Which is required in an insulating refractory ?

Related Mcqs:

Which one contains maximum percentage of Al2O3 ?

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

Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?

A. Tar bonded dolomite bricks B. Fireclay bricks C. Mullite bricks D. Magnesite bricks...

Spalling resistance of a refractory cannot be increased by ____________________?

A. Increasing its porosity B. Using a coarser grog during its manufacture C. Decreasing its thermal co-efficient of expansion D. Making it denser...

Thoria__________________?

A. Has high fusion temperature (> 3000°C) but poor resistance to thermal shock B. Has high resistance to basic slags C. Which is expensive & radioactive, is used in crucibles for melting high purity metals D. All A., B. and C....

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?

A. Fireclay B. Silicon carbide C. Corundum D. Siliceous fireclay...