Previous Year Very Short Questions of HT (B-TECH mechanical engineering 6th)

Heat transfer

Previous year question paper with solutions for Heat transfer

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  1. Define Thermal conductivity. How it is different from apparent thermal conductivity?
  2. What is meant by critical thickness of insulation? How it is calculated in case of cylinder?
  3. Define Stefan Boltzman’s law.
  4. Why thin fins are preferred over a thick fin?
  5. What is the limitation of LMTD method?
  6. Define shape factor of radiation. Calculate all the shape factors of an isosceles vertical triangle.
  7. Define Grashoff Number. What are the forces associated with it?
  8. Define effectiveness and NTU of a heat exchanger.
  9. Define hydrodynamic boundary layer. Which non dimensional number governs the relative magnitude of hydrodynamic and thermal boundary layers?
  10. State Buckingham pi theorem. What are repeating variables, how they are selected?
  11. What is meant by critical thickness of insulation? How it is calculated in case of cylinder?
  12. Define Stefan Boltzman’s law.
  13. Why thin fins are preferred over a thick fin?
  14. What is the limitation of LMTD method?
  15. Define shape factor of radiation. Calculate all the shape factors of an isosceles vertical triangle.
  16. Define Grashoff Number. What are the forces associated with it?
  17. Define effectiveness and NTU of a heat exchanger.
  18. Define hydrodynamic boundary layer. Which non dimensional number governs the relative magnitude of hydrodynamic and thermal boundary layers?
  19. State Buckingham pi theorem. What are repeating variables, how they are selected?
  20. Define Thermal conductivity. What is the effect of temperature on it?
  21. What is meant by critical thickness of insulation? How it is calculated in case of sphere?
  22. Define Kirchoff’s law of radiation.
  23. Why thin fins are preferred over thick fins?
  24. Draw temperature profile of a counter-flow heat exchanger.
  25. What is reciprocity theorem?
  26. Differentiate Nusset number and Biot number.
  27. What is fouling factor of a heat exchanger? Write value for overall heat transfer coefficient considering fouling.
  28. Define Newtonian heating of solids.
  29. Define grey body.