Heat transfer
Previous year question paper with solutions for Heat transfer
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- What is the effect of temperature and pressure on thermal conductivity of gases?
- Explain the significance of diffusivity.
- Write the general one dimension heat conduction equation in cylindrical coordinates.
- Draw the temperature profile curve for heat conducting spherical wall.
- What do you mean by fin efficiency?
- Write the equation for critical thickness of insulation for spherical wall.
- What do you mean by Biot number and Fourier number?
- Why counter flow heat exchanger is more effective than parallel flow heat exchanger?
- What are grey bodies?
- Explain the term fouling factor.
- Differentiate between fin efficiency and fin effectiveness.
- List down the three types of boundary conditions.
- Define Nusselt number and Stanton number.
- Define thermal diffusivity and explain its physical significance.
- How are heat exchangers classified based on flow arrangement?
- Why are the convection and the radiation resistances at a surface in parallel instead of being in series?
- How does the Grashoff number differ from the Reynolds number?
- What is the critical radius of insulation? How is it defined for a cylindrical layer?
- State the Kirchoff’s law of radiation.
- What do you mean by energy balance in heat transfer of IC engines?
- Define thermal conductivity and explain its significance.
- How does transient heat transfer differ from steady state conduction?
- Why extended surfaces are commonly used?
- Under what conditions efficiency of a fin becomes 100%?
- Define laminar and turbulent flows.
- Why a cavity with a small hole does behave as a black body?
- Explain the mechanism of convective heat transfer.
- Explain Stefan Boltzmann’s law.
- What are the limitations of LMTD method?
- What are multi pass heat exchangers?