Below 910 Degree Centigrade, pure iron exists in FCC crystal structure.

Between 1537 Degree Centigrade and 1400 Degree Centigrade, iron exists as pearlite.

In the iron-carbon equilibrium diagram the eutectic point is at 6?67% of C.

None of these

to increase red hardness and sustain hardness during tempering

to increase softness and weldability

to promote deoxidisation and nitriding.

to promote grain growth and machinability

To refine grain size and to relieve internal stresses.

To alter electrical and magnetic properties.

To remove gases trapped in the metal during initial casting.

All of the above

Two non-parallel shafts can be run in either direction without any intermediation

A guide pulley helps two non-parallel shafts to run in either direction.

The centre line of the belt when it approaches an idler pulley should be at the edge of the plane.

All of the above

Bluish

Dark red

Dark blue and reddish yellow

White