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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