15 Short Answer Question about Heat Transfer

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Short Type Questions with Answers and Reasons of Heat Transfer

1. What is the reason for the low conductivity of heat insulating materials?
2. When the LMTD (Log Mean Temperature Difference) correction factor used in Heat Exchanger Calculations?
3. Arrange the following in increasing order of Prandtl number.
Glycerol, Mercury, Water and Oxygen.
4. What are the factors on which the the thickness of condensate layer in film wise condensation depend?
5. On what factors does the Shell Side pressure drop in shell and tube heat exchanger depend?
6. Why water is used extensively used as a coolant in Heat Exchange Equipments?
7. What are the main disadvantages of concentric type heat exchangers?
8. Why the outlet temperature of water in an exchanger is not allowed to reach much higher than 500C in normal practice?
9. Why extremely large or small volumes of fluids are best routed through the shell side of a shell and tube heat exchanger?
10. What are the advantages of square pitch arrangement over the triangular pitch in case of heat exchanger tube?
11. What characteristics of the fluid are to be considered while deciding its route in heat exchanger?
12. Suggest suitable materials to be used as medium for high temperature heating?
13. What are the situations for which multiple effect evaporation is not generally recommended?
14. Why is vacuum maintained in vapor space of an evaporator?
15. What type of evaporators are recommended for foamy mixtures?

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