Ceramic coating material for furnace refractory, which increases its e – McqOptions

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1.	Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of$?
A.	Graphite powder
B.	Thoria
C.	Zircon powder
D.	Beryllium
Answer» D. Beryllium

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