Related Questions

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
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 a conducting solid material depends upon its
A Temperature
B Porosity
C Both A & B
D Neither A nor B
The thermal stress in a metallic bar does not depend upon the
A Changes in temperature
B Cross-sectional area
C Both A & B
D Neither A nor B
Grindability of a material does not depend upon its
A Elasticity
B Hardness
C Toughness
D Size
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A $$\frac{1}{{\text{k}}}$$
B k
C k2
D $$\frac{1}{{{{\text{k}}^2}}}$$
High thermal conductivity of a refractory material is not important, when it is to be used in the
A Coke oven regenarators
B Muffle furnace
C Blast furnace
D Recuperators
Thermal conductivity of a material may be defined as the
A Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C
B Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
C Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
D All of the above
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.
A Parabolic
B Hyperbolic
C Linear
D Logarithmic
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.
A Hyperbolic
B Parabolic
C Linear
D Logarithmic

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