Category: Refractory Technology

A. Buckstay
B. Breast wall
C. Armouring
D. Baffle

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

A. 0.5
B. 1
C. 2
D. 3.5

A. Aluminium phosphate
B. Water
C. Lime
D. Plaster of Paris

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. Zirconia
B. Silicon carbide
C. Magnesia
D. None of these

A. Resistance to slag penetration
B. Resistance to CO attack
C. RUL
D. Permanent linear change

A. Dehydrate the dried refractory
B. Develop stable mineral forms in them
C. Form ceramic bonds necessary for development of high crushing strength in the finished
product
D. All A., B. and C.

A. Cristobalite
B. Tridymite
C. Quartz
D. None of these

A. Inner lining of L.D. converter
B. Aluminium melting furnaces
C. Wear out lining of steel melting furnaces
D. All A., and B. and C.