10 Questions
In a composite wall with three different materials having thermal conductivities $k$, $2k$, and $4k$ respectively, the temperature drop across different materials will be in the ratio
1 : 2 : 4
The thermal diffusivity of a substance is given by
$\frac{\rho c}{k}$
The total emissive power of a blackbody surface is related to its radiation intensity $I$ as
$E = 4\pi I$
For free convection, the Nusselt number is a function of
Prandtl and Grashoff numbers
The characteristic length in Biot number is the ratio of
volume of solid to its surface area
- What is the ratio of temperature drop across the different materials in a composite wall consisting of three different materials with thermal conductivities $k$, $2k$, and $4k$ respectively?
b) 1 : 2 : 4
- How is the thermal diffusivity of a substance expressed?
a) $\frac{\rho c}{k}$
- How is the total emissive power of a blackbody surface related to its radiation intensity $I$?
a) $E = 4\pi I$
- What is the thickness of the thermal boundary layer for a fluid with Prandtl number unity compared to the velocity boundary layer?
b) more than velocity boundary layer
- What are the factors on which the Nusselt number for free convection is dependent?
a) Prandtl and Grashoff numbers
Test your knowledge of heat transfer with this multiple-choice quiz. Challenge yourself with questions on composite walls, thermal conductivities, temperature drops, and thermal diffusivity. Sharpen your understanding of these key concepts in heat transfer.
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