81. The metal extrusion process is generally used for producing
82. The flux commonly used in brazing is
83. The centrifugal casting method, is used for casting articles of
84. A casting defect which results in general enlargement of a casting is known as
85. A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as
86. When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as
87. Swab is used for
88. The shrinkage allowance for cast iron pattern is
89. The advantage of thermit welding is that
90. When the dimension is expressed as $$20_{ - 0.025}^{ + 0.035},$$ then the basic size is
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