295) A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
Answer is:
2.33
Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers
Answer is:
Watt/m2K4
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.
Answer is:
all of these
Explanation:
The emissive power of a body depends upon its
* temperature
* physical nature
* wave length