Heat Transfer Questions

Q.  According to Prevost theory of heat exchange ___________________?

a. it is impossible to transfer heat from low temperature source to t high temperature source
b. heat transfer by radiation requires no medium
c. all bodies above absolute zero emit radiation
d. heat transfer in most of the cases takes place by combination of conduction, convection and radiation
e. rate of heat transfer depends on thermal conductivity and temperature difference


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MCQs:  According of Kirchhoff’s law______________________?
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MCQs:  LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?
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MCQs:  Fourier’s law of heat conduction is valid for_________________?
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MCQs:  In counter flow heat exchangers_________________?
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MCQs:  Joule sec is the unit of_________________?
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MCQs:  According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?
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MCQs:  Total emissivity of polished silver compared to black body is___________________?
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MCQs:  The value of Prandtl number for air is about _______________________?
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MCQs:  The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?
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MCQs:  In free con-vection heat transfer, Nusselt number is function of________________?
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MCQs:  According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to___________________?
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MCQs:  Log mean temperature difference in case of counter flow compared to parallel flow will be________________?
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MCQs:  The unit of Stefan Boltzmann constant is ____________________?
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MCQs:  Stefan Boltzmann law is applicable for heat transfer by __________________?
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MCQs:  Thermal diffusivity of a substance is __________________?
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