61. The soft grade grinding wheels are denoted by the letters
62. The operation performed on a shaper is
63. A push broach as compared to pull broach
64. The chuck used for setting up of heavy and irregular shaped work should be
65. The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.
66. The average cutting speed for turning brass with a high speed steel tool is
67. The average cutting speed for turning mild steel with a high speed steel tool is
68. The rake angle required to machine brass by high speed steel tool is
69. If the helix angle of the drill is made ________ 30°, then the torque required to drive the drill at a given feed will be more.
70. What is the type of shielding gas for GTAW (Gas Tungsten Arc Welding) used for carbon steels only called?
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