____________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?

Related Mcqs:

Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about ______________ percent?

A. 5 B. 20 C. 35 D. 55...

Which is not a basic refractory ?

A. Chrome magnesite B. Magnesite C. Dolomite D. Silicon carbide...

Pyrometric cone equivalent (PCE) value (Segar cone) of ‘Superduty refractories’ is more than 33 which corresponds to a temperature of _____________ °C?

A. 1520 B. 1630 C. 1670 D. 1730...

Carbon refractories_____________________?

A. Do not burn/oxidise, when exposed to air on heating B. Are not attacked by slags, as they are not wetted by melts C. Do not resist temperature fluctuations D. Have extremely low thermal & electrical conductivities...

Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?

A. Beryllia B. Carborundum C. Corundum D. Thoria...