A. Cost
B. Electrical conductivity
C. Thermal conductivity
D. Fusion point
Related Mcqs:
- Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
A. Silicon carbide
B. Silicon nitride
C. Crystalline magnesia
D. Zirconium sulphate - Maximum alumina content in high alumina refractory can be as high as ____________ percent?
A. 30
B. 50
C. 70
D. 90 - With increase in the alumina content, the refractoriness of high alumina refractories_________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease - The vapor pressure of a substance, at its melting point, is _____________ in the solid state as compared to that in the liquid state?
A. Less
B. More
C. Same
D. Either A. or B.; depends on the nature of the substance - During a phase change process like sublimation, vaporisation, melting etc., the specific ____________ does not change?
A. Enthalpy
B. Gibbs free energy
C. Internal energy
D. Entropy - Thermal diffusivity of a refractory brick is high, when its ______________ is high?
A. Density
B. Specific heat
C. Thermal conductivity
D. None of these - Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of ________________?
A. Fireclay
B. Silicon carbide
C. Corundum
D. Siliceous fireclay - The maximum adiabatic flame temperature of fuels in air is ____________ the maximum flame temperature in pure oxygen?
A. Lower than
B. Higher than
C. Same as
D. Not related to - For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?
A. Sodium chloride
B. Sodium carbonate monohydrate
C. Anhydrous sodium sulphate
D. Hypo - The temperature of a gas in a closed container is 27° C. If the temperature of the gas is increased to 300° C, then the pressure exerted is___________________?
A. Doubled
B. Halved
C. Trebled
D. Unpredictable
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