71.
The width of cutting edge of a parting off tool varies from

72.
A twist drill is a

74.
In ultrasonic machining, tool is made of

75.
In hot machining, tool is made of

76.
In electro discharge machining, tool is made of

77.
In a gating system, the ratio 1 : 2 : 4 represents

78.
The vector sum of cutting velocity and chip velocity is __________ shear velocity.

79.
The increase in depth of cut and feed rate _________ surface finish.

80.
Larger end cutting edge angle _________ tool life.

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