21) Which is true for electric arc furnace for melting of metals ? 1. Graphite electrodes are used. 2. To produce a tonne of steel, around 400 kWh of electric energy is used. 3. Charge is directly exposed to an electric arc and current in the terminals passes

Answer is:

A, B, C and D

the angle between the cutting edge of the tool and the normal to the direction of velocity of work.

the angle between chip flow direction and the normal to thecutting edge of the tool.

the angle between cutting edge of the tool and normal to the cutting edge.

the angle between chip flow direction and direction of velocity of work.

Answer is:

Answer is:

Answer is:

Answer is: