B.TECH - Semester 6 heat and mass transfer Question Paper 2020 (sep)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- What are the different modes of heat transfer? State the Fourier's law of heat conduction.
- Explain conduction shape factor and its uses.
- What is thermal diffusivity? Explain its significance.
- Distinguish between fin efficiency and fin effectiveness.
- Define Prandtl number. What is its significance?
- Compare LMTD method and NTU method for heat exchanger analysis.
- Explain Wein's displacement law.
- Consider a hemispherical furnace with flat circular base. Determine the shape factor for radiation from the dome of this furnace to its base.
- Give the analogy between conduction heat transfer and mass diffusion.
- State and explain Fick's law of diffusion. ( $\mathbf{1 0} \boldsymbol{\times} \mathbf{4} \boldsymbol{=} \mathbf{4 0}$ Marks)
- With necessary assumptions derive the general heat conduction equation in cylindrical co-ordinates.
- A cold storage room has walls made of 23 cm of brick on the outerside, 8 cm plastic foam and finally 1.5 cm of wood on the inside. The outside and inside temperature are 22 and $-2^{\circ} \mathrm{C}$ respectively. The inside and outside heat transfe...
- Show by dimensional analysis, Nusselt number is a function of Reynolds number and Prandtl number.
- A counterflow double pipe heat exchanger using superheated steam is used to heat water at the rate of $10000 \mathrm{~kg} / \mathrm{h}$. The steam enters the heat exchanger at $180^{\circ} \mathrm{C}$ and leaves at $130^{\circ} \mathrm{C}$. The inlet...
- Two large parallel plates at temperature 1000 K and 500 K have emissivity of 0.5 and 0.8 respectively. A radiation shield having emissivity 0.1 on one side and 0.05 on the other side is placed between the plates. Calculate the heat transfer by radiat...
- Derive the equation for diffusion mass flow rate in steady state diffusion through a plane membrane. ( $\mathbf{3} \boldsymbol{\times} \mathbf{2 0} \boldsymbol{=} \mathbf{6 0}$ Marks)