- (A) Decreased viscosity of slag
- (B) Increased thermal conductivity of brick
- (C) Oxidising condition in the furnace
- (D) None of these
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- (A) Pottery furnace
- (B) Glass melting furnace
- (C) Crucibles
- (D) Gas retorts
- (A) 50-100
- (B) 100-150
- (C) 200-400
- (D) 500-1000
- (A) Basic Bessemer converter
- (B) Basic open hearth furnace
- (C) Electric furnaces
- (D) All
- (A) Fireclay
- (B) Silica
- (C) Chrome magnesite
- (D) None of these
- (A) Attack by basic slag
- (B) Abrasion
- (C) Disintegration on sudden change of temperature
- (D) Both
- (A) Very high thermal conductivity
- (B) High co-efficient of expansion upto this temperature
- (C) High thermal diffusivity
- (D) Low refractoriness
- (A) CaO
- (B) MgO
- (C) Al2O3
- (D) SiO2
- (A) Very high temperatures are involved
- (B) Highly reducing conditions are involved
- (C) Presence of iron or silica is harmful
- (D) All
- (A) Porosity
- (B) Specific gravity
- (C) Thermal conductivity
- (D) Strength
