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.
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Related Mcqs:
- Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the_______________?
- A. Hearth of the blast furnace B. Nuclear reactors, missiles & space crafts C. Insulation of high temperature furnaces D. Roof of electric furnaces...
- Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?
- A. 80 and 20 B. 20 and 80 C. 50 and 50 D. 60 and 40...
- Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?
- A. 10 B. 15 C. 20 D. 30...
- Carbon refractories are exclusively used in the_________________?
- A. Hearth of blast furnace B. Walls of coke oven C. Regenerators of coke oven D. Side wall of soaking pits...
- Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material ?
- A. Aluminium phosphate B. Water C. Lime D. Plaster of Paris...
- Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?
- A. Fireclay B. Carborundum C. Graphite D. Chromite...
- Thermal diffusivity of a refractory brick is high, when its ____________ is high?
- A. Density B. Specific heat C. Thermal conductivity D. None of these...
- Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?
- A. Pottery furnace B. Glass melting furnace C. Crucibles D. Gas retorts...
- With increasing alumina content, the fusion point of high alumina refractories__________________?
- A. Increases B. Decreases C. Remain constant D. May increase or decrease; depends on its alumina content...
- Addition of zircon to silica refractory brick improves its_____________________?
- A. Crushing strength B. Resistance to slag attack C. Both A. and B. D. Neither A. nor B....
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