When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as

The carbide tools operating at very low cutting speeds (below 30 m/min)

A. Reduces tool life

B. Increases tool life

C. Have no effect on tool life

D. Spoils the work piece

The type of reamer used for reaming operation in a blind hole, is

A. Straight fluted reamer

B. Left hand spiral fluted reamer

C. Right hand spiral fluted reamer

D. Any one of these

Stellite preserves hardness up to a temperature of

A. 350°C

B. 500°C

C. 900°C

D. 1100°C

High speed steel tools retain their hardness up to a temperature of

A. 250°C

B. 350°C

C. 500°C

D. 900°C