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

C-C composites are structures in which both matrix and the reinforcement are carbon.

C-C composites have high temperature strength and toughness.

The high cost of C-C composites is a major issue.

All of the above