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Mechanical Engineering Objective Questions { Production Technology }



50. In straight 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

51. In arc welding process the intense heat is developed between the work and the electrode largely due to
A.Current
B.Voltage
C.Electrical energy
D.Contact resistance

52. In thermit welding, he iron oxide and aluminium oxide are mixed in the proportion of
A.1 : 1
B.3 : 1
C.1 : 3
D.Mixture is of different oxides

53. TIG welding is best suited for welding
A.Mild steel
B.Aluminium
C.Carbon steel
D.Silver

54. In the manual TIG welding, the angle of the electrode holder with the direction of welding is ,
A.30
B.45
C.60
D.70

55. Arc stability is better with
A.AC welding
B.DC welding
C.Both AC and DC welding
D.Specially designed wave forms

56. The following welding process uses consumable electrode
A.TIG
B.MIG
C.Thermit
D.Laser

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