64) Log mean temperature difference in case of counter flow compared to parallel flow will be
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more
Related Heat transfer MCQ with Answers
Answer is:
shorter wavelength
67) According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
Answer is:
fourth power of absolute temperature
Explanation:
According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature. Stefan Boltzmann law is applicable for heat transfer by radiation. The unit of Stefan-Boltzman is Watt/m2K4.
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