When the end of a tap is tapered for about three or four threads, it is known as a

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