Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?

Related Mcqs:

Which one contains maximum percentage of Al2O3 ?

A. Firebrick B. Sillimanite C. Magnesite D. Aluminous firebrick...

Which is not an alumino-silicate refractory ?

A. Fireclay bricks B. Mullite bricks C. Tar dolomite bricks D. High alumina bricks...

To resist spalling tendency, a refractory should have________________?

A. Greater diffusivity B. Low specific heat C. Low thermal co-efficient of expansion D. All A., B. and C....

Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?

A. High duty fireclay B. Silica C. Mullite D. Carborundum...

Fireclay bricks is not used for lining the__________________?

A. Cupola B. Gas producer C. Bottom of hot metal mixer D. Roof of open hearth furnace...