61. The type of file used for a wood work is
62. The increase in hardness due to cold working, is called
63. A mortise gauge is a
64. If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be
65. In electric resistance welding, pressure applied varies from
66. A zinc diffusion process is called
67. The property of sand due to which it evolves a great amount of steam and other gases is called
68. The sand used for making cores is
69. Piercing is an operation of cutting
70. For gas welding, the pressure desired at the welding torch for oxygen is
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