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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
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 : 1 : 1
- 1 : 2 : 4 (correct)
- 2 : 4 : 1
- 4 : 2 : 1
The thermal diffusivity of a substance is given by
The thermal diffusivity of a substance is given by
- $\frac{k}{\rho c}$
- $\frac{d}{k\rho}$
- $k c/\rho$
- $\frac{\rho c}{k}$ (correct)
The total emissive power of a blackbody surface is related to its radiation intensity $I$ as
The total emissive power of a blackbody surface is related to its radiation intensity $I$ as
- $E = 4\pi I$ (correct)
- $E = \pi I$
- $E = \pi^2 I$
- $E = 2\pi I$
For free convection, the Nusselt number is a function of
For free convection, the Nusselt number is a function of
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The characteristic length in Biot number is the ratio of
The characteristic length in Biot number is the ratio of
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- 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?
- 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?
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- How is the thermal diffusivity of a substance expressed?
- How is the thermal diffusivity of a substance expressed?
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- How is the total emissive power of a blackbody surface related to its radiation intensity $I$?
- How is the total emissive power of a blackbody surface related to its radiation intensity $I$?
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- What is the thickness of the thermal boundary layer for a fluid with Prandtl number unity compared to the velocity boundary layer?
- What is the thickness of the thermal boundary layer for a fluid with Prandtl number unity compared to the velocity boundary layer?
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- What are the factors on which the Nusselt number for free convection is dependent?
- What are the factors on which the Nusselt number for free convection is dependent?
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