A. Shape
B. Composition
C. Firing temperature
D. Texture
Related Mcqs:
- Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?
A. 450
B. 250
C. 150
D. 65 - Cold crushing strength of refractories depends upon its_________________?
A. Composition
B. Texture
C. Firing temperature
D. All A., B. and C. - Cold crushing strength of fireclay bricks is about ______________ kgf/cm2?
A. 50-100
B. 100-150
C. 200-400
D. 500-1000 - 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 - Crushing strength of a refractory____________________?
A. Increases with rise in service temperature
B. Decreases with rise in service temperature
C. Is unaffected with change in service temperature
D. Decreases with increase in porosity - ___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?
A. Porosity
B. RUL
C. Specific gravity
D. Thermal conductivity - Spalling resistance of a refractory cannot be increased by ____________________?
A. Increasing its porosity
B. Using a coarser grog during its manufacture
C. Decreasing its thermal co-efficient of expansion
D. Making it denser - Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
A. Tar bonded dolomite bricks
B. Fireclay bricks
C. Mullite bricks
D. Magnesite bricks - Thermal diffusivity of a refractory brick is high, when its ____________ is high?
A. Density
B. Specific heat
C. Thermal conductivity
D. None of these - High alumina refractory compared to fireclay bricks have____________________?
A. Less load bearing capacity
B. Less resistance to slag attack
C. Low refractoriness
D. High resistance to thermal shock and creep
