generated in resistance welding depends upon
A.Welding current alone
B.Time for current current flow alone
C.Area of welding electrode alone
D.None of the above

88. 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

89. 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

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

91. Carbon arc welding is
A.A process which uses a mixture of iron oxide and granular aluminium
B.A process in which arc is maintained under a blanket of flux
C.Used to weld carbon rods
D.None of the above

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