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Mechanical Engineering Objective Questions { Production Technology }



36. 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

37. In arc welding, temperature of the following order may be generated
A.1000C
B.1500C
C.5500C
D.8000C

38. Long arc lengths in welding would require the voltages and currents respectively as follows
A.PRODUCTION TECHNOLOGY
B.(a) high, high
C.(b) low, low
D.(c) high, low

39. Fluxes are used in welding in order to protect the molten metal and the surfaces to be jointed from
A.Oxidation
B.Carburising
C.Dirt
D.Distortion and warping

40. Metal deposited on to the workpiece from the electrode
A.Is forced across the arc
B.Falls because of gravity
C.Is attracted towards the workpiece due to the positive polarity of the workpiece
D.Is attracted towards the workpiece due to the negative polarity of the work-piece

41. In arc welding operations the current value is decided by
A.Thickness of plate
B.Size of the electrode.
C.Voltage across the arc
D.Speed of travel

42. The phenomenon of weld decay occurs in
A.Cast iron
B.Brass
C.Bronze
D.Stainless steel

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