71. Aluminium is the best material for making patterns because it is
72. In submerged arc welding, an arc is produced between a
73. Rotary swaging
74. When a pattern is made in three parts, the top part, is known as a
75. An oxidising process used for aluminium and magnesium articles is called
76. Cast iron and steel pipes are produced by
77. Which of the following methods can be used for manufacturing 2 meter long seamless metallic tubes?
78. In arc welding, the temperature of heat produced by the electric arc is of the order of
79. The adhesiveness is the property of sand due to which
80. Seam welding is a
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