Refractory Technology MCQ Questions & Answers | Chemical Engineering

A. Poor resistance to the peneration of molten slag, metal & flue gases

B. Poor heat conductivity & low strength

C. Better thermal spalling resistance

D. All of the above

A. Mullite

B. Corrundum

C. Bauxite

D. Dolomite

A. Graphite

B. Fireclay

C. Alumina

D. Zircon

A. Crystalline form of MgO

B. MgCO₃

C. ZrSO₄

D. Amorphous magnesite

A. Refractories used in muffle furnace should have low thermal conductivity

B. The electrical resistivity of refractories drops rapidly with rise in temperature

C. For reducing spalling tendency, the refractory should be well fired and its porosity should be more

D. Refractoriness under load (RUL) of a refractory is always less than its refractoriness

A. Stable form of silica upto 870°C

B. Converted to tridymite on firing between 870 to 1470°C

C. Transformed to crystoballite on heating above 1470°C

D. All of the above

A. Producing monolithic linings

B. Patch work

C. Minimising the number of joints in the structure

D. All of the above

A. Pottery furnace

B. Glass melting furnace

C. Crucibles

D. Gas retorts

A. Obtaining monolithic working faces

B. Repairing construction of various furnace parts

C. Both A & B

D. Neither A nor B

A. Exihibit wetting characteristics

B. Should be used in neutral or reducing atmosphere

C. Exhibit high shrinkage on thermal treatment

D. Are not resistant to corrosion by slag