Refractory Technology

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., B. and C.

A. Mortars
B. Cements
C. Castables
D. None of these

A. Composite material containing both ceramic & metallic constituents
B. Having high strength & resistance to high temperature
C. Used in space vehicles, missiles & nuclear energy plants
D. All A., B. and C.

A. Greater diffusivity
B. Low specific heat
C. Low thermal co-efficient of expansion
D. All A., B. and C.

A. High spalling resistance
B. Low spalling resistance
C. High resistance to fusion
D. Low porosity

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. High refractoriness
B. High resistance to spalling
C. High strength and density
D. All A., B. and C.

A. Composition
B. Texture
C. Firing temperature
D. All A., B. and C.