List of top Nano Technology Questions on Heat Transfer asked in AP PGECET

A plane wall of thickness $0.1\text{ m}$ and thermal conductivity $50\text{ W/m}\cdot\text{K}$ has a surface area of $2\text{ m}^2$. The temperature difference across the wall is $100\text{ K}$. What is the rate of heat transfer through the wall?

Which of the following has the highest thermal diffusivity:

A surface with emissivity 0.8 and area $1\text{ m}^2$ is maintained at $500\text{ K}$ and is surrounded by air at $300\text{ K}$. Given Stefan–Boltzmann constant $\sigma = 5.67 \times 10^{-8}\text{ W/m}^2\text{K}^4$. What is the rate of radiative heat transfer?

Thermal diffusivity is a