An active device and converts mechanical displacement into change of resistance

A passive device and converts mechanical displacement into change of resistance.

A passive device and converts electrical displacement into change of resistance

An active device and converts electrical displacement into change of resistance.

A and D only

C and D only

B only

D only

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