61. In sheet metal work, he cutting force on the tool can be reduced by
62. The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is
63. In average work, the tolerance produced by investment casting method is
64. In blanking operation, the clearance is provided on
65. In piercing operation, the clearance is provided on
66. The cross-section of a chisel is usually
67. Cores are used to
68. The welding process used to join the ends of two pipes of uniform cross-section, is
69. The consumable electrode is used in
70. During drawing operation, the states of stress in cup would include
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