Distortion & Residual Stresses
73. Lack of penetration in a butt welded joint is due to…
A. too low welding speed   
B. short arc length   
C. high current   
D. low current

74.Which type of distortion can be controlled by presenting of plates to be welded?
A. angular distortion   
B. transverse distortion   
C. longitudinal distortion   
D. distortion due to locked-up stresses

75. What is the percentage carbon present in mild steel?
A. 0.05 to 0.1%   
B. 0.15 to 0.3%   
C. 0.5 to 0.8%   
D. 0.8 to 1.4%

76. If a high carbon steel plate is heated to above its higher critical temperature and then suddenly cooled, it will become…
A. annealed    
B. tempered   
C. hardened   
D. normalized

77. Residual stresses present in a welded job will
A. increase hardness of the weld   
B. decrease ductility of the weld   
C. crack the joint when load is applied
D. increase the life of a welded joint

78. Which one of the following metal has highest thermal conductivity?
A. zinc   
B. copper    
C. mild steel   
D. aluminium

79. Which one of the following metal has the highest melting temperature?
A. copper   
B. tungsten   
C. aluminium   
D. mild steel

80. Which one of the below given welding machines can be used for both AC and DC welding?
A. engine driven welding generator   
B. motor driven welding generator   
C. welding transformer 
D. welding rectifier

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