Related Questions

An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
A L.D. converter
B Blast furnace
C Rotary kiln
D Recuperator
If a refractory contains high content of silicon, it means refractory is
A Acidic
B Basic
C Neutral
D Brittle
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
A Decreases
B Increases
C Remains unchanged
D Increases exponentially
Thermal conductivity of refractory bricks
A Increases with decrease in porosity
B Decreases with decreases in porosity
C Is independent of its porosity and is maximum for insulating bricks
D Increases with the amount of air entrapped in pores
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
A Mortars
B Cements
C Castables
D None of these
Thermal diffusivity of a refractory brick is high, when its __________ is high.
A Density
B Specific heat
C Thermal conductivity
D None of these
Which of the following is not a high alumina refractory material?
A Kyanite
B Sillimanite
C Diaspore
D Periclase
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A $$\frac{1}{{\text{k}}}$$
B k
C k2
D $$\frac{1}{{{{\text{k}}^2}}}$$

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